Revert "[TMP] Test args code"

This reverts commit 9c54fd6.

Author: 3manifold

tests/test.cc

@@ -6,8 +6,8 @@ std::string g_data_dir;
 
 int main(int argc, char *argv[]) {
   testing::InitGoogleTest(&argc, argv);
-  // if (argc < 2)
-  //   throw std::invalid_argument("missing data directory");
-  g_data_dir = "../../tests/data"; // test data reside in <project_root>/tests/data;;
+  if (argc < 2)
+    throw std::invalid_argument("missing data directory");
+  g_data_dir = argv[1];
   return RUN_ALL_TESTS();
 }