chore: refactor python tests to use unittest (#2414)

Move every test to a method on DenoTestCase.
test.py is a single TestSuite of every TestCase.

Add a Spawn context manager for http_server,
this is explicitly used where it's needed.
Each python test file can now be run independently
without needing to manually run http_server.

Add --help and consistent flags using argparse for
each python test, including --failfast.

Use ColorTextTestRunner so that '... ok' is green.

.appveyor.yml

@@ -196,7 +196,7 @@ build_script:
 test_script:
   - python tools\lint.py
   - python tools\test_format.py
-  - ps: Exec { & python tools\test.py $env:DENO_BUILD_PATH }
+  - ps: Exec { & python tools\test.py -v $env:DENO_BUILD_PATH }
 
 after_test:
   # Delete the the rollup cache, which is unreliable, so that it doesn't get

.travis.yml

@@ -73,7 +73,7 @@ script:
 - ./tools/lint.py
 - ./tools/test_format.py
 - ./tools/build.py -C target/release
-- DENO_BUILD_MODE=release ./tools/test.py
+- DENO_BUILD_MODE=release ./tools/test.py -v
 
 jobs:
   fast_finish: true

tools/benchmark_test.py

@@ -3,11 +3,14 @@
 import sys
 import os
 import benchmark
-from util import build_path, executable_suffix
+import unittest
+from util import DenoTestCase, test_main
 
 
-def strace_parse_test():
+class TestBenchmark(DenoTestCase):
-    with open(os.path.join(sys.path[0], "testdata/strace_summary.out"),
+    def test_strace_parse(self):
+        with open(
+                os.path.join(sys.path[0], "testdata/strace_summary.out"),
                 "r") as f:
             summary = benchmark.strace_parse(f.read())
             # first syscall line
@@ -21,24 +24,23 @@ def strace_parse_test():
             # summary line
             assert summary["total"]["calls"] == 704
 
-
+    def test_max_mem_parse(self):
-def max_mem_parse_test():
         with open(os.path.join(sys.path[0], "testdata/time.out"), "r") as f:
             data = f.read()
             assert benchmark.find_max_mem_in_bytes(data) == 120380 * 1024
 
-
+    def test_binary_size(self):
-def binary_size_test(build_dir):
+        binary_size_dict = benchmark.get_binary_sizes(self.build_dir)
-    binary_size_dict = benchmark.get_binary_sizes(build_dir)
         assert binary_size_dict["deno"] > 0
         assert binary_size_dict["main.js"] > 0
         assert binary_size_dict["main.js.map"] > 0
         assert binary_size_dict["snapshot_deno.bin"] > 0
 
-
+    @unittest.skipIf("linux" not in sys.platform,
-def strace_test(deno_path):
+                     "strace only supported on linux")
+    def test_strace(self):
         new_data = {}
-    benchmark.run_strace_benchmarks(deno_path, new_data)
+        benchmark.run_strace_benchmarks(self.deno_exe, new_data)
         assert "thread_count" in new_data
         assert "syscall_count" in new_data
 
@@ -51,26 +53,7 @@ def strace_test(deno_path):
         assert s["hello"] > 1
 
 
-def benchmark_test(build_dir, deno_path):
-    strace_parse_test()
-    binary_size_test(build_dir)
-    max_mem_parse_test()
-    if "linux" in sys.platform:
-        strace_test(deno_path)
-
-
-# This test assumes tools/http_server.py is running in the background.
-def main():
-    if len(sys.argv) == 2:
-        build_dir = sys.argv[1]
-    elif len(sys.argv) == 1:
-        build_dir = build_path()
-    else:
-        print "Usage: tools/benchmark_test.py [build_dir]"
-        sys.exit(1)
-    deno_exe = os.path.join(build_dir, "deno" + executable_suffix)
-    benchmark_test(build_dir, deno_exe)
-
-
 if __name__ == '__main__':
-    main()
+    # FIME this doesn't appear to be the case.
+    # This test assumes tools/http_server.py is running in the background.
+    test_main()

tools/complex_permissions_test.py

@@ -2,15 +2,13 @@
 # -*- coding: utf-8 -*-
 # Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import os
-import pty
-import select
 import subprocess
 import sys
 import time
 import unittest
 
-import http_server
+from http_server import spawn
-from util import build_path, root_path, executable_suffix, green_ok, red_failed
+from util import DenoTestCase, root_path, test_main, tty_capture
 
 PERMISSIONS_PROMPT_TEST_TS = "tools/complex_permissions_test.ts"
 
@@ -18,47 +16,8 @@ PROMPT_PATTERN = b'⚠️'
 PERMISSION_DENIED_PATTERN = b'PermissionDenied: permission denied'
 
 
-# This function is copied from:
+@unittest.skipIf(os.name == 'nt', "Unable to test tty on Windows")
-# https://gist.github.com/hayd/4f46a68fc697ba8888a7b517a414583e
+class BaseComplexPermissionTest(DenoTestCase):
-# https://stackoverflow.com/q/52954248/1240268
-def tty_capture(cmd, bytes_input, timeout=5):
-    """Capture the output of cmd with bytes_input to stdin,
-    with stdin, stdout and stderr as TTYs."""
-    mo, so = pty.openpty()  # provide tty to enable line-buffering
-    me, se = pty.openpty()
-    mi, si = pty.openpty()
-    fdmap = {mo: 'stdout', me: 'stderr', mi: 'stdin'}
-
-    timeout_exact = time.time() + timeout
-    p = subprocess.Popen(
-        cmd, bufsize=1, stdin=si, stdout=so, stderr=se, close_fds=True)
-    os.write(mi, bytes_input)
-
-    select_timeout = .04  #seconds
-    res = {'stdout': b'', 'stderr': b''}
-    while True:
-        ready, _, _ = select.select([mo, me], [], [], select_timeout)
-        if ready:
-            for fd in ready:
-                data = os.read(fd, 512)
-                if not data:
-                    break
-                res[fdmap[fd]] += data
-        elif p.poll() is not None or time.time(
-        ) > timeout_exact:  # select timed-out
-            break  # p exited
-    for fd in [si, so, se, mi, mo, me]:
-        os.close(fd)  # can't do it sooner: it leads to errno.EIO error
-    p.wait()
-    return p.returncode, res['stdout'], res['stderr']
-
-
-class ComplexPermissionTestCase(unittest.TestCase):
-    def __init__(self, method_name, test_type, deno_exe):
-        super(ComplexPermissionTestCase, self).__init__(method_name)
-        self.test_type = test_type
-        self.deno_exe = deno_exe
-
     def _run_deno(self, flags, args):
         "Returns (return_code, stdout, stderr)."
         cmd = ([self.deno_exe, "run", "--no-prompt"] + flags +
@@ -66,7 +25,9 @@ class ComplexPermissionTestCase(unittest.TestCase):
         return tty_capture(cmd, b'')
 
