[tests][c] Provide our own test runner main and setup a dummy error handler.

tests/common/Tests.C.cpp

@@ -1,4 +1,4 @@
-#define CATCH_CONFIG_MAIN
+#define CATCH_CONFIG_RUNNER
 #include <catch.hpp>
 
 #include "managed.h"
@@ -181,3 +181,12 @@ TEST_CASE("Arrays.C", "[C][Arrays]") {
     REQUIRE(strcmp(g_array_index(_string.array, gchar*, 1), "2") == 0);
     REQUIRE(strcmp(g_array_index(_string.array, gchar*, 2), "3") == 0);
 }
+
+int main( int argc, char* argv[] )
+{
+    // Setup a null error handler so we can test exceptions.
+    mono_embeddinator_install_error_report_hook(0);
+
+    int result = Catch::Session().run(argc, argv);
+    return (result < 0xff ? result : 0xff);
+}