Allow running individual unit tests

src/main.cpp

@@ -217,7 +217,10 @@ int main(int argc, char *argv[])
 	// Run unit tests
 	if (cmd_args.getFlag("run-unittests")) {
 #if BUILD_UNITTESTS
-		return run_tests();
+		if (cmd_args.exists("test-module"))
+			return run_tests(cmd_args.get("test-module")) ? 0 : 1;
+		else
+			return run_tests() ? 0 : 1;
 #else
 		errorstream << "Unittest support is not enabled in this binary. "
 			<< "If you want to enable it, compile project with BUILD_UNITTESTS=1 flag."
@@ -327,6 +330,8 @@ static void set_allowed_options(OptionList *allowed_options)
 			_("Run the unit tests and exit"))));
 	allowed_options->insert(std::make_pair("run-benchmarks", ValueSpec(VALUETYPE_FLAG,
 			_("Run the benchmarks and exit"))));
+	allowed_options->insert(std::make_pair("test-module", ValueSpec(VALUETYPE_STRING,
+			_("Only run the specified test module"))));
 	allowed_options->insert(std::make_pair("map-dir", ValueSpec(VALUETYPE_STRING,
 			_("Same as --world (deprecated)"))));
 	allowed_options->insert(std::make_pair("world", ValueSpec(VALUETYPE_STRING,

src/unittest/test.cpp

@@ -226,12 +226,12 @@ bool run_tests()
 	u32 num_total_tests_failed = 0;
 	u32 num_total_tests_run    = 0;
 	std::vector<TestBase *> &testmods = TestManager::getTestModules();
-	for (size_t i = 0; i != testmods.size(); i++) {
-		if (!testmods[i]->testModule(&gamedef))
+	for (auto *testmod: testmods) {
+		if (!testmod->testModule(&gamedef))
 			num_modules_failed++;
 
-		num_total_tests_failed += testmods[i]->num_tests_failed;
-		num_total_tests_run += testmods[i]->num_tests_run;
+		num_total_tests_failed += testmod->num_tests_failed;
+		num_total_tests_run += testmod->num_tests_run;
 	}
 
 	u64 tdiff = porting::getTimeMs() - t1;
@@ -251,7 +251,49 @@ bool run_tests()
 		<< "++++++++++++++++++++++++++++++++++++++++"
 		<< "++++++++++++++++++++++++++++++++++++++++" << std::endl;
 
-	return num_modules_failed;
+	return num_modules_failed == 0;
+}
+
+static TestBase *findTestModule(const std::string &module_name) {
+	std::vector<TestBase *> &testmods = TestManager::getTestModules();
+	for (auto *testmod: testmods) {
+		if (module_name == testmod->getName())
+			return testmod;
+	}
+	return nullptr;
+}
+
+bool run_tests(const std::string &module_name)
+{
+	TestGameDef gamedef;
+
+	auto testmod = findTestModule(module_name);
+	if (!testmod) {
+		errorstream << "Test module not found: " << module_name << std::endl;
+		return 1;
+	}
+
+	g_logger.setLevelSilenced(LL_ERROR, true);
+	u64 t1 = porting::getTimeMs();
+
+	bool ok = testmod->testModule(&gamedef);
+
+	u64 tdiff = porting::getTimeMs() - t1;
+	g_logger.setLevelSilenced(LL_ERROR, false);
+
+	const char *overall_status = ok ? "PASSED" : "FAILED";
+
+	rawstream
+		<< "++++++++++++++++++++++++++++++++++++++++"
+		<< "++++++++++++++++++++++++++++++++++++++++" << std::endl
+		<< "Unit Test Results: " << overall_status << std::endl
+		<< "    " << testmod->num_tests_failed << " / "
+		<< testmod->num_tests_run << " failed tests." << std::endl
+		<< "    Testing took " << tdiff << "ms." << std::endl
+		<< "++++++++++++++++++++++++++++++++++++++++"
+		<< "++++++++++++++++++++++++++++++++++++++++" << std::endl;
+
+	return ok;
 }
 
 ////

src/unittest/test.h

@@ -140,3 +140,4 @@ extern content_t t_CONTENT_LAVA;
 extern content_t t_CONTENT_BRICK;
 
 bool run_tests();
+bool run_tests(const std::string &module_name);