test: guard apps against build-only modules

modules/apps/vehicle-history-app/src/test/java/com/lingniu/ingest/historyapp/MavenModuleProfileTest.java

@@ -10,6 +10,7 @@ import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Stream;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -43,6 +44,16 @@ class MavenModuleProfileTest {
                         "modules/apps/xinda-push-app");
     }
 
+    @Test
+    void appsDirectoryContainsOnlyRealMavenModules() throws Exception {
+        try (Stream<Path> apps = Files.list(repositoryRoot().resolve("modules/apps"))) {
+            assertThat(apps.filter(Files::isDirectory)
+                    .filter(path -> !Files.exists(path.resolve("pom.xml")))
+                    .map(path -> path.getFileName().toString()))
+                    .isEmpty();
+        }
+    }
+
     @Test
     void readmeMatchesCurrentRuntimeVersionsAndSplitAppResponsibilities() throws Exception {
         Document pom = rootPom();