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.

1 files changed, 18 insertions, 17 deletions

diff --git a/tools/unit_tests.py b/tools/unit_tests.py
index 10f6a4a47..439ea325f 100755
--- a/tools/unit_tests.py
+++ b/tools/unit_tests.py
@@ -2,26 +2,27 @@
 # 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):
-    cmd = [
-        deno_exe, "run", "--reload", "--allow-run", "js/unit_test_runner.ts"
-    ]
-    process = subprocess.Popen(
-        cmd, bufsize=1, universal_newlines=True, stderr=subprocess.STDOUT)
 
-    process.wait()
-    errcode = process.returncode
-    if errcode != 0:
-        sys.exit(errcode)
+class JsUnitTests(DenoTestCase):
+    def test_unit_test_runner(self):
+        cmd = [
+            self.deno_exe, "run", "--reload", "--allow-run",
+            "js/unit_test_runner.ts"
+        ]
+        process = subprocess.Popen(
+            cmd, bufsize=1, universal_newlines=True, stderr=subprocess.STDOUT)
 
+        process.wait()
+        errcode = process.returncode
+        if errcode != 0:
+            raise AssertionError(
+                "js/unit_test_runner.ts exited with exit code %s" % errcode)
 
-if __name__ == '__main__':
-    if len(sys.argv) < 2:
-        print "Usage ./tools/unit_tests.py target/debug/deno"
-        sys.exit(1)
 
-    http_server.spawn()
-    unit_tests(sys.argv[1])
+if __name__ == '__main__':
+    with spawn():
+        test_main()