Fail when no tests are found

Author: Donnerbart

src/main/java/de/donnerbart/split/TestSplit.java

@@ -64,7 +64,12 @@ public void run() throws Exception {
         LOG.info("Working directory: {}", workingDirectory);
         final var testPaths = getPaths(workingDirectory, glob, excludeGlob);
         final var classNames = fileToClassName(testPaths, exitCodeConsumer);
-        LOG.info("Found {} test classes", classNames.size());
+        if (classNames.isEmpty()) {
+            LOG.error("Found no test classes");
+            exitCodeConsumer.accept(1);
+        } else {
+            LOG.info("Found {} test classes", classNames.size());
+        }
 
         final var testCases = new HashSet<TestCase>();
         if (junitGlob != null) {

src/test/java/de/donnerbart/split/TestSplitTest.java

@@ -133,6 +133,24 @@ void run_withJUnit_secondSplit() throws Exception {
         assertThat(exitCode).hasNullValue();
     }
 
+    @Test
+    void run_noTests() throws Exception {
+        final var projectFolder = tmp.resolve("no-tests-project").resolve("src").resolve("main").resolve("java");
+
+        final var testSplit = new TestSplit(0,
+                1,
+                "**/no-tests-project/**/*Test.java",
+                null,
+                null,
+                projectFolder,
+                true,
+                exitCode::set);
+        testSplit.run();
+
+        assertThat(systemOut.getLinesNormalized()).isEmpty();
+        assertThat(exitCode).hasValue(1);
+    }
+
     @Test
     void run_noPackage() throws Exception {
         final var projectFolder = tmp.resolve("no-package-project").resolve("src").resolve("main").resolve("java");