add test_Ref.cc

test/src/test_Ref.cc

@@ -0,0 +1,24 @@
+#include "gtest/gtest.h"
+#include "jes/Ref.h"
+#include <algorithm>
+
+using namespace jes;
+
+class Foo
+{
+};
+typedef Ref<Foo> FooRef;
+
+TEST(RefTest, checking_for_null)
+{
+    FooRef f = NULL;
+    FooRef f2 = new Foo();
+
+    EXPECT_TRUE(f == NULL);
+    EXPECT_TRUE(f.is_null());
+    EXPECT_FALSE(f != NULL);
+
+    EXPECT_FALSE(f2 == NULL);
+    EXPECT_FALSE(f2.is_null());
+    EXPECT_TRUE(f2 != NULL);
+}