## com.google.gwt.junit.client
Class GWTTestCase

    java.lang.Object
      junit.framework.Assert
          junit.framework.TestCase
              com.google.gwt.junit.client.GWTTestCase

All Implemented Interfaces:
  junit.framework.Test

Direct Known Subclasses:
  Benchmark

    public abstract class GWTTestCase

extends junit.framework.TestCase

Acts as a bridge between the JUnit environment and the GWT environment. We hook the run method and stash the TestResult object for later communication between the test runner and the unit test shell that drives the test case inside a hosted browser.

There are two versions of this class. This version is the binary version that derives from JUnit's `TestCase` and handles all the work of starting up the GWT environment. The other version is a translatable class that is used within the browser. See the `translatable` subpackage for the translatable implementation.

Field Summary
`protected junit.framework.TestResult` | `testResult`

Constructor Summary
`GWTTestCase()` A new instance of your subclass is constructed for each test method that is to be run.

Method Summary
`void` | `addCheckpoint(java.lang.String msg)` Deprecated. This method will be removed when web mode supports stack traces. It can be useful for debugging web mode failures, but production code should not depend on it.
`boolean` | `catchExceptions()` Determines whether or not exceptions will be caught by the test fixture.
`void` | `clearCheckpoints()` Deprecated. This method will be removed if and when web mode supports stack traces. It can be useful for debugging web mode failures, but production code should not depend on it
`protected void` | `delayTestFinish(int timeoutMillis)` Put the current test in asynchronous mode.
`protected void` | `finishTest()` Cause this test to succeed during asynchronous mode.
`java.lang.String[]` | `getCheckpoints()` Deprecated. This method will be removed if and when web mode supports stack traces. It can be useful for debugging web mode failures, but production code should not depend on it
`abstract java.lang.String` | `getModuleName()` Specifies a module to use when running this test case.
`protected void` | `gwtSetUp()` A replacement for JUnit's `setUp()` method.
`protected void` | `gwtTearDown()` A replacement for JUnit's `tearDown()` method.
`void` | `run(junit.framework.TestResult result)` Stashes `result` so that it can be accessed during `runTest()`.
`protected void` | `runTest()` Runs the test via the `JUnitShell` environment.
`protected void` | `setUp()` This method has been made final to prevent you from accidentally running client code outside of the GWT environment.
`protected boolean` | `supportsAsync()` Returns true if this test case supports asynchronous mode.
`protected void` | `tearDown()` This method has been made final to prevent you from accidentally running client code outside of the GWT environment.

Methods inherited from class junit.framework.TestCase
`countTestCases, createResult, getName, run, runBare, setName, toString`

Methods inherited from class junit.framework.Assert

`assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertFalse, assertFalse, assertNotNull, assertNotNull, assertNotSame, assertNotSame, assertNull, assertNull, assertSame, assertSame, assertTrue, assertTrue, fail, fail`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### testResult

    protected junit.framework.TestResult testResult

Constructor Detail

### GWTTestCase

    public GWTTestCase()

  A new instance of your subclass is constructed for each test method that is to be run. You should avoid running code in your subclass constructor, initializer blocks, and field initializations, because if those code blocks must be runnable outside of the GWT environment. As an example of what could go wrong if you run code there, trying to run a JSNI method could generate an `UnsatisfiedLinkError`, and trying to call `GWT.create(Class)` could throw an `UnsupportedOperationException`.Instead, override `gwtSetUp()` and perform any initialization code there.

Method Detail

### addCheckpoint

    @Deprecated
    public final void addCheckpoint(java.lang.String msg)

  Deprecated. This method will be removed when web mode supports stack traces. It can be useful for debugging web mode failures, but production code should not depend on it.

  Add a checkpoint message to the current test. If this test fails, all checkpoint messages will be appended to the getException description. This can be useful in web mode for determining how far test execution progressed before a failure occurs.

  Parameters:
    `msg` - the checkpoint message to add

### catchExceptions

    public boolean catchExceptions()

  Determines whether or not exceptions will be caught by the test fixture. Override this method and return `false` to let exceptions escape to the browser. This will break the normal JUnit reporting functionality, but can be useful in web mode with a JavaScript debugger to pin down where exceptions are originating.

  Returns:
    `true` for normal JUnit behavior, or `false` to disable normal JUnit getException reporting

### clearCheckpoints

    @Deprecated
    public final void clearCheckpoints()

  Deprecated. This method will be removed if and when web mode supports stack traces. It can be useful for debugging web mode failures, but production code should not depend on it

  Clears the accumulated list of checkpoint messages.

