diff --git a/packages/mdc-textfield/character-counter/test/component.test.ts b/packages/mdc-textfield/character-counter/test/component_test.ts
similarity index 100%
rename from packages/mdc-textfield/character-counter/test/component.test.ts
rename to packages/mdc-textfield/character-counter/test/component_test.ts
diff --git a/packages/mdc-textfield/character-counter/test/foundation.test.ts b/packages/mdc-textfield/character-counter/test/foundation_test.ts
similarity index 100%
rename from packages/mdc-textfield/character-counter/test/foundation.test.ts
rename to packages/mdc-textfield/character-counter/test/foundation_test.ts