test: test configure ninja

- Updated the tooltest target to run unittest module
- Renamed test/tools/test-js2c.py to be discoverable by unittest module
- Added test class for `configure` shell script
- Added a test to ensure `configure` script exits with status code zero
when passed the `--ninja` flag

Closes: https://github.com/nodejs/node/issues/29415

PR-URL: https://github.com/nodejs/node/pull/30033
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Christian Clauss <cclauss@me.com>

test/tools/test_configure.py

@@ -0,0 +1,29 @@
+import sys
+import os
+import unittest
+import subprocess
+
+
+class ConfigureTests(unittest.TestCase):
+  def setUp(self):
+    self.working_dir = os.path.abspath(
+      os.path.join(
+        os.path.dirname(__file__),
+        '..', '..'
+      )
+    )
+
+  def test_ninja(self):
+    subprocess.check_call(
+      './configure --ninja',
+      cwd=self.working_dir,
+      shell=True,
+      stdout=subprocess.PIPE,
+      stderr=subprocess.PIPE
+    )
+
+
+if (__name__ == '__main__' and
+    sys.platform in ['linux', 'linux2', 'darwin', 'cygwin']):
+
+  unittest.main()