 
-class TestReadWritePermissions(ComplexPermissionTestCase):
+class TestReadPermissions(BaseComplexPermissionTest):
+    test_type = "read"
+
     def test_inside_project_dir(self):
         code, _stdout, stderr = self._run_deno(
             ["--allow-" + self.test_type + "=" + root_path],
@@ -136,7 +97,13 @@ class TestReadWritePermissions(ComplexPermissionTestCase):
         os.chdir(saved_curdir)
 
 
-class TestNetFetchPermissions(ComplexPermissionTestCase):
+class TestWritePermissions(TestReadPermissions):
+    test_type = "write"
+
+
+class TestNetFetchPermissions(BaseComplexPermissionTest):
+    test_type = "net_fetch"
+
     def test_allow_localhost_4545(self):
         code, _stdout, stderr = self._run_deno(
             ["--allow-net=localhost:4545"],
@@ -171,7 +138,9 @@ class TestNetFetchPermissions(ComplexPermissionTestCase):
         assert not PERMISSION_DENIED_PATTERN in stderr
 
 
-class TestNetDialPermissions(ComplexPermissionTestCase):
+class TestNetDialPermissions(BaseComplexPermissionTest):
+    test_type = "net_dial"
+
     def test_allow_localhost_ip_4555(self):
         code, _stdout, stderr = self._run_deno(
             ["--allow-net=127.0.0.1:4545"], [self.test_type, "127.0.0.1:4545"])
@@ -203,7 +172,9 @@ class TestNetDialPermissions(ComplexPermissionTestCase):
         assert not PERMISSION_DENIED_PATTERN in stderr
 
 
-class TestNetListenPermissions(ComplexPermissionTestCase):
+class TestNetListenPermissions(BaseComplexPermissionTest):
+    test_type = "net_listen"
+
     def test_allow_localhost_4555(self):
         code, _stdout, stderr = self._run_deno(
             ["--allow-net=localhost:4555"], [self.test_type, "localhost:4555"])
@@ -235,36 +206,10 @@ class TestNetListenPermissions(ComplexPermissionTestCase):
         assert not PERMISSION_DENIED_PATTERN in stderr
 
 
-def complex_permissions_test(deno_exe):
+def complex_permissions_tests():
-    runner = unittest.TextTestRunner(verbosity=2)
+    return BaseComplexPermissionTest.__subclasses__()
-    loader = unittest.TestLoader()
-
-    tests = (
-        ("read", TestReadWritePermissions),
-        ("write", TestReadWritePermissions),
-        ("net_fetch", TestNetFetchPermissions),
-        ("net_dial", TestNetDialPermissions),
-        ("net_listen", TestNetListenPermissions),
-    )
-
-    for (test_type, test_class) in tests:
-        print "Complex permissions tests for \"{}\"".format(test_type)
-
-        test_names = loader.getTestCaseNames(test_class)
-        suite = unittest.TestSuite()
-        for test_name in test_names:
-            suite.addTest(test_class(test_name, test_type, deno_exe))
-
-        result = runner.run(suite)
-        if not result.wasSuccessful():
-            sys.exit(1)
-
-
-def main():
-    deno_exe = os.path.join(build_path(), "deno" + executable_suffix)
-    http_server.spawn()
-    complex_permissions_test(deno_exe)
 
 
 if __name__ == "__main__":
-    main()
+    with spawn():
+        test_main()

tools/deno_dir_test.py

@@ -5,50 +5,42 @@
 import os
 import subprocess
 import sys
-from util import rmtree, run
+
+from util import DenoTestCase, mkdtemp, rmtree, run, test_main
 
 
-def deno_dir_test(deno_exe, deno_dir):
+class TestDenoDir(DenoTestCase):
-    assert os.path.isfile(deno_exe)
+    def setUp(self):
-
+        self.old_deno_dir = None
-    old_deno_dir = None
         if "DENO_DIR" in os.environ:
-        old_deno_dir = os.environ["DENO_DIR"]
+            self.old_deno_dir = os.environ["DENO_DIR"]
             del os.environ["DENO_DIR"]
 
+    def tearDown(self):
+        if self.old_deno_dir is not None:
+            os.environ["DENO_DIR"] = self.old_deno_dir
+
+    def test_deno_dir(self):
+        deno_dir = mkdtemp()
         if os.path.isdir(deno_dir):
             rmtree(deno_dir)
 
         # Run deno with no env flag
-    run_deno(deno_exe)
+        self.run_deno()
         assert not os.path.isdir(deno_dir)
 
         # Run deno with DENO_DIR env flag
-    run_deno(deno_exe, deno_dir)
+        self.run_deno(deno_dir)
         assert os.path.isdir(deno_dir)
         assert os.path.isdir(os.path.join(deno_dir, "deps"))
         assert os.path.isdir(os.path.join(deno_dir, "gen"))
         rmtree(deno_dir)
 
-    if old_deno_dir is not None:
+    def run_deno(self, deno_dir=None):
-        os.environ["DENO_DIR"] = old_deno_dir
+        cmd = [self.deno_exe, "run", "tests/002_hello.ts"]
-
-
-def run_deno(deno_exe, deno_dir=None):
-    cmd = [deno_exe, "run", "tests/002_hello.ts"]
         deno_dir_env = {"DENO_DIR": deno_dir} if deno_dir is not None else None
         run(cmd, quiet=True, env=deno_dir_env)
 
 
-USAGE = "./tools/deno_dir_test.py target/debug/deno target/debug/.deno_dir"
-
-
-def main(argv):
-    if len(sys.argv) != 3:
-        print "Usage: " + USAGE
-        sys.exit(1)
-    deno_dir_test(argv[1], argv[2])
-
-
 if __name__ == '__main__':
-    sys.exit(main(sys.argv))
+    test_main()

tools/fetch_test.py

@@ -2,29 +2,29 @@
 # Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import os
 import sys
-from util import mkdtemp, tests_path, run_output, green_ok
 import shutil
 
+from http_server import spawn
+from util import DenoTestCase, mkdtemp, tests_path, run_output, test_main
 
-def fetch_test(deno_exe):
-    sys.stdout.write("fetch_test...")
-    sys.stdout.flush()
 
