feat: simple test example

src/test.cpp

@@ -1,17 +1,5 @@
-#include "lib.hh"
-#include "prep/prep.hh"
-
 #include <gtest/gtest.h>
 
-// TEST(TestSuiteName, testName) {...}
-/* TEST(ProgramTest, testFunction) {
-    EXPECT_EQ(functionToTest(4), 8);
-} */
-
-/* TEST(ProgramTest, testFunctionShouldFail) {
-    EXPECT_EQ(functionToTest(4), 12);
-} */
-
-/* TEST(PrepTest, testAddFunc) {
-    EXPECT_EQ(add(4, 2), 6);
-} */
+TEST(ProgramTest, testFunction) {
+    EXPECT_EQ(8, 8);
+}