Issue #21650: Add an --sort-keys option to json.tool CLI.

Lib/test/test_json/test_tool.py

@@ -6,6 +6,7 @@ import subprocess
 from test import support
 from test.script_helper import assert_python_ok
 
+
 class TestTool(unittest.TestCase):
     data = """
 
@@ -15,7 +16,7 @@ class TestTool(unittest.TestCase):
             :"yes"}  ]
            """
 
-    expect = textwrap.dedent("""\
+    expect_without_sort_keys = textwrap.dedent("""\
     [
         [
             "blorpie"
@@ -37,6 +38,28 @@ class TestTool(unittest.TestCase):
     ]
     """)
 
+    expect = textwrap.dedent("""\
+    [
+        [
+            "blorpie"
+        ],
+        [
+            "whoops"
+        ],
+        [],
+        "d-shtaeou",
+        "d-nthiouh",
+        "i-vhbjkhnth",
+        {
+            "nifty": 87
+        },
+        {
+            "morefield": false,
+            "field": "yes"
+        }
+    ]
+    """)
+
     def test_stdin_stdout(self):
         with subprocess.Popen(
                 (sys.executable, '-m', 'json.tool'),
@@ -75,3 +98,11 @@ class TestTool(unittest.TestCase):
         self.assertEqual(rc, 0)
         self.assertTrue(out.startswith(b'usage: '))
         self.assertEqual(err, b'')
+
+    def test_sort_keys_flag(self):
+        infile = self._create_infile()
+        rc, out, err = assert_python_ok('-m', 'json.tool', '--sort-keys', infile)
+        self.assertEqual(rc, 0)
+        self.assertEqual(out.splitlines(),
+                         self.expect_without_sort_keys.encode().splitlines())
+        self.assertEqual(err, b'')