+class FetchTest(DenoTestCase):
+    def test_fetch(self):
         deno_dir = mkdtemp()
         try:
             t = os.path.join(tests_path, "006_url_imports.ts")
-        output = run_output([deno_exe, "fetch", t],
+            output = run_output([self.deno_exe, "fetch", t],
                                 merge_env={"DENO_DIR": deno_dir})
             assert output == ""
             # Check that we actually did the prefetch.
             os.path.exists(
-            os.path.join(deno_dir,
+                os.path.join(
+                    deno_dir,
                     "deps/http/localhost_PORT4545/tests/subdir/mod2.ts"))
         finally:
             shutil.rmtree(deno_dir)
 
-    print green_ok()
-
 
 if __name__ == "__main__":
-    fetch_test(sys.argv[1])
+    with spawn():
+        test_main()

tools/fmt_test.py

@@ -1,47 +1,46 @@
 #!/usr/bin/env python
 # Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-import os
-import sys
-from util import mkdtemp, root_path, tests_path, run, green_ok
-import shutil
 import json
+import os
+import shutil
+import sys
+
+from util import (DenoTestCase, mkdtemp, root_path, tests_path, run, test_main)
 
 
-def fmt_test(deno_exe):
+class FmtTest(DenoTestCase):
-    sys.stdout.write("fmt_test...")
+    def test_fmt(self):
-    sys.stdout.flush()
         d = mkdtemp()
         try:
-        fixed_filename = os.path.join(tests_path, "badly_formatted_fixed.js")
+            fixed_filename = os.path.join(tests_path,
+                                          "badly_formatted_fixed.js")
             src = os.path.join(tests_path, "badly_formatted.js")
             dst = os.path.join(d, "badly_formatted.js")
             shutil.copyfile(src, dst)
-        # Set DENO_DIR to the temp dir so we test an initial fetch of prettier.
+
+            # Set DENO_DIR to the temp dir to test an initial fetch of prettier.
             # TODO(ry) This make the test depend on internet access which is not
             # ideal. We should have prettier in the repo already, and we could
             # fetch it instead through tools/http_server.py.
             deno_dir = d
 
-        # TODO(kt3k) The below line should be run([deno_exe, "fmt", dst], ...)
+            # TODO(kt3k) Below can be run([deno_exe, "fmt", dst], ...)
-        # It should be updated when the below issue is addressed
+            # once the following issue is addressed:
             # https://github.com/denoland/deno_std/issues/330
-        run([os.path.join(root_path, deno_exe), "fmt", "badly_formatted.js"],
+            run([
+                os.path.join(root_path, self.deno_exe), "fmt",
+                "badly_formatted.js"
+            ],
                 cwd=d,
                 merge_env={"DENO_DIR": deno_dir})
             with open(fixed_filename) as f:
                 expected = f.read()
             with open(dst) as f:
                 actual = f.read()
-        if expected != actual:
+            self.assertEqual(expected, actual)
-            print "Expected didn't match actual."
-            print "expected: ", json.dumps(expected)
-            print "actual: ", json.dumps(actual)
-            sys.exit(1)
-
         finally:
             shutil.rmtree(d)
-    print green_ok()
 
 
 if __name__ == "__main__":
-    fmt_test(sys.argv[1])
+    test_main()

tools/http_server.py

@@ -2,13 +2,15 @@
 # Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 # Many tests expect there to be an http server on port 4545 servering the deno
 # root directory.
+from collections import namedtuple
+from contextlib import contextmanager
 import os
-import sys
-from threading import Thread
 import SimpleHTTPServer
 import SocketServer
-from util import root_path
+import sys
 from time import sleep
+from threading import Thread
+from util import root_path
 
 PORT = 4545
 REDIRECT_PORT = 4546
@@ -87,6 +89,9 @@ class ContentTypeHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
         return SimpleHTTPServer.SimpleHTTPRequestHandler.guess_type(self, path)
 
 
+RunningServer = namedtuple("RunningServer", ["server", "thread"])
+
+
 def server():
     os.chdir(root_path)  # Hopefully the main thread doesn't also chdir.
     Handler = ContentTypeHandler
@@ -98,7 +103,7 @@ def server():
     SocketServer.TCPServer.allow_reuse_address = True
     s = SocketServer.TCPServer(("", PORT), Handler)
     print "Deno test server http://localhost:%d/" % PORT
-    return s
+    return RunningServer(s, start(s))
 
 
 def base_redirect_server(host_port, target_port, extra_path_segment=""):
@@ -117,7 +122,7 @@ def base_redirect_server(host_port, target_port, extra_path_segment=""):
     s = SocketServer.TCPServer(("", host_port), Handler)
     print "redirect server http://localhost:%d/ -> http://localhost:%d/" % (
         host_port, target_port)
-    return s
+    return RunningServer(s, start(s))
 
 
 # redirect server
@@ -137,35 +142,30 @@ def double_redirects_server():
     return base_redirect_server(DOUBLE_REDIRECTS_PORT, REDIRECT_PORT)
 
 
-def spawn():
+def start(s):
-    # Main http server
+    thread = Thread(target=s.serve_forever, kwargs={"poll_interval": 0.05})
-    s = server()
-    thread = Thread(target=s.serve_forever)
     thread.daemon = True
     thread.start()
-    # Redirect server
-    rs = redirect_server()
-    r_thread = Thread(target=rs.serve_forever)
-    r_thread.daemon = True
-    r_thread.start()
-    # Another redirect server
-    ars = another_redirect_server()
-    ar_thread = Thread(target=ars.serve_forever)
-    ar_thread.daemon = True
-    ar_thread.start()
-    # Double redirects server
-    drs = double_redirects_server()
-    dr_thread = Thread(target=drs.serve_forever)
-    dr_thread.daemon = True
-    dr_thread.start()
-    sleep(1)  # TODO I'm too lazy to figure out how to do this properly.
     return thread
 
 
-def main():
+@contextmanager
+def spawn():
+    servers = (server(), redirect_server(), another_redirect_server(),
+               double_redirects_server())
+    sleep(1)  # TODO I'm too lazy to figure out how to do this properly.
     try:
-        thread = spawn()
+        yield
-        while thread.is_alive():
+    finally:
+        for s in servers:
+            s.server.shutdown()
+
+
+def main():
+    servers = (server(), redirect_server(), another_redirect_server(),
+               double_redirects_server())
+    try:
+        while all(s.thread.is_alive() for s in servers):
             sleep(10)
     except KeyboardInterrupt:
         pass

tools/integration_tests.py

@@ -7,14 +7,16 @@
 # exit code can be specified.
 #
 # Usage: integration_tests.py [path to deno executable]
+import argparse
 import os
 import re
 import sys
 import subprocess
-import http_server
+import unittest
-import argparse
+
-from util import root_path, tests_path, pattern_match, \
+from http_server import spawn
-                 green_ok, red_failed, rmtree, executable_suffix
+from util import (DenoTestCase, ColorTextTestRunner, root_path, tests_path,
+                  pattern_match, rmtree, test_main)
 
 
 def strip_ansi_codes(s):
@@ -45,38 +47,29 @@ def str2bool(v):
         raise ValueError("Bad boolean value")
 
