/**
 * Thrown when executing a build that was expected to fail, but succeeded.
 *
 * @since 2.6
 * @see GradleRunner#buildAndFail()
 */
public class UnexpectedBuildSuccess extends UnexpectedBuildResultException {
    public UnexpectedBuildSuccess(String message, BuildResult buildResult) {
        super(message, buildResult);
    }

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gradle.testkit.runner;

/**
 * Base class for {@link UnexpectedBuildFailure} and {@link UnexpectedBuildSuccess}.
 *
 * @since 2.9
 * @see BuildResult
 */
public abstract class UnexpectedBuildResultException extends RuntimeException {

    private final BuildResult buildResult;

        given:
        buildScript helloWorldTask()

        when:
        runner('helloWorld').buildAndFail()

        then:
        def t = thrown UnexpectedBuildSuccess
        t.buildResult != null
    }

    @InspectsBuildOutput
    @InspectsGroupedOutput
    @InspectsExecutedTasks
    def "exposes result when build is expected to fail but does not"() {
        given:

        when:
        runner('helloWorld')
            .forwardStdOutput(standardOutput)
            .forwardStdError(standardError)
            .buildAndFail()

        then:
        def t = thrown UnexpectedBuildSuccess
        def result = t.buildResult
        result.output.findAll(OUT).size() == 1
        result.output.findAll(ERR).size() == 1
        standardOutput.toString().findAll(OUT).size() == 1

import org.gradle.testkit.runner.GradleRunner;
import org.gradle.testkit.runner.InvalidRunnerConfigurationException;
import org.gradle.testkit.runner.UnexpectedBuildFailure;
import org.gradle.testkit.runner.UnexpectedBuildSuccess;
import org.gradle.testkit.runner.internal.io.SynchronizedOutputStream;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Writer;

     * @throws UnexpectedBuildSuccess if the build succeeds
     * @return the build result
     */
    public abstract BuildResult buildAndFail() throws InvalidRunnerConfigurationException, UnexpectedBuildSuccess;

    /**
     * Executes a build, without expecting a particular outcome.