test: Mark tests as skipped if requirements were not satisfied

Instead of not creating the test at all, let's always create test but
simply mark them as skipped as this is more observable than simply not
creating the test at all.

test/integration-tests/integration-test-wrapper.py

@@ -365,6 +365,7 @@ def main() -> None:
     parser.add_argument('--coredump-exclude-regex', required=True)
     parser.add_argument('--sanitizer-exclude-regex', required=True)
     parser.add_argument('--rtc', action=argparse.BooleanOptionalAction)
+    parser.add_argument('--skip', action=argparse.BooleanOptionalAction)
     parser.add_argument('mkosi_args', nargs='*')
     args = parser.parse_args()
 
@@ -386,6 +387,10 @@ def main() -> None:
         print(f'TEST_NO_QEMU=1, skipping {args.name}', file=sys.stderr)
         exit(77)
 
+    if args.skip:
+        print(f'meson requirements for test {args.name} were not fulfilled, skipping', file=sys.stderr)
+        exit(77)
+
     for s in os.getenv('TEST_SKIP', '').split():
         if s in args.name:
             print(f'Skipping {args.name} due to TEST_SKIP', file=sys.stderr)

test/integration-tests/meson.build

@@ -125,6 +125,10 @@ foreach integration_test : integration_tests
                 integration_test_args += ['--rtc']
         endif
 
+        if not integration_test['enabled']
+                integration_test_args += ['--skip']
+        endif
+
         if not mkosi.found()
                 continue
         endif
@@ -153,10 +157,6 @@ foreach integration_test : integration_tests
                 integration_test_env += {'SYSTEMD_INTEGRATION_TESTS': '1'}
         endif
 
-        if not integration_test['enabled']
-                continue
-        endif
-
         # We don't explicitly depend on the "mkosi" target because that means the image is rebuilt on every
         # "ninja -C build". Instead, the mkosi target has to be rebuilt manually before running the
         # integration tests with mkosi.