tests/lib: Add a new unittest type to simplify launching test programs

We were reusing the same logic everywhere, while we can just reuse an
unique class to base our tests on that avoids having to copy-and-paste
code for no good reason

gobject/tests/genmarshal.py

@@ -22,7 +22,6 @@
 
 """Integration tests for glib-genmarshal utility."""
 
-import collections
 import os
 import shutil
 import subprocess
@@ -32,16 +31,14 @@ from textwrap import dedent
 import unittest
 
 import taptestrunner
+import testprogramrunner
 
 
 # Disable line length warnings as wrapping the C code templates would be hard
 # flake8: noqa: E501
 
 
-Result = collections.namedtuple("Result", ("info", "out", "err", "subs"))
-
-
-class TestGenmarshal(unittest.TestCase):
+class TestGenmarshal(testprogramrunner.TestProgramRunner):
     """Integration test for running glib-genmarshal.
 
     This can be run when installed or uninstalled. When uninstalled, it
@@ -54,58 +51,15 @@ class TestGenmarshal(unittest.TestCase):
     convert this test to just check command line behaviour.
     """
 
-    # Track the cwd, we want to back out to that to clean up our tempdir
-    cwd = ""
-
-    def setUp(self):
-        self.timeout_seconds = 10  # seconds per test
-        self.tmpdir = tempfile.TemporaryDirectory()
-        self.cwd = os.getcwd()
-        os.chdir(self.tmpdir.name)
-        print("tmpdir:", self.tmpdir.name)
-        if "G_TEST_BUILDDIR" in os.environ:
-            self.__genmarshal = os.path.join(
-                os.environ["G_TEST_BUILDDIR"], "..", "glib-genmarshal"
-            )
-        else:
-            self.__genmarshal = shutil.which("glib-genmarshal")
-        print("genmarshal:", self.__genmarshal)
-
-    def tearDown(self):
-        os.chdir(self.cwd)
-        self.tmpdir.cleanup()
+    PROGRAM_NAME = "glib-genmarshal"
+    PROGRAM_TYPE = testprogramrunner.ProgramType.INTERPRETED
 
     def runGenmarshal(self, *args):
-        argv = [self.__genmarshal]
-
-        # shebang lines are not supported on native
-        # Windows consoles
-        if os.name == "nt":
-            argv.insert(0, sys.executable)
-
-        argv.extend(args)
-        print("Running:", argv)
-
-        env = os.environ.copy()
-        env["LC_ALL"] = "C.UTF-8"
-        env["G_DEBUG"] = "fatal-warnings"
-        print("Environment:", env)
-
-        # We want to ensure consistent line endings...
-        info = subprocess.run(
-            argv,
-            timeout=self.timeout_seconds,
-            stdout=subprocess.PIPE,
-            stderr=subprocess.PIPE,
-            env=env,
-            universal_newlines=True,
-        )
-        info.check_returncode()
-        out = info.stdout.strip()
-        err = info.stderr.strip()
+        return self.runTestProgram(args)
 
+    def _getSubs(self):
         # Known substitutions for standard boilerplate
-        subs = {
+        return {
             "standard_top_comment": "This file is generated by glib-genmarshal, do not modify "
             "it. This code is licensed under the same license as the "
             "containing project. Note that it links to GLib, so must "