/*
 * Copyright (C) 2008 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;

import android.test.mock.MockContext;
import android.test.suitebuilder.annotation.SmallTest;

import java.util.ArrayList;
import junit.framework.TestCase;
import junit.framework.AssertionFailedError;
import junit.framework.Test;
import junit.framework.TestSuite;
import junit.framework.TestListener;

import java.util.List;
import java.util.Arrays;

/**
 * Unit tests for {@link AndroidTestRunner}
 */
@SmallTest
public class AndroidTestRunnerTest extends TestCase {
    private AndroidTestRunner mAndroidTestRunner;
    private StubContext mStubContext;

    @Override
    protected void setUp() throws Exception {
        super.setUp();
        mStubContext = new StubContext(getClass().getClassLoader());

        mAndroidTestRunner = new AndroidTestRunner();
        mAndroidTestRunner.setContext(mStubContext);
    }

    public void testLoadNoTestCases() throws Exception {
        mAndroidTestRunner.setTestClassName(TestSuite.class.getName(), null);

        List<TestCase> testCases = mAndroidTestRunner.getTestCases();
        assertNotNull(testCases);
        assertEquals(1, testCases.size());
        assertEquals("warning", testCases.get(0).getName());
        assertEquals(TestSuite.class.getSimpleName(), mAndroidTestRunner.getTestClassName());
    }

    public void testSetTestSuiteWithOneTestCase() throws Exception {
        mAndroidTestRunner.setTestClassName(OneTestTestCase.class.getName(), null);

        List<TestCase> testCases = mAndroidTestRunner.getTestCases();
        assertNotNull(testCases);
        assertEquals(1, testCases.size());
        assertEquals("testOne", testCases.get(0).getName());
        assertEquals(OneTestTestCase.class.getSimpleName(), mAndroidTestRunner.getTestClassName());
    }

    public void testRunTest() throws Exception {
        mAndroidTestRunner.setTestClassName(OneTestTestCase.class.getName(), null);

        TestListenerStub testListenerStub = new TestListenerStub();
        mAndroidTestRunner.addTestListener(testListenerStub);

        mAndroidTestRunner.runTest();

        assertTrue(testListenerStub.saw("testOne"));
    }

    public void testRunTestWithAndroidTestCase() throws Exception {
        mAndroidTestRunner.setTestClassName(
                OneAndroidTestTestCase.class.getName(), "testOneAndroid");

        TestListenerStub testListenerStub = new TestListenerStub();
        mAndroidTestRunner.addTestListener(testListenerStub);

        assertNull(((AndroidTestCase) mAndroidTestRunner.getTestCases().get(0)).getContext());

        mAndroidTestRunner.runTest();

        assertTrue(testListenerStub.saw("testOneAndroid"));
        assertSame(mStubContext,
                ((AndroidTestCase) mAndroidTestRunner.getTestCases().get(0)).getContext());
    }

    public void testRunTestWithAndroidTestCaseInSuite() throws Exception {
        mAndroidTestRunner.setTestClassName(OneAndroidTestTestCase.class.getName(), null);

        TestListenerStub testListenerStub = new TestListenerStub();
        mAndroidTestRunner.addTestListener(testListenerStub);

        mAndroidTestRunner.runTest();

        assertTrue(testListenerStub.saw("testOneAndroid"));

        List<TestCase> testCases = mAndroidTestRunner.getTestCases();
        for (TestCase testCase : testCases) {
            assertSame(mStubContext, ((AndroidTestCase) testCase).getContext());
        }
    }

    public void testRunTestWithAndroidTestCaseInNestedSuite() throws Exception {
        mAndroidTestRunner.setTestClassName(AndroidTestCaseTestSuite.class.getName(), null);

        TestListenerStub testListenerStub = new TestListenerStub();
        mAndroidTestRunner.addTestListener(testListenerStub);

        mAndroidTestRunner.runTest();

        assertTrue(testListenerStub.saw("testOneAndroid"));

        List<TestCase> testCases = mAndroidTestRunner.getTestCases();
        for (TestCase testCase : testCases) {
            assertSame(mStubContext, ((AndroidTestCase) testCase).getContext());
        }
    }

    public void testRunTestWithNullListener() throws Exception {
        mAndroidTestRunner.setTestClassName(OneTestTestCase.class.getName(), null);

        mAndroidTestRunner.addTestListener(null);
        try {
            mAndroidTestRunner.runTest();
        } catch (NullPointerException e) {
            fail("Should not add a null TestListener");
        }
    }

    public void testSetTestClassWithTestSuiteProvider() throws Exception {
        mAndroidTestRunner.setTestClassName(SampleTestSuiteProvider.class.getName(), null);
        List<TestCase> testCases = mAndroidTestRunner.getTestCases();
        List<String> testNames = new ArrayList<>();
        for (TestCase testCase : testCases) {
            testNames.add(testCase.getName());
        }

