/*
* Copyright 2003-2013 the original author or authors.
*
* 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 groovy.test;
import groovy.lang.Closure;
import groovy.lang.GroovyRuntimeException;
import groovy.lang.GroovyShell;
import org.codehaus.groovy.runtime.ScriptBytecodeAdapter;
import org.junit.Test;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Logger;
/**
* <p>{@code GroovyAssert} contains a set of static assertion and test helper methods and is supposed to be a Groovy
* extension of JUnit 4's {@link org.junit.Assert} class. In case JUnit 3 is the choice, the {@link groovy.util.GroovyTestCase}
* is meant to be used for writing tests based on {@link junit.framework.TestCase}.
* </p>
*
* <p>
* {@code GroovyAssert} methods can either be used by fully qualifying the static method like
*
* <pre>
* groovy.test.GroovyAssert.shouldFail { ... }
* </pre>
*
* or by importing the static methods with one ore more static imports
*
* <pre>
* import static groovy.test.GroovyAssert.shouldFail
* import static groovy.test.GroovyAssert.assertNotNull
* </pre>
* </p>
*
* @see groovy.util.GroovyTestCase
*
* @author Paul King
* @author Andre Steingress
*
* @since 2.3
*/
public class GroovyAssert extends org.junit.Assert {
private static final Logger log = Logger.getLogger(GroovyAssert.class.getName());
private static final int MAX_NESTED_EXCEPTIONS = 10;
private static final AtomicInteger counter = new AtomicInteger(0);
public static final String TEST_SCRIPT_NAME_PREFIX = "TestScript";
/**
* @return a generic script name to be used by {@code GroovyShell#evaluate} calls.
*/
protected static String genericScriptName() {
return TEST_SCRIPT_NAME_PREFIX + (counter.getAndIncrement()) + ".groovy";
}
/**
* Asserts that the script runs without any exceptions
*
* @param script the script that should pass without any exception thrown
*/
public static void assertScript(final String script) throws Exception {
GroovyShell shell = new GroovyShell();
shell.evaluate(script, genericScriptName());
}
/**
* Asserts that the given code closure fails when it is evaluated
*
* @param code the code expected to fail
* @return the caught exception
*/
public static Throwable shouldFail(Closure code) {
boolean failed = false;
Throwable th = null;
try {
code.call();
} catch (GroovyRuntimeException gre) {
failed = true;
th = ScriptBytecodeAdapter.unwrap(gre);
} catch (Throwable e) {
failed = true;
th = e;
}
assertTrue("Closure " + code + " should have failed", failed);
return th;
}
/**
* Asserts that the given code closure fails when it is evaluated
* and that a particular type of exception is thrown.
*
* @param clazz the class of the expected exception
* @param code the closure that should fail
* @return the caught exception
*/
public static Throwable shouldFail(Class clazz, Closure code) {
Throwable th = null;
try {
code.call();
} catch (GroovyRuntimeException gre) {
th = ScriptBytecodeAdapter.unwrap(gre);
} catch (Throwable e) {
th = e;
}
if (th == null) {
fail("Closure " + code + " should have failed with an exception of type " + clazz.getName());
} else if (!clazz.isInstance(th)) {
fail("Closure " + code + " should have failed with an exception of type " + clazz.getName() + ", instead got Exception " + th);
}
return th;
}
/**
* Asserts that the given code closure fails when it is evaluated
* and that a particular Exception type can be attributed to the cause.
* The expected exception class is compared recursively with any nested
* exceptions using getCause() until either a match is found or no more
* nested exceptions exist.
* <p>
* If a match is found, the matching exception is returned
* otherwise the method will fail.
*
* @param expectedCause the class of the expected exception
* @param code the closure that should fail
* @return the cause
*/
public static Throwable shouldFailWithCause(Class expectedCause, Closure code) {
if (expectedCause == null) {
fail("The expectedCause class cannot be null");
}
Throwable cause = null;
Throwable orig = null;
int level = 0;
try {
code.call();
} catch (GroovyRuntimeException gre) {
orig = ScriptBytecodeAdapter.unwrap(gre);
cause = orig.getCause();
} catch (Throwable e) {
orig = e;
cause = orig.getCause();
}
if (orig != null && cause == null) {
fail("Closure " + code + " was expected to fail due to a nested cause of type " + expectedCause.getName() +
" but instead got a direct exception of type " + orig.getClass().getName() + " with no nested cause(s). Code under test has a bug or perhaps you meant shouldFail?");
}
while (cause != null && !expectedCause.isInstance(cause) && cause != cause.getCause() && level < MAX_NESTED_EXCEPTIONS) {
cause = cause.getCause();
level++;
}
if (orig == null) {
fail("Closure " + code + " should have failed with an exception having a nested cause of type " + expectedCause.getName());
} else if (cause == null || !expectedCause.isInstance(cause)) {
fail("Closure " + code + " should have failed with an exception having a nested cause of type " + expectedCause.getName() + ", instead found these Exceptions:\n" + buildExceptionList(orig));
}
return cause;
}
/**
* Asserts that the given script fails when it is evaluated
* and that a particular type of exception is thrown.
