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package org.junit.tests.running.classes;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import static org.junit.experimental.results.PrintableResult.testResult;
import static org.junit.matchers.JUnitMatchers.containsString;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.Description;
import org.junit.runner.JUnitCore;
import org.junit.runner.Request;
import org.junit.runner.Result;
import org.junit.runner.RunWith;
import org.junit.runner.Runner;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;
import org.junit.runners.model.InitializationError;
public class ParameterizedTestTest {
@RunWith(Parameterized.class)
static public class FibonacciTest {
@Parameters
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 int fInput;
private int fExpected;
public FibonacciTest(int input, int expected) {
fInput= input;
fExpected= expected;
}
@Test
public void test() {
assertEquals(fExpected, fib(fInput));
}
private int fib(int x) {
return 0;
}
}
@Test
public void count() {
Result result= JUnitCore.runClasses(FibonacciTest.class);
assertEquals(7, result.getRunCount());
assertEquals(6, result.getFailureCount());
}
@Test
public void failuresNamedCorrectly() {
Result result= JUnitCore.runClasses(FibonacciTest.class);
assertEquals(String
.format("test[1](%s)", FibonacciTest.class.getName()), result
.getFailures().get(0).getTestHeader());
}
@Test
public void countBeforeRun() throws Exception {
Runner runner= Request.aClass(FibonacciTest.class).getRunner();
assertEquals(7, runner.testCount());
}
@Test
public void plansNamedCorrectly() throws Exception {
Runner runner= Request.aClass(FibonacciTest.class).getRunner();
Description description= runner.getDescription();
assertEquals("[0]", description.getChildren().get(0).getDisplayName());
}
private static String fLog;
@RunWith(Parameterized.class)
static public class BeforeAndAfter {
@BeforeClass
public static void before() {
fLog+= "before ";
}
@AfterClass
public static void after() {
fLog+= "after ";
}
public BeforeAndAfter(int x) {
}
@Parameters
public static Collection<Object[]> data() {
return Arrays.asList(new Object[][] { { 3 } });
}
@Test
public void aTest() {
}
}
@Test
public void beforeAndAfterClassAreRun() {
fLog= "";
JUnitCore.runClasses(BeforeAndAfter.class);
assertEquals("before after ", fLog);
}
@RunWith(Parameterized.class)
static public class EmptyTest {
@BeforeClass
public static void before() {
fLog+= "before ";
}
@AfterClass
public static void after() {
fLog+= "after ";
}
}
@Test
public void validateClassCatchesNoParameters() {
Result result= JUnitCore.runClasses(EmptyTest.class);
assertEquals(1, result.getFailureCount());
}
@RunWith(Parameterized.class)
static public class IncorrectTest {
@Test
public int test() {
return 0;
}
@Parameters
public static Collection<Object[]> data() {
return Collections.singletonList(new Object[] {1});
}
}
@Test
public void failuresAddedForBadTestMethod() throws Exception {
Result result= JUnitCore.runClasses(IncorrectTest.class);
assertEquals(1, result.getFailureCount());
}
@RunWith(Parameterized.class)
static public class ProtectedParametersTest {
@Parameters
protected static Collection<Object[]> data() {
return Collections.emptyList();
}
@Test
public void aTest() {
}
}
@Test
public void meaningfulFailureWhenParametersNotPublic() throws Exception {
Result result= JUnitCore.runClasses(ProtectedParametersTest.class);
String expected= String.format(
"No public static parameters method on class %s",
ProtectedParametersTest.class.getName());
assertEquals(expected, result.getFailures().get(0).getMessage());
}
@RunWith(Parameterized.class)
static public class WrongElementType {
@Parameters
public static Collection<String> data() {
return Arrays.asList("a", "b", "c");
}
@Test
public void aTest() {
}
}
@Test
public void meaningfulFailureWhenParameterListsAreNotArrays() {
String expected= String.format(
"%s.data() must return a Collection of arrays.",
WrongElementType.class.getName());
assertThat(testResult(WrongElementType.class).toString(),
containsString(expected));
}
@RunWith(Parameterized.class)
static public class PrivateConstructor {
private PrivateConstructor(int x) {
}
@Parameters
public static Collection<Object[]> data() {
return Arrays.asList(new Object[][] { { 3 } });
}
@Test
public void aTest() {
}
}
@Test(expected=InitializationError.class)
public void exceptionWhenPrivateConstructor() throws Throwable {
new Parameterized(PrivateConstructor.class);
}
}
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