reorg: move js runtime tests to cli/js/tests/ (#4250)

All Deno runtime test files were moved to cli/js/tests/ directory.

It makes a clear distinction that cli/js/tests/ contains code
that is run under Deno runtime as opposed to code in cli/js/ which
is used to create bundle and snapshot with "deno_typescript".

cli/js/tests/mkdir_test.ts

@@ -0,0 +1,76 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { unitTest, assert, assertEquals } from "./test_util.ts";
+
+unitTest(
+  { perms: { read: true, write: true } },
+  function mkdirSyncSuccess(): void {
+    const path = Deno.makeTempDirSync() + "/dir";
+    Deno.mkdirSync(path);
+    const pathInfo = Deno.statSync(path);
+    assert(pathInfo.isDirectory());
+  }
+);
+
+unitTest(
+  { perms: { read: true, write: true } },
+  function mkdirSyncMode(): void {
+    const path = Deno.makeTempDirSync() + "/dir";
+    Deno.mkdirSync(path, { mode: 0o755 }); // no perm for x
+    const pathInfo = Deno.statSync(path);
+    if (pathInfo.mode !== null) {
+      // Skip windows
+      assertEquals(pathInfo.mode & 0o777, 0o755);
+    }
+  }
+);
+
+unitTest({ perms: { write: false } }, function mkdirSyncPerm(): void {
+  let err;
+  try {
+    Deno.mkdirSync("/baddir");
+  } catch (e) {
+    err = e;
+  }
+  assert(err instanceof Deno.errors.PermissionDenied);
+  assertEquals(err.name, "PermissionDenied");
+});
+
+unitTest(
+  { perms: { read: true, write: true } },
+  async function mkdirSuccess(): Promise<void> {
+    const path = Deno.makeTempDirSync() + "/dir";
+    await Deno.mkdir(path);
+    const pathInfo = Deno.statSync(path);
+    assert(pathInfo.isDirectory());
+  }
+);
+
+unitTest({ perms: { write: true } }, function mkdirErrIfExists(): void {
+  let err;
+  try {
+    Deno.mkdirSync(".");
+  } catch (e) {
+    err = e;
+  }
+  assert(err instanceof Deno.errors.AlreadyExists);
+});
+
+unitTest(
+  { perms: { read: true, write: true } },
+  function mkdirSyncRecursive(): void {
+    const path = Deno.makeTempDirSync() + "/nested/directory";
+    Deno.mkdirSync(path, { recursive: true });
+    const pathInfo = Deno.statSync(path);
+    assert(pathInfo.isDirectory());
+  }
+);
+
+unitTest(
+  { perms: { read: true, write: true } },
+  async function mkdirRecursive(): Promise<void> {
+    const path = Deno.makeTempDirSync() + "/nested/directory";
+    await Deno.mkdir(path, { recursive: true });
+    const pathInfo = Deno.statSync(path);
+    assert(pathInfo.isDirectory());
+  }
+);