Espresso devoxx 2014

@Tom404_#Devoxx #AndroidEspresso

Espresso: What else ?Thomas Guerin Xebia France



“My tests last hours !”



“Testing is sometimes complicated !”




“My tests randomly fail !”





“I have to fix the tests for a simple modification in my code”

















A test must be …


A test must be …

Simple


A test must be …

FastSimple


A test must be …

FastSimple Reliable


A test must be …

FastSimple Reliable Durable


// Start the main activity of the application under test mActivity = getActivity();

// Get a handle to the Activity object's main UI widget, a Spinner mSpinner = (Spinner)mActivity.findViewById(com.android.example.spinner.R.id.Spinner01);

// Set the Spinner to a known position mActivity.setSpinnerPosition(TEST_STATE_DESTROY_POSITION);

// Stop the activity -‐ The onDestroy() method should save the state of the Spinner mActivity.finish();

// Re-‐start the Activity -‐ the onResume() method should restore the state of the Spinner mActivity = getActivity();

// Get the Spinner's current position int currentPosition = mActivity.getSpinnerPosition();

// Assert that the current position is the same as the starting position assertEquals(TEST_STATE_DESTROY_POSITION, currentPosition);

Bad example


// Start the main activity of the application under test mActivity = getActivity();

// Get a handle to the Activity object's main UI widget, a Spinner mSpinner = (Spinner)mActivity.findViewById(com.android.example.spinner.R.id.Spinner01);

// Set the Spinner to a known position mActivity.setSpinnerPosition(TEST_STATE_DESTROY_POSITION);

// Stop the activity -‐ The onDestroy() method should save the state of the Spinner mActivity.finish();

// Re-‐start the Activity -‐ the onResume() method should restore the state of the Spinner mActivity = getActivity();

// Get the Spinner's current position int currentPosition = mActivity.getSpinnerPosition();

// Assert that the current position is the same as the starting position assertEquals(TEST_STATE_DESTROY_POSITION, currentPosition);

Bad example


Robotium


API Overview


API Overview

Solo

getView(int viewId)

drag(…)

clickInList(int line, int index)

goBack()setNavigationDrawer(int status)pressSoftKeyboardNextButton()

clickOnActionBarItem(int id)

scrollToBottom() searchEditText(String text)

pressSoftKeyboardSearchButton()

getButton(int index)scrollDown()clearEditText(int index)

clickOnToggleButton(String text)

clickOnImageButton(int index)

clickOnButton(int index)

pressMenuItem(int index)

clickOnActionBarHome()

scrollDownList(int index)

searchText(String text)


solo.clickOnView(R.id.start_activity_button);

// Wait for a specific condition to occur solo.waitForCondition(new Condition() { @Override public boolean isSatisfied() { return checkConditionInNewActivity(); } }, Timeout.getSmallTimeout());

solo.clickOnView(R.id.view_in_new_activity);

Basic example


solo.clickOnView(R.id.start_activity_button);

// Wait for a specific condition to occur solo.waitForCondition(new Condition() { @Override public boolean isSatisfied() { return checkConditionInNewActivity(); } }, Timeout.getSmallTimeout());

solo.clickOnView(R.id.view_in_new_activity);

Basic example


Robotium drawbacksFlaky tests

Hard to extend

View index based methods

Errors not meaningful


Espresso


Hamcrest


HamcrestLibrary of matchers



assertThat("Hello", equalTo("Hello"))

// Syntaxic sugar assertThat("Hello", is("Hello"))

// A lot of matchers available allOf not instanceOf hasProperty equalToIgnoringCase



assertThat("Hello", equalTo("Hello"))

// Syntaxic sugar assertThat("Hello", is("Hello"))

// A lot of matchers available allOf not instanceOf hasProperty equalToIgnoringCase

Easy to compose


public static Matcher<View> isVisible() { return new TypeSafeMatcher<View>() { @Override public void describeTo(Description description) { description.appendText("is view visible"); }

@Override public boolean matchesSafely(View view) { return view.getVisibility() == View.VISIBLE; } }; }

Custom matcher


API overview


API overview

onView(Matcher<View>)onData(Matcher<Object>

Espresso


API overview


Espresso withId()withText(text)

hasSibling(Matcher<View>)

ViewMatchers


API overview


Espresso

perform(ViewAction)check(ViewAssertion)

ViewInteraction / DataInteraction

withId()withText(text)


ViewMatchers


API overview


Espresso



click()typeText(text)

ViewActions



ViewMatchers


API overview


Espresso



click()typeText(text)

ViewActions

doesNotExist()matches(Matcher<View>)

ViewAssertions



ViewMatchers


Goodbye flakiness


Goodbye flakinessFor each test action, Espresso will :



1. Wait until the app is idle



1. Wait until the app is idle2. Run on the UI thread



1. Wait until the app is idle2. Run on the UI thread3. Wait until completion



1. Wait until the app is idle2. Run on the UI thread3. Wait until completion4. Check the result



1. Wait until the app is idle2. Run on the UI thread3. Wait until completion4. Check the result

Demo


Date post:	05-Jul-2015
Category:	Software
Upload:	xebia-france
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Espresso devoxx 2014

Software