 
-def integration_tests(deno_exe, test_filter=None):
+class TestIntegrations(DenoTestCase):
-    assert os.path.isfile(deno_exe)
+    @classmethod
-    tests = sorted([
+    def _test(cls, test_filename):
-        filename for filename in os.listdir(tests_path)
+        # Return thunk to test for js file,
-        if filename.endswith(".test")
+        # This is to 'trick' unittest so as to generate these dynamically.
-    ])
+        return lambda self: self.generate(test_filename)
-    assert len(tests) > 0
-    for test_filename in tests:
-        if test_filter and test_filter not in test_filename:
-            continue
 
+    def generate(self, test_filename):
         test_abs = os.path.join(tests_path, test_filename)
         test = read_test(test_abs)
         exit_code = int(test.get("exit_code", 0))
         args = test.get("args", "").split(" ")
-
         check_stderr = str2bool(test.get("check_stderr", "false"))
-
         stderr = subprocess.STDOUT if check_stderr else open(os.devnull, 'w')
-
         stdin_input = (test.get("input",
                                 "").strip().decode("string_escape").replace(
                                     "\r\n", "\n"))
-
         has_stdin_input = len(stdin_input) > 0
 
         output_abs = os.path.join(root_path, test.get("output", ""))
         with open(output_abs, 'r') as f:
             expected_out = f.read()
-        cmd = [deno_exe] + args
+        cmd = [self.deno_exe] + args
-        sys.stdout.write("tests/%s ... " % (test_filename))
-        sys.stdout.flush()
         actual_code = 0
         try:
             if has_stdin_input:
@@ -97,23 +90,22 @@ def integration_tests(deno_exe, test_filter=None):
             actual_code = e.returncode
             actual_out = e.output
 
-        if exit_code != actual_code:
+        self.assertEqual(exit_code, actual_code)
-            print "... " + red_failed()
-            print "Expected exit code %d but got %d" % (exit_code, actual_code)
-            print "Output:"
-            print actual_out
-            sys.exit(1)
 
         actual_out = strip_ansi_codes(actual_out)
+        if not pattern_match(expected_out, actual_out):
+            # This will always throw since pattern_match failed.
+            self.assertEqual(expected_out, actual_out)
 
-        if pattern_match(expected_out, actual_out) != True:
-            print red_failed()
-            print "Expected output does not match actual."
-            print "Expected output: \n" + expected_out
-            print "Actual output:   \n" + actual_out
-            sys.exit(1)
 
-        print green_ok()
+# Add a methods for each test file in tests_path.
+for fn in sorted(
+        filename for filename in os.listdir(tests_path)
+        if filename.endswith(".test")):
+
+    t = TestIntegrations._test(fn)
+    tn = t.__name__ = "test_" + fn.split(".")[0]
+    setattr(TestIntegrations, tn, t)
 
 
 def main():
@@ -125,26 +117,26 @@ def main():
     args = parser.parse_args()
 
     target = "release" if args.release else "debug"
-
+    build_dir = os.environ.get("DENO_BUILD_PATH",
-    build_dir = None
+                               os.path.join(root_path, "target", target))
-    if "DENO_BUILD_PATH" in os.environ:
-        build_dir = os.environ["DENO_BUILD_PATH"]
-    else:
-        build_dir = os.path.join(root_path, "target", target)
 
     deno_dir = os.path.join(build_dir, ".deno_test")
     if os.path.isdir(deno_dir):
         rmtree(deno_dir)
     os.environ["DENO_DIR"] = deno_dir
 
-    deno_exe = os.path.join(build_dir, "deno" + executable_suffix)
+    test_names = [
-    if args.executable:
+        test_name for test_name in unittest.TestLoader().getTestCaseNames(
-        deno_exe = args.executable
+            TestIntegrations) if not args.filter or args.filter in test_name
+    ]
+    suite = unittest.TestLoader().loadTestsFromNames(
+        test_names, module=TestIntegrations)
 
-    http_server.spawn()
+    with spawn():
-
+        result = ColorTextTestRunner(verbosity=2).run(suite)
-    integration_tests(deno_exe, args.filter)
+        if not result.wasSuccessful():
+            sys.exit(1)
 
 
 if __name__ == "__main__":
-    sys.exit(main())
+    main()

tools/is_tty_test.py

@@ -1,27 +1,23 @@
 #!/usr/bin/env python
 # Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import os
-import pty
-import select
 import subprocess
-from util import build_path, executable_suffix
+import unittest
 from sys import stdin
-from permission_prompt_test import tty_capture
+
+from util import DenoTestCase, test_main, tty_capture
 
 IS_TTY_TEST_TS = "tests/is_tty.ts"
 
 
-def is_tty_test(deno_exe):
+@unittest.skipIf(os.name == 'nt', "Unable to test tty on Windows")
-    cmd = [deno_exe, "run", IS_TTY_TEST_TS]
+class TestIsTty(DenoTestCase):
+    def test_is_tty(self):
+        cmd = [self.deno_exe, "run", IS_TTY_TEST_TS]
         code, stdout, _ = tty_capture(cmd, b'')
         assert code == 0
         assert str(stdin.isatty()).lower() in stdout
 
 
-def main():
-    deno_exe = os.path.join(build_path(), "deno" + executable_suffix)
-    is_tty_test(deno_exe)
-
-
 if __name__ == "__main__":
-    main()
+    test_main()

tools/permission_prompt_test.py

@@ -2,14 +2,12 @@
 # -*- coding: utf-8 -*-
 # Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import os
-import pty
-import select
 import subprocess
 import sys
 import time
 import unittest
 
-from util import build_path, executable_suffix, green_ok, red_failed
+from util import DenoTestCase, test_main, tty_capture
 
 PERMISSIONS_PROMPT_TEST_TS = "tools/permission_prompt_test.ts"
 
@@ -18,47 +16,8 @@ FIRST_CHECK_FAILED_PATTERN = b'First check failed'
 PERMISSION_DENIED_PATTERN = b'PermissionDenied: permission denied'
 