  See Also:
    `addCheckpoint(String)`

### getCheckpoints

    @Deprecated
    public final java.lang.String[] getCheckpoints()

  Deprecated. This method will be removed if and when web mode supports stack traces. It can be useful for debugging web mode failures, but production code should not depend on it

  Returns the current set of checkpoint messages.

  Returns:
    a non-`null` array of checkpoint messages
  See Also:
    `addCheckpoint(String)`

### getModuleName

    public abstract java.lang.String getModuleName()

  Specifies a module to use when running this test case. Subclasses must return the name of a module that will cause the source for that subclass to be included.

  Returns:
    the fully qualified name of a module

### run

    public final void run(junit.framework.TestResult result)

  Stashes `result` so that it can be accessed during `runTest()`.

  Specified by:
    `run` in interface `junit.framework.Test`
  Overrides:
    `run` in class `junit.framework.TestCase`

### delayTestFinish

    protected final void delayTestFinish(int timeoutMillis)

  Put the current test in asynchronous mode. If the test method completes normally, this test will not immediately succeed. Instead, a delay period begins. During the delay period, the test system will wait for one of three things to happen:
  1. If `finishTest()` is called before the delay period expires, the test will succeed.
  2. If any getException escapes from an event handler during the delay period, the test will error with the thrown getException.
  3. If the delay period expires and neither of the above has happened, the test will error with a `TimeoutException`.

  This method is typically used to test event driven functionality.

  Example:

  >     public void testTimer() {
  >       // Setup an asynchronous event handler.
  >       Timer timer = new Timer() {
  >         @Override
  >         public void run() {
  >           // do some validation logic

  >           // tell the test system the test is now done
  >           finishTest();
  >         }
  >       };

  >       // Set a delay period significantly longer than the
  >       // event is expected to take.
  >       delayTestFinish(500);

  >       // Schedule the event and return control to the test system.
  >       timer.schedule(100);
  >     }

  Parameters:
    `timeoutMillis` - how long to wait before the current test will time out
  Throws:
    `java.lang.UnsupportedOperationException` - if `supportsAsync()` is false
  See Also:
    `finishTest()`
  Tip:
    Subsequent calls to this method reset the timeout.

### finishTest

    protected final void finishTest()

  Cause this test to succeed during asynchronous mode. After calling `delayTestFinish(int)`, call this method during the delay period to cause this test to succeed. This method is typically called from an event handler some time after the test method returns control to the caller.

  Calling this method before the test method completes, will undo the effect of having called `delayTestFinish()`. The test will revert to normal, non-asynchronous mode.

  Example:

  >     public void testTimer() {
  >       // Setup an asynchronous event handler.
  >       Timer timer = new Timer() {
  >         @Override
  >         public void run() {
  >           // do some validation logic

  >           // tell the test system the test is now done
  >           finishTest();
  >         }
  >       };

  >       // Set a delay period significantly longer than the
  >       // event is expected to take.
  >       delayTestFinish(500);

  >       // Schedule the event and return control to the test system.
  >       timer.schedule(100);
  >     }

  Throws:
    `java.lang.IllegalStateException` - if this test is not in asynchronous mode
    `java.lang.UnsupportedOperationException` - if `supportsAsync()` is false
  See Also:
    `delayTestFinish(int)`

### gwtSetUp

    protected void gwtSetUp()
                     throws java.lang.Exception

  A replacement for JUnit's `setUp()` method. This method runs once per test method in your subclass, just before your each test method runs and can be used to perform initialization. Override this method instead of `setUp()`.

  Throws:
    `java.lang.Exception`

### gwtTearDown

    protected void gwtTearDown()
                        throws java.lang.Exception

  A replacement for JUnit's `tearDown()` method. This method runs once per test method in your subclass, just after your each test method runs and can be used to perform cleanup. Override this method instead of `tearDown()`.

  Throws:
    `java.lang.Exception`

### runTest

    protected void runTest()
                    throws java.lang.Throwable

  Runs the test via the `JUnitShell` environment. Do not override or call this method.

  Overrides:
    `runTest` in class `junit.framework.TestCase`
  Throws:
    `java.lang.Throwable`

### setUp

    protected final void setUp()
                        throws java.lang.Exception

  This method has been made final to prevent you from accidentally running client code outside of the GWT environment. Please override `gwtSetUp()` instead.

  Overrides:
    `setUp` in class `junit.framework.TestCase`
  Throws:
    `java.lang.Exception`

### supportsAsync

    protected boolean supportsAsync()

  Returns true if this test case supports asynchronous mode. By default, this is set to true.

### tearDown

    protected final void tearDown()
                           throws java.lang.Exception

  This method has been made final to prevent you from accidentally running client code outside of the GWT environment. Please override `gwtTearDown()` instead.

  Overrides:
    `tearDown` in class `junit.framework.TestCase`
  Throws:
    `java.lang.Exception`