*
* @param clazz the class of the expected exception
* @param script the script that should fail
* @return the caught exception
*/
public static Throwable shouldFail(Class clazz, String script) {
Throwable th = null;
try {
GroovyShell shell = new GroovyShell();
shell.evaluate(script, genericScriptName());
} catch (GroovyRuntimeException gre) {
th = ScriptBytecodeAdapter.unwrap(gre);
} catch (Throwable e) {
th = e;
}
if (th == null) {
fail("Script should have failed with an exception of type " + clazz.getName());
} else if (!clazz.isInstance(th)) {
fail("Script should have failed with an exception of type " + clazz.getName() + ", instead got Exception " + th);
}
return th;
}
/**
* Asserts that the given script fails when it is evaluated
*
* @param script the script expected to fail
* @return the caught exception
*/
public static Throwable shouldFail(String script) {
boolean failed = false;
Throwable th = null;
try {
GroovyShell shell = new GroovyShell();
shell.evaluate(script, genericScriptName());
} catch (GroovyRuntimeException gre) {
failed = true;
th = ScriptBytecodeAdapter.unwrap(gre);
} catch (Throwable e) {
failed = true;
th = e;
}
assertTrue("Script should have failed", failed);
return th;
}
/**
* NotYetImplemented Implementation
*/
private static final ThreadLocal<Boolean> notYetImplementedFlag = new ThreadLocal<Boolean>();
/**
* From JUnit. Finds from the call stack the active running JUnit test case
*
* @return the test case method
* @throws RuntimeException if no method could be found.
*/
private static Method findRunningJUnitTestMethod(Class caller) {
final Class[] args = new Class[]{};
// search the initial junit test
final Throwable t = new Exception();
for (int i = t.getStackTrace().length - 1; i >= 0; --i) {
final StackTraceElement element = t.getStackTrace()[i];
if (element.getClassName().equals(caller.getName())) {
try {
final Method m = caller.getMethod(element.getMethodName(), args);
if (isPublicTestMethod(m)) {
return m;
}
}
catch (final Exception e) {
// can't access, ignore it
}
}
}
throw new RuntimeException("No JUnit test case method found in call stack");
}
/**
* From Junit. Test if the method is a JUnit 3 or 4 test.
*
* @param method the method
* @return <code>true</code> if this is a junit test.
*/
private static boolean isPublicTestMethod(final Method method) {
final String name = method.getName();
final Class[] parameters = method.getParameterTypes();
final Class returnType = method.getReturnType();
return parameters.length == 0
&& (name.startsWith("test") || method.getAnnotation(Test.class) != null)
&& returnType.equals(Void.TYPE)
&& Modifier.isPublic(method.getModifiers());
}
/**
* <p>
* Runs the calling JUnit test again and fails only if it unexpectedly runs.<br>
* This is helpful for tests that don't currently work but should work one day,
* when the tested functionality has been implemented.<br>
* </p>
*
* <p>
* The right way to use it for JUnit 3 is:
*
* <pre>
* public void testXXX() {
* if (GroovyTestCase.notYetImplemented(this)) return;
* ... the real (now failing) unit test
* }
* </pre>
*
* or for JUnit 4
*
* <pre>
* @Test
* public void XXX() {
* if (GroovyTestCase.notYetImplemented(this)) return;
* ... the real (now failing) unit test
* }
* </pre>
* </p>
*
* <p>
* Idea copied from HtmlUnit (many thanks to Marc Guillemot).
* Future versions maybe available in the JUnit distribution.
* </p>
*
* @return {@code false} when not itself already in the call stack
*/
public static boolean notYetImplemented(Object caller) {
if (notYetImplementedFlag.get() != null) {
return false;
}
notYetImplementedFlag.set(Boolean.TRUE);
final Method testMethod = findRunningJUnitTestMethod(caller.getClass());
try {
log.info("Running " + testMethod.getName() + " as not yet implemented");
testMethod.invoke(caller, (Object[]) new Class[]{});
fail(testMethod.getName() + " is marked as not yet implemented but passes unexpectedly");
}
catch (final Exception e) {
log.info(testMethod.getName() + " fails which is expected as it is not yet implemented");
// method execution failed, it is really "not yet implemented"
}
finally {
notYetImplementedFlag.set(null);
}
return true;
}
private static String buildExceptionList(Throwable th) {
StringBuilder sb = new StringBuilder();
int level = 0;
while (th != null) {
if (level > 1) {
for (int i = 0; i < level - 1; i++) sb.append(" ");
}
if (level > 0) sb.append("-> ");
if (level > MAX_NESTED_EXCEPTIONS) {
sb.append("...");
break;
}
sb.append(th.getClass().getName()).append(": ").append(th.getMessage()).append("\n");
if (th == th.getCause()) {
break;
}
th = th.getCause();
level++;
}
return sb.toString();
}
}