 
-# This function is copied from:
+@unittest.skipIf(os.name == 'nt', "Unable to test tty on Windows")
-# https://gist.github.com/hayd/4f46a68fc697ba8888a7b517a414583e
+class BasePromptTest(object):
-# https://stackoverflow.com/q/52954248/1240268
-def tty_capture(cmd, bytes_input, timeout=5):
-    """Capture the output of cmd with bytes_input to stdin,
-    with stdin, stdout and stderr as TTYs."""
-    mo, so = pty.openpty()  # provide tty to enable line-buffering
-    me, se = pty.openpty()
-    mi, si = pty.openpty()
-    fdmap = {mo: 'stdout', me: 'stderr', mi: 'stdin'}
-
-    timeout_exact = time.time() + timeout
-    p = subprocess.Popen(
-        cmd, bufsize=1, stdin=si, stdout=so, stderr=se, close_fds=True)
-    os.write(mi, bytes_input)
-
-    select_timeout = .04  #seconds
-    res = {'stdout': b'', 'stderr': b''}
-    while True:
-        ready, _, _ = select.select([mo, me], [], [], select_timeout)
-        if ready:
-            for fd in ready:
-                data = os.read(fd, 512)
-                if not data:
-                    break
-                res[fdmap[fd]] += data
-        elif p.poll() is not None or time.time(
-        ) > timeout_exact:  # select timed-out
-            break  # p exited
-    for fd in [si, so, se, mi, mo, me]:
-        os.close(fd)  # can't do it sooner: it leads to errno.EIO error
-    p.wait()
-    return p.returncode, res['stdout'], res['stderr']
-
-
-class TestPrompt(unittest.TestCase):
-    def __init__(self, method_name, test_type, deno_exe):
-        super(TestPrompt, self).__init__(method_name)
-        self.test_type = test_type
-        self.deno_exe = deno_exe
-
     def _run_deno(self, flags, args, bytes_input):
         "Returns (return_code, stdout, stderr)."
         cmd = [self.deno_exe, "run"] + flags + [PERMISSIONS_PROMPT_TEST_TS
@@ -159,27 +118,29 @@ class TestPrompt(unittest.TestCase):
         assert not PERMISSION_DENIED_PATTERN in stderr
 
 
-def permission_prompt_test(deno_exe):
+class ReadPromptTest(DenoTestCase, BasePromptTest):
-    runner = unittest.TextTestRunner(verbosity=2)
+    test_type = "read"
-    loader = unittest.TestLoader()
-
-    test_types = ["read", "write", "env", "net", "run"]
-
-    for test_type in test_types:
-        print "Permissions prompt tests for \"{}\"".format(test_type)
-        test_names = loader.getTestCaseNames(TestPrompt)
-        suite = unittest.TestSuite()
-        for test_name in test_names:
-            suite.addTest(TestPrompt(test_name, test_type, deno_exe))
-        result = runner.run(suite)
-        if not result.wasSuccessful():
-            sys.exit(1)
 
 
-def main():
+class WritePromptTest(DenoTestCase, BasePromptTest):
-    deno_exe = os.path.join(build_path(), "deno" + executable_suffix)
+    test_type = "write"
-    permission_prompt_test(deno_exe)
+
+
+class EnvPromptTest(DenoTestCase, BasePromptTest):
+    test_type = "env"
+
+
+class NetPromptTest(DenoTestCase, BasePromptTest):
+    test_type = "net"
+
+
+class RunPromptTest(DenoTestCase, BasePromptTest):
+    test_type = "run"
+
+
+def permission_prompt_tests():
+    return BasePromptTest.__subclasses__()
 
 
 if __name__ == "__main__":
-    main()
+    test_main()

tools/repl_test.py

@@ -4,12 +4,12 @@ from subprocess import CalledProcessError, PIPE, Popen
 import sys
 import time
 
-from util import build_path, executable_suffix, green_ok
+from util import DenoTestCase, test_main
 
 
-class Repl(object):
+class TestRepl(DenoTestCase):
-    def __init__(self, deno_exe):
+    def __init__(self, *args, **kwargs):
-        self.deno_exe = deno_exe
+        super(TestRepl, self).__init__(*args, **kwargs)
         self._warm_up()
 
     def _warm_up(self):
@@ -40,26 +40,17 @@ class Repl(object):
         # Ignore Windows CRLF (\r\n).
         return out.replace('\r\n', '\n'), err.replace('\r\n', '\n'), retcode
 
-    def run(self):
-        print('repl_test.py')
-        test_names = [name for name in dir(self) if name.startswith("test_")]
-        for t in test_names:
-            self.__getattribute__(t)()
-            sys.stdout.write(".")
-            sys.stdout.flush()
-        print(' {}\n'.format(green_ok()))
-
     def test_console_log(self):
         out, err, code = self.input("console.log('hello')", "'world'")
-        assertEqual(out, 'hello\nundefined\nworld\n')
+        self.assertEqual(out, 'hello\nundefined\nworld\n')
-        assertEqual(err, '')
+        self.assertEqual(err, '')
-        assertEqual(code, 0)
+        self.assertEqual(code, 0)
 
     def test_exit_command(self):
         out, err, code = self.input("exit", "'ignored'", exit=False)
-        assertEqual(out, '')
+        self.assertEqual(out, '')
-        assertEqual(err, '')
+        self.assertEqual(err, '')
-        assertEqual(code, 0)
+        self.assertEqual(code, 0)
 
     def test_help_command(self):
         out, err, code = self.input("help")
@@ -68,100 +59,86 @@ class Repl(object):
             "help    Print this help message",
             "",
         ])
-        assertEqual(out, expectedOut)
+        self.assertEqual(out, expectedOut)
-        assertEqual(err, '')
+        self.assertEqual(err, '')
-        assertEqual(code, 0)
+        self.assertEqual(code, 0)
 
     def test_function(self):
         out, err, code = self.input("Deno.writeFileSync")
-        assertEqual(out, '[Function: writeFileSync]\n')
+        self.assertEqual(out, '[Function: writeFileSync]\n')
-        assertEqual(err, '')
+        self.assertEqual(err, '')
-        assertEqual(code, 0)
+        self.assertEqual(code, 0)
 
     def test_multiline(self):
         out, err, code = self.input("(\n1 + 2\n)")
-        assertEqual(out, '3\n')
+        self.assertEqual(out, '3\n')
-        assertEqual(err, '')
+        self.assertEqual(err, '')
-        assertEqual(code, 0)
+        self.assertEqual(code, 0)
 
     # This should print error instead of wait for input
     def test_eval_unterminated(self):
         out, err, code = self.input("eval('{')")
-        assertEqual(out, '')
+        self.assertEqual(out, '')
         assert "Unexpected end of input" in err
-        assertEqual(code, 0)
+        self.assertEqual(code, 0)
 
     def test_reference_error(self):
         out, err, code = self.input("not_a_variable")
-        assertEqual(out, '')
+        self.assertEqual(out, '')
         assert "not_a_variable is not defined" in err
-        assertEqual(code, 0)
+        self.assertEqual(code, 0)
 
