Only run LevelDbHasSnappySupportCompiledIn in cmake builds

Author: dconeybe

Firestore/core/test/unit/local/CMakeLists.txt

@@ -42,6 +42,14 @@ firebase_ios_glob(
 )
 firebase_ios_add_test(firestore_local_test ${sources})
 
+# Set a preprocessor define so that tests can distinguish between having been
+# built by Xcode vs. cmake.
+target_compile_definitions(
+  firestore_local_test
+  PRIVATE
+  FIRESTORE_TESTS_CMAKE_BUILD
+)
+
 target_link_libraries(
   firestore_local_test PRIVATE
   GMock::GMock

Firestore/core/test/unit/local/leveldb_snappy_test.cc

@@ -43,6 +43,12 @@ Path CreateLevelDbDatabaseThatUsesSnappyCompression();
 // This test ensures that we don't accidentally regress having added in Snappy
 // compression support (https://github.com/firebase/firebase-ios-sdk/pull/9596).
 TEST(LevelDbSnappy, LevelDbHasSnappySupportCompiledIn) {
+  // Only run this test in cmake builds, since Snappy support is not included
+  // when pulling in LevelDb via CocoaPods or Swift Package Manager.
+  #if FIRESTORE_TESTS_CMAKE_BUILD
+  GTEST_SKIP() << "Snappy support is only present in cmake builds";
+  #endif
+
   Path leveldb_path = CreateLevelDbDatabaseThatUsesSnappyCompression();
   if (HasFatalFailure()) return;