Add test runner log when test case class is not loaded.

The test runner will only load TestCase classes that have a public
constructor with either no params or a single String parameter.

This is fairly subtle behavior and can be difficult to catch. This change
adds a log message when a TestCase class is not loaded, and adds some
associated unit tests.

Change-Id: I6fc63e4179c949620f5773e0ae134f99905a6fb2

test-runner/src/android/test/suitebuilder/TestGrouping.java

@@ -46,6 +46,8 @@ import java.util.TreeSet;
  */
 public class TestGrouping {
 
+    private static final String LOG_TAG = "TestGrouping";
+
     SortedSet<Class<? extends TestCase>> testCaseClasses;
 
     public static final Comparator<Class<? extends TestCase>> SORT_BY_SIMPLE_NAME
@@ -114,7 +116,7 @@ public class TestGrouping {
         for (String packageName : packageNames) {
             List<Class<? extends TestCase>> addedClasses = testCaseClassesInPackage(packageName);
             if (addedClasses.isEmpty()) {
-                Log.w("TestGrouping", "Invalid Package: '" + packageName
+                Log.w(LOG_TAG, "Invalid Package: '" + packageName
                         + "' could not be found or has no tests");
             }
             testCaseClasses.addAll(addedClasses);
@@ -234,6 +236,10 @@ public class TestGrouping {
                     }
                 }
             }
+            Log.i(LOG_TAG, String.format(
+                    "TestCase class %s is missing a public constructor with no parameters " +
+                    "or a single String parameter - skipping",
+                    aClass.getName()));
             return false;
         }
     }

test-runner/tests/src/android/test/suitebuilder/TestGroupingTest.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.test.suitebuilder;
+
+import java.util.List;
+
+import junit.framework.TestCase;
+
+/**
+ * Unit tests for {@link TestGrouping}
+ */
+public class TestGroupingTest extends TestCase {
+
+    private TestGrouping mGrouping;
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        mGrouping = new TestGrouping(TestGrouping.SORT_BY_SIMPLE_NAME);
+    }
+
+    /**
+     * Verifies that TestCases with no public constructor are not loaded.
+     * Relies on fixture classes in android.test.suitebuilder.examples.constructor
+     */
+    public void testGetTests_noPublicConstructor() {
+        mGrouping.addPackagesRecursive("android.test.suitebuilder.examples.constructor");
+        List<TestMethod> tests = mGrouping.getTests();
+        // only the PublicConstructorTest's test method should be present
+        assertEquals(1, tests.size());
+        assertEquals("testPublicConstructor", tests.get(0).getName());
+    }
+}

test-runner/tests/src/android/test/suitebuilder/examples/constructor/NoPublicConstructorTest.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.test.suitebuilder.examples.constructor;
+
+import junit.framework.TestCase;
+
+/**
+ * A {@link TestCase} which should not be loaded since it has non-public constructors with no args.
+ */
+public class NoPublicConstructorTest extends TestCase {
+
+    NoPublicConstructorTest() {
+    }
+
+    public NoPublicConstructorTest(String foo, String foo2) {
+    }
+
+    public void testNotRun() {
+        fail("method in NoPublicConstructorTest run unexpectedly");
+    }
+}

test-runner/tests/src/android/test/suitebuilder/examples/constructor/ProtectedConstructorTest.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.test.suitebuilder.examples.constructor;
+
+import junit.framework.TestCase;
+
+/**
+ * A protected constructor test case that should not be loaded.
+ */
+public class ProtectedConstructorTest extends TestCase {
+
+    protected ProtectedConstructorTest() {
+    }
+
+    public void testNotRun() {
+        fail("method in ProtectedConstructorTest run unexpectedly");
+    }
+
+}

test-runner/tests/src/android/test/suitebuilder/examples/constructor/PublicConstructorTest.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.test.suitebuilder.examples.constructor;
+
+import junit.framework.TestCase;
+
+/**
+ * A public constructor test case that should be loaded.
+ */
+public class PublicConstructorTest extends TestCase {
+
+    public void testPublicConstructor() {
+    }
+}