     # def test_set_timeout(self):
     #     out, err, code = self.input(
     #         "setTimeout(() => { console.log('b'); Deno.exit(0); }, 1)",
     #         "'a'",
     #         exit=False)
-    #     assertEqual(out, '1\na\nb\n')
+    #     self.assertEqual(out, '1\na\nb\n')
-    #     assertEqual(err, '')
+    #     self.assertEqual(err, '')
-    #     assertEqual(code, 0)
+    #     self.assertEqual(code, 0)
 
     # def test_set_timeout_interlaced(self):
     #     out, err, code = self.input(
     #         "setTimeout(() => console.log('a'), 1)",
     #         "setTimeout(() => console.log('b'), 6)",
     #         sleep=0.8)
-    #     assertEqual(out, '1\n2\na\nb\n')
+    #     self.assertEqual(out, '1\n2\na\nb\n')
-    #     assertEqual(err, '')
+    #     self.assertEqual(err, '')
-    #     assertEqual(code, 0)
+    #     self.assertEqual(code, 0)
 
     # def test_async_op(self):
     #     out, err, code = self.input(
     #         "fetch('http://localhost:4545/tests/001_hello.js')" +
     #         ".then(res => res.text()).then(console.log)",
     #         sleep=1)
-    #     assertEqual(out, 'Promise {}\nconsole.log("Hello World");\n\n')
+    #     self.assertEqual(out, 'Promise {}\nconsole.log("Hello World");\n\n')
-    #     assertEqual(err, '')
+    #     self.assertEqual(err, '')
-    #     assertEqual(code, 0)
+    #     self.assertEqual(code, 0)
 
     def test_syntax_error(self):
         out, err, code = self.input("syntax error")
-        assertEqual(out, '')
+        self.assertEqual(out, '')
         assert "Unexpected identifier" in err
-        assertEqual(code, 0)
+        self.assertEqual(code, 0)
 
     def test_type_error(self):
         out, err, code = self.input("console()")
-        assertEqual(out, '')
+        self.assertEqual(out, '')
         assert "console is not a function" in err
-        assertEqual(code, 0)
+        self.assertEqual(code, 0)
 
     def test_variable(self):
         out, err, code = self.input("var a = 123;", "a")
-        assertEqual(out, 'undefined\n123\n')
+        self.assertEqual(out, 'undefined\n123\n')
-        assertEqual(err, '')
+        self.assertEqual(err, '')
-        assertEqual(code, 0)
+        self.assertEqual(code, 0)
 
     def test_lexical_scoped_variable(self):
         out, err, code = self.input("let a = 123;", "a")
-        assertEqual(out, 'undefined\n123\n')
+        self.assertEqual(out, 'undefined\n123\n')
-        assertEqual(err, '')
+        self.assertEqual(err, '')
-        assertEqual(code, 0)
+        self.assertEqual(code, 0)
-
-
-def assertEqual(left, right):
-    if left != right:
-        raise AssertionError("{} != {}".format(repr(left), repr(right)))
-
-
-def repl_tests(deno_exe):
-    Repl(deno_exe).run()
-
-
-def main():
-    deno_exe = os.path.join(build_path(), "deno" + executable_suffix)
-    repl_tests(deno_exe)
 
 
 if __name__ == "__main__":
-    main()
+    test_main()

tools/setup_test.py

@@ -1,14 +1,15 @@
 # Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import os
 import sys
-import unittest
 
 from setup import gn_string, read_gn_args, write_gn_args
 from shutil import rmtree
 from tempfile import mktemp
 
+from util import DenoTestCase, test_main
 
-class TestSetup(unittest.TestCase):
+
+class TestSetup(DenoTestCase):
     def test_gn_string(self):
         assert '"abc"' == gn_string('abc')
         assert '"foo\\$bar\\"baz"' == gn_string('foo$bar"baz')
@@ -61,12 +62,5 @@ class TestSetup(unittest.TestCase):
         rmtree(d)
 
 
-def setup_test():
-    suite = unittest.TestLoader().loadTestsFromTestCase(TestSetup)
-    result = unittest.TextTestRunner(verbosity=2).run(suite)
-    if not result.wasSuccessful():
-        sys.exit(1)
-
-
 if __name__ == '__main__':
-    setup_test()
+    test_main()

tools/test.py

@@ -3,127 +3,122 @@
 # Runs the full test suite.
 # Usage: ./tools/test.py out/Debug
 import os
+import subprocess
 import sys
 import unittest
 
-from integration_tests import integration_tests
+from benchmark_test import TestBenchmark
-from deno_dir_test import deno_dir_test
+from deno_dir_test import TestDenoDir
-from util import build_path, enable_ansi_colors, executable_suffix, run, rmtree
+from fetch_test import FetchTest
-from util import run_output, tests_path, green_ok
+from fmt_test import FmtTest
-from unit_tests import unit_tests
+from integration_tests import TestIntegrations
-from util_test import util_test
+from repl_test import TestRepl
-from setup_test import setup_test
+from setup_test import TestSetup
-from benchmark_test import benchmark_test
+from unit_tests import JsUnitTests
-from repl_test import repl_tests
+from util_test import TestUtil
-from fetch_test import fetch_test
+
-from fmt_test import fmt_test
+from is_tty_test import TestIsTty
-import subprocess
+# NOTE: These tests are skipped on Windows
-import http_server
+from permission_prompt_test import permission_prompt_tests
+from complex_permissions_test import complex_permissions_tests
+
+from http_server import spawn
+from util import (DenoTestCase, ColorTextTestRunner, enable_ansi_colors,
+                  executable_suffix, run, run_output, rmtree, tests_path,
+                  test_args)
 
 
-def check_exists(filename):
+class TestTarget(DenoTestCase):
+    @staticmethod
+    def check_exists(filename):
         if not os.path.exists(filename):
             print "Required target doesn't exist:", filename
             print "Run ./tools/build.py"
             sys.exit(1)
 
+    def test_executable_exists(self):
+        self.check_exists(self.deno_exe)
 
-def test_no_color(deno_exe):
+    def _test(self, executable):
-    sys.stdout.write("no_color test...")
+        "Test executable runs and exits with code 0."
-    sys.stdout.flush()
+        bin_file = os.path.join(self.build_dir, executable + executable_suffix)
-    t = os.path.join(tests_path, "no_color.js")
+        self.check_exists(bin_file)
-    output = run_output([deno_exe, "run", t], merge_env={"NO_COLOR": "1"})
+        run([bin_file])
-    assert output.strip() == "noColor true"
-    t = os.path.join(tests_path, "no_color.js")
-    output = run_output([deno_exe, "run", t])
-    assert output.strip() == "noColor false"
-    print green_ok()
 
