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

gio/tests/codegen.py

@@ -22,7 +22,6 @@
 
 """Integration tests for gdbus-codegen utility."""
 
-import collections
 import os
 import shutil
 import subprocess
@@ -33,15 +32,13 @@ import unittest
 import xml.etree.ElementTree as ET
 
 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 TestCodegen(unittest.TestCase):
+class TestCodegen(testprogramrunner.TestProgramRunner):
     """Integration test for running gdbus-codegen.
 
     This can be run when installed or uninstalled. When uninstalled, it
@@ -54,8 +51,8 @@ class TestCodegen(unittest.TestCase):
     just test command line behaviour in this integration test.
     """
 
-    # Track the cwd, we want to back out to that to clean up our tempdir
-    cwd = ""
+    PROGRAM_NAME = "gdbus-codegen"
+    PROGRAM_TYPE = testprogramrunner.ProgramType.INTERPRETED
 
     ARGUMENTS_TYPES = {
         "b": {"value_type": "boolean"},
@@ -78,59 +75,12 @@ class TestCodegen(unittest.TestCase):
         "asv": {"value_type": "variant", "variant_type": "a{sv}"},
     }
 
-    def setUp(self):
-        self.timeout_seconds = 6  # 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.__codegen = os.path.join(
-                os.environ["G_TEST_BUILDDIR"],
-                "..",
-                "gdbus-2.0",
-                "codegen",
-                "gdbus-codegen",
-            )
-        else:
-            self.__codegen = shutil.which("gdbus-codegen")
-        print("codegen:", self.__codegen)
-
-    def tearDown(self):
-        os.chdir(self.cwd)
-        self.tmpdir.cleanup()
-
     def runCodegen(self, *args):
-        argv = [self.__codegen]
-
-        # 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": "/*\n"
             " * This file is generated by gdbus-codegen, do not modify it.\n"
             " *\n"
@@ -326,11 +276,6 @@ class TestCodegen(unittest.TestCase):
             "}",
         }
 
-        result = Result(info, out, err, subs)
-
-        print("Output:", result.out)
-        return result
-
     def runCodegenWithInterface(self, interface_contents, *args):
         with tempfile.NamedTemporaryFile(
             dir=self.tmpdir.name, suffix=".xml", delete=False