Rename a test that wasn't being run

PiperOrigin-RevId: 566644205

javatests/com/google/turbine/lower/MissingJavaBaseModule.java → javatests/com/google/turbine/lower/MissingJavaBaseModuleTest.java

@@ -40,7 +40,7 @@
 import org.junit.runners.JUnit4;
 
 @RunWith(JUnit4.class)
-public class MissingJavaBaseModule {
+public class MissingJavaBaseModuleTest {
 
   @Test
   public void test() throws Exception {