Linking error while building for testing

[lingolab2]

Getting this linker error while building for testing:
Undefined symbols for architecture x86_64:
"__T07RxSwift14ObservableTypeP0A5CocoaE4bindAA10Disposable_pqd__2to_tAA08ObserverD0Rd__1EQyd__AIRtzlF", referenced from:
__T017RepoSearcherTests021LanguageListViewModelC0C011test_Selectd9_EmitsDidiD0yyF in LanguageListViewModelTests.o
__T017RepoSearcherTests021LanguageListViewModelC0C020test_Cancel_EmitsDidI0yyF in LanguageListViewModelTests.o
__T017RepoSearcherTests023RepositoryListViewModelC0C46test_InitWithInitialLanguage_SendsValidRequestyyF in RepositoryListViewModelTests.o
__T017RepoSearcherTests023RepositoryListViewModelC0C030test_Repositories_ReturnsValidF6ModelsyyF in RepositoryListViewModelTests.o
__T017RepoSearcherTests023RepositoryListViewModelC0C51test_RepositoriesWithNetworkError_EmitsAlertMessageyyF in RepositoryListViewModelTests.o
__T017RepoSearcherTests023RepositoryListViewModelC0C39test_LanguageChange_UpdatesRepositoriesyyF in RepositoryListViewModelTests.o
__T017RepoSearcherTests023RepositoryListViewModelC0C011test_Selectd10_EmitsShowD0yyF in RepositoryListViewModelTests.o
...
ld: symbol(s) not found for architecture x86_64