        // Use the test suite provided by the interface method rather than the static suite method.
        assertEquals(Arrays.asList("testOne"), testNames);
    }

    public void testSetTestClassWithTestSuite() throws Exception {
        mAndroidTestRunner.setTestClassName(SampleTestSuite.class.getName(), null);
        List<TestCase> testCases = mAndroidTestRunner.getTestCases();
        List<String> testNames = new ArrayList<>();
        for (TestCase testCase : testCases) {
            testNames.add(testCase.getName());
        }
        assertEquals(Arrays.asList("testOne", "testOne", "testTwo"), testNames);
    }

    public void testRunSingleTestMethod() throws Exception {
        String testMethodName = "testTwo";
        mAndroidTestRunner.setTestClassName(TwoTestTestCase.class.getName(), testMethodName);
        List<TestCase> testCases = mAndroidTestRunner.getTestCases();
        List<String> testNames = new ArrayList<>();
        for (TestCase testCase : testCases) {
            testNames.add(testCase.getName());
        }
        assertEquals(Arrays.asList(testMethodName), testNames);
    }

    public void testSetTestClassInvalidClass() throws Exception {
        try {
            mAndroidTestRunner.setTestClassName("class.that.does.not.exist", null);
            fail("expected exception not thrown");
        } catch (RuntimeException e) {
            // expected
        }
    }
    
    public void testRunSkipExecution() throws Exception {
        String testMethodName = "testFail";
        mAndroidTestRunner.setTestClassName(
                OnePassOneErrorOneFailTestCase.class.getName(), testMethodName);
        
        TestListenerStub testListenerStub = new TestListenerStub();
        mAndroidTestRunner.addTestListener(testListenerStub);
        
        // running the failing test should pass - ie as if its not run
        mAndroidTestRunner.runTest();
        
        assertTrue(testListenerStub.saw("testFail"));
    }

    public static class SampleTestSuiteProvider implements TestSuiteProvider {

        public TestSuite getTestSuite() {
            TestSuite testSuite = new TestSuite();
            testSuite.addTestSuite(OneTestTestCase.class);
            return testSuite;
        }

        public static Test suite() {
            return SampleTestSuite.suite();
        }
    }

    public static class SampleTestSuite {
        public static TestSuite suite() {
            TestSuite testSuite = new TestSuite();
            testSuite.addTestSuite(OneTestTestCase.class);
            testSuite.addTestSuite(TwoTestTestCase.class);
            return testSuite;
        }
    }

    public static class AndroidTestCaseTestSuite {
        public static TestSuite suite() {
            TestSuite testSuite = new TestSuite();
            testSuite.addTestSuite(OneAndroidTestTestCase.class);
            return testSuite;
        }
    }

    public static class OneAndroidTestTestCase extends AndroidTestCase {
        public void testOneAndroid() throws Exception {
        }
    }

    public static class OneTestTestCase extends TestCase {
        public void testOne() throws Exception {
        }
    }

    public static class TwoTestTestCase extends TestCase {
        public void testOne() throws Exception {
        }

        public void testTwo() throws Exception {
        }
    }

    public static class OnePassOneErrorOneFailTestCase extends TestCase {
        public void testPass() throws Exception {
        }

        public void testError() throws Exception {
            throw new Exception();
        }

        public void testFail() throws Exception {
            fail();
        }
    }

    private static class TestListenerStub implements TestListener {
        List<String> testNames = new ArrayList<>();

        public void addError(Test test, Throwable t) {
        }

        public void addFailure(Test test, AssertionFailedError t) {
        }

        public void endTest(Test test) {
        }

        public void startTest(Test test) {
            if (test instanceof TestCase) {
                testNames.add(((TestCase) test).getName());
            } else if (test instanceof TestSuite) {
                testNames.add(((TestSuite) test).getName());
            }
        }

        public boolean saw(String testName) {
            return testNames.contains(testName);
        }
    }

    private static class StubContext extends MockContext {
        private ClassLoader mClassLoader;

        public StubContext(ClassLoader classLoader) {
            this.mClassLoader = classLoader;
        }

        @Override
        public ClassLoader getClassLoader() {
            return mClassLoader;
        }
    }
}