ContinuousIntegration/TDD-Mocking/src/test/java/de/edu/hsfulda/ciip/tdd/GameCellTest.java

package de.edu.hsfulda.ciip.tdd;

import static org.mockito.Mockito.any;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.junit.Assert.*;
import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

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

import org.hamcrest.CoreMatchers;
import org.junit.Rule;
import org.junit.Test;
import org.mockito.ArgumentCaptor;
import org.mockito.Mock;
import org.mockito.junit.MockitoJUnit;
import org.mockito.junit.MockitoRule;

public class GameCellTest {

	@Rule
	public MockitoRule mockitoRule = MockitoJUnit.rule();

	@Mock
	State initialState;

	@Mock
	State changedState;

	@Test
	public void reportsInitiallyProvidesState() {
		GameCell cell = new GameCell(initialState);

		State result = cell.getState();

		assertThat("initial state returned", result, equalTo(initialState));
	}

	@Test
	public void changesStateWhenRequested() {
		GameCell cell = new GameCell(initialState);
		when(initialState.nextBy(any(List.class))).thenReturn(changedState);

		cell.calculateNextGen();
		verify(initialState).nextBy(any(List.class));

		cell.activateNextGeneration();
		State result = cell.getState();
		assertThat("initial state returned", result, equalTo(changedState));
	}

	@SuppressWarnings("unchecked")
	@Test

	public void passesNeigbourStatesForStateChangeCalculation() {
		GameCell cell = new GameCell(initialState);
		List<State> neighborStates = Arrays.asList(mock(State.class), mock(State.class), mock(State.class),
				mock(State.class));
		for (State state : neighborStates) {
			cell.addNeigbour(new GameCell(state));
		}

		cell.calculateNextGen();
		ArgumentCaptor<List> passedStates = ArgumentCaptor.forClass(List.class);
		verify(initialState).nextBy(passedStates.capture());
		
		List<State> statesPassed = passedStates.getValue();
		for (State state : neighborStates) {
			assertThat(statesPassed, CoreMatchers.hasItem(state));
		}
	}

}