org.junit.runner
Class Description

java.lang.Object
  extended by org.junit.runner.Description
All Implemented Interfaces:
Serializable

public class Description
extends Object
implements Serializable

A Description describes a test which is to be run or has been run. Descriptions can be atomic (a single test) or compound (containing children tests). Descriptions are used to provide feedback about the tests that are about to run (for example, the tree view visible in many IDEs) or tests that have been run (for example, the failures view).

Descriptions are implemented as a single class rather than a Composite because they are entirely informational. They contain no logic aside from counting their tests.

In the past, we used the raw TestCases and TestSuites to display the tree of tests. This was no longer viable in JUnit 4 because atomic tests no longer have a superclass below Object. We needed a way to pass a class and name together. Description emerged from this.

Since:
4.0
See Also:
Request, Runner, Serialized Form

Field Summary
static Description EMPTY
          Describes a Runner which runs no tests
static Description TEST_MECHANISM
          Describes a step in the test-running mechanism that goes so wrong no other description can be used (for example, an exception thrown from a Runner's constructor
 
Method Summary
 void addChild(Description description)
          Add Description as a child of the receiver.
 Description childlessCopy()
           
static Description createSuiteDescription(Class<?> testClass)
          Create a Description named after testClass
static Description createSuiteDescription(String name, Annotation... annotations)
          Create a Description named name.
static Description createSuiteDescription(String name, Serializable uniqueId, Annotation... annotations)
          Create a Description named name.
static Description createTestDescription(Class<?> clazz, String name)
          Create a Description of a single test named name in the class clazz.
static Description createTestDescription(Class<?> clazz, String name, Annotation... annotations)
          Create a Description of a single test named name in the class clazz.
static Description createTestDescription(String className, String name, Annotation... annotations)
          Create a Description of a single test named name in the 'class' named className.
static Description createTestDescription(String className, String name, Serializable uniqueId)
          Create a Description of a single test named name in the class clazz.
 boolean equals(Object obj)
           
<T extends Annotation>
T
getAnnotation(Class<T> annotationType)
           
 Collection<Annotation> getAnnotations()
           
 ArrayList<Description> getChildren()
          Gets the copy of the children of this Description.
 String getClassName()
           
 String getDisplayName()
           
 String getMethodName()
           
 Class<?> getTestClass()
           
 int hashCode()
           
 boolean isEmpty()
           
 boolean isSuite()
           
 boolean isTest()
           
 int testCount()
           
 String toString()
           
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

EMPTY

public static final Description EMPTY
Describes a Runner which runs no tests


TEST_MECHANISM

public static final Description TEST_MECHANISM
Describes a step in the test-running mechanism that goes so wrong no other description can be used (for example, an exception thrown from a Runner's constructor

Method Detail

createSuiteDescription

public static Description createSuiteDescription(String name,
                                                 Annotation... annotations)
Create a Description named name. Generally, you will add children to this Description.

Parameters:
name - the name of the Description
annotations - meta-data about the test, for downstream interpreters
Returns:
a Description named name

createSuiteDescription

public static Description createSuiteDescription(String name,
                                                 Serializable uniqueId,
                                                 Annotation... annotations)
Create a Description named name. Generally, you will add children to this Description.

Parameters:
name - the name of the Description
uniqueId - an arbitrary object used to define uniqueness (in equals(Object)
annotations - meta-data about the test, for downstream interpreters
Returns:
a Description named name

createTestDescription

public static Description createTestDescription(String className,
                                                String name,
                                                Annotation... annotations)
Create a Description of a single test named name in the 'class' named className. Generally, this will be a leaf Description. This method is a better choice than createTestDescription(Class, String, Annotation...) for test runners whose test cases are not defined in an actual Java Class.

Parameters:
className - the class name of the test
name - the name of the test (a method name for test annotated with Test)
annotations - meta-data about the test, for downstream interpreters
Returns:
a Description named name

createTestDescription

public static Description createTestDescription(Class<?> clazz,
                                                String name,
                                                Annotation... annotations)
Create a Description of a single test named name in the class clazz. Generally, this will be a leaf Description.

Parameters:
clazz - the class of the test
name - the name of the test (a method name for test annotated with Test)
annotations - meta-data about the test, for downstream interpreters
Returns:
a Description named name

createTestDescription

public static Description createTestDescription(Class<?> clazz,
                                                String name)
Create a Description of a single test named name in the class clazz. Generally, this will be a leaf Description. (This remains for binary compatibility with clients of JUnit 4.3)

Parameters:
clazz - the class of the test
name - the name of the test (a method name for test annotated with Test)
Returns:
a Description named name

createTestDescription

public static Description createTestDescription(String className,
                                                String name,
                                                Serializable uniqueId)
Create a Description of a single test named name in the class clazz. Generally, this will be a leaf Description.

Parameters:
name - the name of the test (a method name for test annotated with Test)
Returns:
a Description named name

createSuiteDescription

public static Description createSuiteDescription(Class<?> testClass)
Create a Description named after testClass

Parameters:
testClass - A Class containing tests
Returns:
a Description of testClass

getDisplayName

public String getDisplayName()
Returns:
a user-understandable label

addChild

public void addChild(Description description)
Add Description as a child of the receiver.

Parameters:
description - the soon-to-be child.

getChildren

public ArrayList<Description> getChildren()
Gets the copy of the children of this Description. Returns an empty list if there are no children.


isSuite

public boolean isSuite()
Returns:
true if the receiver is a suite

isTest

public boolean isTest()
Returns:
true if the receiver is an atomic test

testCount

public int testCount()
Returns:
the total number of atomic tests in the receiver

hashCode

public int hashCode()
Overrides:
hashCode in class Object

equals

public boolean equals(Object obj)
Overrides:
equals in class Object

toString

public String toString()
Overrides:
toString in class Object

isEmpty

public boolean isEmpty()
Returns:
true if this is a description of a Runner that runs no tests

childlessCopy

public Description childlessCopy()
Returns:
a copy of this description, with no children (on the assumption that some of the children will be added back)

getAnnotation

public <T extends Annotation> T getAnnotation(Class<T> annotationType)
Returns:
the annotation of type annotationType that is attached to this description node, or null if none exists

getAnnotations

public Collection<Annotation> getAnnotations()
Returns:
all of the annotations attached to this description node

getTestClass

public Class<?> getTestClass()
Returns:
If this describes a method invocation, the class of the test instance.

getClassName

public String getClassName()
Returns:
If this describes a method invocation, the name of the class of the test instance

getMethodName

public String getMethodName()
Returns:
If this describes a method invocation, the name of the method (or null if not)


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