+    def test_libdeno(self):
+        self._test("libdeno_test")
 
-def exec_path_test(deno_exe):
+    def test_cli(self):
-    cmd = [deno_exe, "run", "tests/exec_path.ts"]
+        self._test("cli_test")
-    output = run_output(cmd)
-    assert deno_exe in output.strip()
 
+    def test_core(self):
+        self._test("deno_core_test")
 
-def main(argv):
+    def test_core_http_benchmark(self):
-    if len(argv) == 2:
+        self._test("deno_core_http_bench_test")
-        build_dir = sys.argv[1]
-    elif len(argv) == 1:
-        build_dir = build_path()
-    else:
-        print "Usage: tools/test.py [build_dir]"
-        sys.exit(1)
-
-    deno_dir = os.path.join(build_dir, ".deno_test")
-    if os.path.isdir(deno_dir):
-        rmtree(deno_dir)
-    os.environ["DENO_DIR"] = deno_dir
-
-    enable_ansi_colors()
-
-    http_server.spawn()
-
-    deno_exe = os.path.join(build_dir, "deno" + executable_suffix)
-    check_exists(deno_exe)
-
-    # Python/build tools testing
-    setup_test()
-    util_test()
 
+    def test_ts_library_builder(self):
         run([
             "node", "./node_modules/.bin/ts-node", "--project",
             "tools/ts_library_builder/tsconfig.json",
             "tools/ts_library_builder/test.ts"
         ])
 
-    libdeno_test = os.path.join(build_dir, "libdeno_test" + executable_suffix)
+    def test_no_color(self):
-    check_exists(libdeno_test)
+        t = os.path.join(tests_path, "no_color.js")
-    run([libdeno_test])
+        output = run_output([self.deno_exe, "run", t],
+                            merge_env={"NO_COLOR": "1"})
+        assert output.strip() == "noColor true"
+        t = os.path.join(tests_path, "no_color.js")
+        output = run_output([self.deno_exe, "run", t])
+        assert output.strip() == "noColor false"
 
-    cli_test = os.path.join(build_dir, "cli_test" + executable_suffix)
+    def test_exec_path(self):
-    check_exists(cli_test)
+        cmd = [self.deno_exe, "run", "tests/exec_path.ts"]
-    run([cli_test])
+        output = run_output(cmd)
+        assert self.deno_exe in output.strip()
 
-    deno_core_test = os.path.join(build_dir,
-                                  "deno_core_test" + executable_suffix)
-    check_exists(deno_core_test)
-    run([deno_core_test])
 
-    deno_core_http_bench_test = os.path.join(
+def main(argv):
-        build_dir, "deno_core_http_bench_test" + executable_suffix)
+    args = test_args(argv)
-    check_exists(deno_core_http_bench_test)
-    run([deno_core_http_bench_test])
-
-    unit_tests(deno_exe)
-
-    fetch_test(deno_exe)
-    fmt_test(deno_exe)
-
-    integration_tests(deno_exe)
-
-    # TODO We currently skip testing the prompt and IsTTY in Windows completely.
-    # Windows does not support the pty module used for testing the permission
-    # prompt.
-    if os.name != 'nt':
-        from is_tty_test import is_tty_test
-        from permission_prompt_test import permission_prompt_test
-        from complex_permissions_test import complex_permissions_test
-        permission_prompt_test(deno_exe)
-        complex_permissions_test(deno_exe)
-        is_tty_test(deno_exe)
-
-    repl_tests(deno_exe)
 
+    deno_dir = os.path.join(args.build_dir, ".deno_test")
+    if os.path.isdir(deno_dir):
         rmtree(deno_dir)
+    os.environ["DENO_DIR"] = deno_dir
 
-    deno_dir_test(deno_exe, deno_dir)
+    enable_ansi_colors()
 
-    test_no_color(deno_exe)
+    with spawn():
+        test_cases = [
+            TestSetup,
+            TestUtil,
+            TestTarget,
+            JsUnitTests,
+            FetchTest,
+            FmtTest,
+            TestIntegrations,
+            TestRepl,
+            TestDenoDir,
+            TestBenchmark,
+        ]
+        # These tests are skipped, but to make the test output less noisy
+        # we'll avoid triggering them.
+        if os.name != 'nt':
+            test_cases.append(TestIsTty)
+            test_cases += permission_prompt_tests()
+            test_cases += complex_permissions_tests()
 
-    benchmark_test(build_dir, deno_exe)
+        suite = unittest.TestSuite([
-    exec_path_test(deno_exe)
+            unittest.TestLoader().loadTestsFromTestCase(tc)
+            for tc in test_cases
+        ])
+
+        result = ColorTextTestRunner(
+            verbosity=args.verbosity + 1, failfast=args.failfast).run(suite)
+        if not result.wasSuccessful():
+            sys.exit(1)
 
 
 if __name__ == '__main__':
-    sys.exit(main(sys.argv))
+    main(sys.argv[1:])

tools/unit_tests.py

@@ -2,12 +2,16 @@
 # Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import sys
 import subprocess
-import http_server
+
+from http_server import spawn
+from util import DenoTestCase, test_main
 
 
-def unit_tests(deno_exe):
+class JsUnitTests(DenoTestCase):
+    def test_unit_test_runner(self):
         cmd = [
-        deno_exe, "run", "--reload", "--allow-run", "js/unit_test_runner.ts"
+            self.deno_exe, "run", "--reload", "--allow-run",
+            "js/unit_test_runner.ts"
         ]
         process = subprocess.Popen(
             cmd, bufsize=1, universal_newlines=True, stderr=subprocess.STDOUT)
@@ -15,13 +19,10 @@ def unit_tests(deno_exe):
         process.wait()
         errcode = process.returncode
         if errcode != 0:
-        sys.exit(errcode)
+            raise AssertionError(
+                "js/unit_test_runner.ts exited with exit code %s" % errcode)
 
 
 if __name__ == '__main__':
-    if len(sys.argv) < 2:
+    with spawn():
-        print "Usage ./tools/unit_tests.py target/debug/deno"
+        test_main()
-        sys.exit(1)
-
-    http_server.spawn()
-    unit_tests(sys.argv[1])

tools/util.py

@@ -1,12 +1,17 @@
 # Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import argparse
 import os
 import re
 import shutil
+import select
 import stat
 import sys
 import subprocess
 import tempfile
+import time
+import unittest
 
