Add dummy googletest

Uses the built in cmake -Dtest=ON

It should download googletest on the fly if needed.

Adds a new make target, `make test`

Ref #167

cockatrice/CMakeLists.txt

@@ -341,3 +341,11 @@ option(PORTABLE "portable build" OFF)
 IF(PORTABLE)
 add_definitions(-DPORTABLE_BUILD)
 endif()
+
+if(test)
+    enable_testing()
+    message(STATUS "Adding tests")
+    add_executable(cockatrice_test test/dummy_test.cpp)
+    target_link_libraries(cockatrice_test gtest_main)
+    add_test(NAME cockatrice_test COMMAND cockatrice_test)
+endif()

cockatrice/test/dummy_test.cpp

@@ -0,0 +1,16 @@
+#include "gtest/gtest.h"
+
+namespace {
+    class FooTest : public ::testing::Test {
+
+    };
+
+    TEST(DummyTest, Works) {
+        ASSERT_EQ(1, 1) << "One is not equal to one";
+    }
+}
+
+int main(int argc, char **argv) {
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}