runner/src/androidTest/java/android/support/test/MyParameterizedTest.java

/*
 * Copyright (C) 2014 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.support.test;

import android.app.Instrumentation;
import android.test.suitebuilder.annotation.SmallTest;

import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

import java.util.Arrays;
import java.util.Collection;

/**
 * Placeholder to verify {@link Instrumentation} can be injected into {@link Parameterized} tests
 */
@RunWith(Parameterized.class)
@SmallTest
public class MyParameterizedTest {

    @Parameters(name = "{index}: fib({0})={1}")
    public static Collection<Object[]> data() {
        return Arrays.asList(new Object[][]{
                {0, 0}, {1, 1}, {2, 1}, {3, 2}, {4, 3}, {5, 5}, {6, 8}
        });
    }

    private final int mInput;
    private final int mExpected;

    public MyParameterizedTest(int input, int expected) {
        mInput = input;
        mExpected = expected;
    }

    @Test
    public void testFib() {
        Assert.assertEquals(mExpected, fibonacci(mInput));
        // verify Instrumentation was injected in a Parameterized test
        Assert.assertNotNull(InstrumentationRegistry.getInstrumentation());
    }

    private int fibonacci(int n) {
        if (n == 0 || n == 1)
            return n;
        else
            return fibonacci(n - 1) + fibonacci(n - 2);
    }
}