+# FIXME support nocolor (use "" if passed?)
 RESET = "\x1b[0m"
 FG_RED = "\x1b[31m"
 FG_GREEN = "\x1b[32m"
@@ -85,14 +90,6 @@ def shell_quote(arg):
         return quote(arg)
 
 
-def red_failed():
-    return "%sFAILED%s" % (FG_RED, RESET)
-
-
-def green_ok():
-    return "%sok%s" % (FG_GREEN, RESET)
-
-
 def symlink(target, name, target_is_dir=False):
     if os.name == "nt":
         from ctypes import WinDLL, WinError, GetLastError
@@ -176,6 +173,8 @@ def rmtree(directory):
 def build_mode(default="debug"):
     if "DENO_BUILD_MODE" in os.environ:
         return os.environ["DENO_BUILD_MODE"]
+    elif "--release" in sys.argv:
+        return "release"
     else:
         return default
 
@@ -191,8 +190,6 @@ def build_path():
 # Returns True if the expected matches the actual output, allowing variation
 # from actual where expected has the wildcard (e.g. matches /.*/)
 def pattern_match(pattern, string, wildcard="[WILDCARD]"):
-    if len(pattern) == 0:
-        return string == 0
     if pattern == wildcard:
         return True
 
@@ -374,3 +371,122 @@ def mkdtemp():
     # 'TS5009: Cannot find the common subdirectory path for the input files.'
     temp_dir = os.environ["TEMP"] if os.name == 'nt' else None
     return tempfile.mkdtemp(dir=temp_dir)
+
+
+class DenoTestCase(unittest.TestCase):
+    @property
+    def build_dir(self):
+        args = test_args()
+        return args.build_dir
+
+    @property
+    def deno_exe(self):
+        return os.path.join(self.build_dir, "deno" + executable_suffix)
+
+
+# overload the test result class
+class ColorTextTestResult(unittest.TextTestResult):
+    def getDescription(self, test):
+        name = str(test)
+        if name.startswith("test_"):
+            name = name[5:]
+        return name
+
+    def addSuccess(self, test):
+        if self.showAll:
+            self.stream.write(FG_GREEN)
+        super(ColorTextTestResult, self).addSuccess(test)
+        if self.showAll:
+            self.stream.write(RESET)
+
+    def addError(self, test, err):
+        if self.showAll:
+            self.stream.write(FG_RED)
+        super(ColorTextTestResult, self).addError(test, err)
+        if self.showAll:
+            self.stream.write(RESET)
+
+    def addFailure(self, test, err):
+        if self.showAll:
+            self.stream.write(FG_RED)
+        super(ColorTextTestResult, self).addFailure(test, err)
+        if self.showAll:
+            self.stream.write(RESET)
+
+
+class ColorTextTestRunner(unittest.TextTestRunner):
+    resultclass = ColorTextTestResult
+
+
+def test_main():
+    args = test_args()
+    # FIXME(hayd) support more of the unittest.main API.
+    return unittest.main(
+        verbosity=args.verbosity + 1,
+        testRunner=ColorTextTestRunner,
+        failfast=args.failfast,
+        argv=[''])
+
+
+def test_args(argv=None):
+    if argv is None:
+        argv = sys.argv[1:]
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        '--failfast', '-f', action='store_true', help='Stop on first failure')
+    parser.add_argument(
+        '--verbosity', '-v', action='store_true', help='Verbose output')
+    parser.add_argument(
+        '--release',
+        action='store_true',
+        help='Test against release deno_executable')
+    parser.add_argument('build_dir', nargs='?', help='Deno build directory')
+    args = parser.parse_args(argv)
+    if args.build_dir and args.release:
+        raise argparse.ArgumentError(
+            None, "build_dir is inferred from --release, cannot provide both")
+    if not args.build_dir:
+        args.build_dir = build_path()
+
+    if not os.path.isfile(
+            os.path.join(args.build_dir, "deno" + executable_suffix)):
+        raise argparse.ArgumentError(None,
+                                     "deno executable not found in build_dir")
+    return args
+
+
+# This function is copied from:
+# https://gist.github.com/hayd/4f46a68fc697ba8888a7b517a414583e
+# https://stackoverflow.com/q/52954248/1240268
+def tty_capture(cmd, bytes_input, timeout=5):
+    """Capture the output of cmd with bytes_input to stdin,
+    with stdin, stdout and stderr as TTYs."""
+    # pty is not available on windows, so we import it within this function.
+    import pty
+    mo, so = pty.openpty()  # provide tty to enable line-buffering
+    me, se = pty.openpty()
+    mi, si = pty.openpty()
+    fdmap = {mo: 'stdout', me: 'stderr', mi: 'stdin'}
+
+    timeout_exact = time.time() + timeout
+    p = subprocess.Popen(
+        cmd, bufsize=1, stdin=si, stdout=so, stderr=se, close_fds=True)
+    os.write(mi, bytes_input)
+
+    select_timeout = .04  #seconds
+    res = {'stdout': b'', 'stderr': b''}
+    while True:
+        ready, _, _ = select.select([mo, me], [], [], select_timeout)
+        if ready:
+            for fd in ready:
+                data = os.read(fd, 512)
+                if not data:
+                    break
+                res[fdmap[fd]] += data
+        elif p.poll() is not None or time.time(
+        ) > timeout_exact:  # select timed-out
+            break  # p exited
+    for fd in [si, so, se, mi, mo, me]:
+        os.close(fd)  # can't do it sooner: it leads to errno.EIO error
+    p.wait()
+    return p.returncode, res['stdout'], res['stderr']

tools/util_test.py

@@ -1,18 +1,19 @@
 # Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import os
 import sys
-import unittest
 
 from util import (
+    DenoTestCase,
     pattern_match,
     parse_exit_code,
     shell_quote_win,
     parse_wrk_output,
     root_path,
+    test_main,
 )
-import os
 
 
-class TestUtil(unittest.TestCase):
+class TestUtil(DenoTestCase):
     def test_pattern_match(self):
         # yapf: disable
         fixtures = [("foobarbaz", "foobarbaz", True),
@@ -68,12 +69,5 @@ class TestUtil(unittest.TestCase):
         assert stats3['max_latency'] == 1630.0
 
 
-def util_test():
-    suite = unittest.TestLoader().loadTestsFromTestCase(TestUtil)
-    result = unittest.TextTestRunner(verbosity=2).run(suite)
-    if not result.wasSuccessful():
-        sys.exit(1)
-
-
 if __name__ == '__main__':
-    util_test()
+    test_main()