add a test and run test suite

Rakefile.rb

@@ -8,6 +8,7 @@ task :default do
     sources = Dir["gtest-1.7.0/src/gtest-all.cc", "*.cc"]
     env.Program("tst", sources)
   end
+  system("./tst")
 end
 
 task :clean do

main.cc

@@ -3,7 +3,19 @@
 
 using namespace std;
 
+class GTestTest : public testing::Test
+{
+protected:
+};
+
+TEST_F(GTestTest, first_test)
+{
+    EXPECT_EQ(4, 4);
+    EXPECT_EQ(3, 4);
+}
+
 int main(int argc, char * argv[])
 {
-    cout << "hi" << endl;
+    testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
 }