mu-test: add valgrind check

Make it a bit easier to skip some tests when running under valgrind.

Makefile

@@ -93,6 +93,7 @@ $(BUILDDIR_VALGRIND):
 vg_opts:=--enable-debuginfod=no --leak-check=full --error-exitcode=1
 test-valgrind: export G_SLICE=always-malloc
 test-valgrind: export G_DEBUG=gc-friendly
+test-valgrind: export MU_VALGRIND=memcheck
 test-valgrind: build-valgrind
 	@$(MESON) test -C $(BUILDDIR_VALGRIND)			\
 		--wrap="$(VALGRIND) $(vg_opts)"			\
@@ -102,6 +103,7 @@ check-valgrind: test-valgrind
 
 # we do _not_ pass helgrind; but this seems to be a false-alarm
 #    https://gitlab.gnome.org/GNOME/glib/-/issues/2662
+test-helgrind: export MU_VALGRIND=helgrind
 test-helgrind: $(BUILDDIR_VALGRIND)
 	$(MESON) -C $(BUILDDIR_VALGRIND) test	\
 	--wrap="$(VALGRIND) --tool=helgrind --error-exitcode=1"	\

lib/utils/mu-test-utils.cc

@@ -42,6 +42,13 @@ Mu::mu_test_mu_hacker()
 {
 	return !!g_getenv("MU_HACKER");
 }
+
+bool
+Mu::mu_test_mu_valgrind()
+{
+	return !!g_getenv("MU_VALGRIND");
+}
+
 /* LCOV_EXCL_STOP*/
 
 

lib/utils/mu-test-utils.hh

@@ -43,6 +43,23 @@ void mu_test_init(int *argc, char ***argv);
  */
 bool mu_test_mu_hacker();
 
+/**
+ * Are we running under Valgrind?
+ *
+ * @return true or false
+ */
+bool mu_test_mu_valgrind();
+
+/**
+ * Skip test when running under valgrind
+ */
+#define mu_test_skip_valgrind_return() do {				\
+		if (mu_test_mu_valgrind()) {				\
+			g_test_skip("skip (valgrind not supported)");	\
+			return;						\
+		}							\
+	} while(0)
+
 /**
  * set the timezone
  *