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CalculatorInstrumentationTest.java

/*
 * Copyright 2015, 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 com.example.android.testing.androidjunitrunnersample;

import junit.framework.TestSuite;

import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.internal.builders.AllDefaultPossibilitiesBuilder;
import org.junit.runner.RunWith;

import android.support.test.filters.LargeTest;
import android.support.test.rule.ActivityTestRule;
import android.support.test.runner.AndroidJUnit4;
import android.support.test.runner.AndroidJUnitRunner;
import android.test.ActivityInstrumentationTestCase2;

import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.action.ViewActions.click;
import static android.support.test.espresso.action.ViewActions.closeSoftKeyboard;
import static android.support.test.espresso.action.ViewActions.typeText;
import static android.support.test.espresso.assertion.ViewAssertions.matches;
import static android.support.test.espresso.matcher.ViewMatchers.withId;
import static android.support.test.espresso.matcher.ViewMatchers.withText;

/**
 * JUnit4 Ui Tests for {@link CalculatorActivity} using the {@link AndroidJUnitRunner}.
 * This class uses the JUnit4 syntax for tests.
 * <p>
 * With the new AndroidJUnit runner you can run both JUnit3 and JUnit4 tests in a single test
 * suite. The {@link AndroidRunnerBuilder} which extends JUnit's
 * {@link AllDefaultPossibilitiesBuilder} will create a single {@link
 * TestSuite} from all tests and run them.
 */
@RunWith(AndroidJUnit4.class)
@LargeTest
public class CalculatorInstrumentationTest {

/**
     * A JUnit {@link Rule @Rule} to launch your activity under test. This is a replacement
     * for {@link ActivityInstrumentationTestCase2}.
     * <p>
     * Rules are interceptors which are executed for each test method and will run before
     * any of your setup code in the {@link Before @Before} method.
     * <p>
     * {@link ActivityTestRule} will create and launch of the activity for you and also expose
     * the activity under test. To get a reference to the activity you can use
     * the {@link ActivityTestRule#getActivity()} method.
     */
    @Rule
    public ActivityTestRule<CalculatorActivity> mActivityRule = new ActivityTestRule<>(
            CalculatorActivity.class);

@Test
    public void noOperandShowsComputationError() {
        final String expectedResult = mActivityRule.getActivity().getString(R.string.computationError);
        onView(withId(R.id.operation_add_btn)).perform(click());
        onView(withId(R.id.operation_result_text_view)).check(matches(withText(expectedResult)));
    }

@Test
    public void typeOperandsAndPerformAddOperation() {
        performOperation(R.id.operation_add_btn, "16.0", "16.0", "32.0");
    }

@Test
    public void typeOperandsAndPerformSubOperation() {
        performOperation(R.id.operation_sub_btn, "32.0", "16.0", "16.0");
    }

@Test
    public void typeOperandsAndPerformDivOperation() {
        performOperation(R.id.operation_div_btn, "128.0", "16.0", "8.0");
    }

@Test
    public void divZeroForOperandTwoShowsError() {
        final String expectedResult = mActivityRule.getActivity().getString(
                R.string.computationError);
        performOperation(R.id.operation_div_btn, "128.0", "0.0", expectedResult);
    }

@Test
    public void typeOperandsAndPerformMulOperation() {
        performOperation(R.id.operation_mul_btn, "16.0", "16.0", "256.0");
    }

private void performOperation(int btnOperationResId, String operandOne,
            String operandTwo, String expectedResult) {
        // Type the two operands in the EditText fields
        onView(withId(R.id.operand_one_edit_text)).perform(typeText(operandOne),
                closeSoftKeyboard());
        onView(withId(R.id.operand_two_edit_text)).perform(typeText(operandTwo),
                closeSoftKeyboard());

// Click on a given operation button
        onView(withId(btnOperationResId)).perform(click());

// Check the expected test is displayed in the Ui
        onView(withId(R.id.operation_result_text_view)).check(matches(withText(expectedResult)));
    }

}