Filter (JUnit API 文档)

java.lang.Object
- org.junit.runner.manipulation.Filter

Direct Known Subclasses:
Categories.CategoryFilter
```
public abstract class Filter
extends Object
```
The canonical case of filtering is when you want to run a single test method in a class. Rather than introduce runner API just for that one case, JUnit provides a general filtering mechanism. If you want to filter the tests to be run, extend Filter and apply an instance of your filter to the Request before running it (see JUnitCore.run(Request). Alternatively, apply a Filter to a Runner before running tests (for example, in conjunction with RunWith.
Since:
4.0

Field Summary
Fields
Modifier and Type Field Description
static Filter ALL
A null Filter that passes all tests through.

Constructor Summary
Constructors
Constructor Description
Filter()

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`apply(Object child)`	Invoke with a `Runner` to cause all tests it intends to run to first be checked with the filter.
`abstract String`	`describe()`	Returns a textual description of this Filter
`Filter`	`intersect(Filter second)`	Returns a new Filter that accepts the intersection of the tests accepted by this Filter and `second`
`static Filter`	`matchMethodDescription(Description desiredDescription)`	Returns a `Filter` that only runs the single method described by `desiredDescription`
`abstract boolean`	`shouldRun(Description description)`

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

- Field Detail
  - ALL
```
public static final Filter ALL
```
    A null Filter that passes all tests through.
- Constructor Detail
  - Filter
```
public Filter()
```
- Method Detail
  - matchMethodDescription
```
public static Filter matchMethodDescription(Description desiredDescription)
```
    Returns a Filter that only runs the single method described by desiredDescription
  - shouldRun
```
public abstract boolean shouldRun(Description description)
```
    Parameters:
    description - the description of the test to be run
    Returns:
    true if the test should be run
  - describe
```
public abstract String describe()
```
    Returns a textual description of this Filter
    Returns:
    a textual description of this Filter
  - apply
```
public void apply(Object child)
           throws NoTestsRemainException
```
    Invoke with a Runner to cause all tests it intends to run to first be checked with the filter. Only those that pass the filter will be run.
    Parameters:
    child - the runner to be filtered by the receiver
    Throws:
    NoTestsRemainException - if the receiver removes all tests
  - intersect
```
public Filter intersect(Filter second)
```
    Returns a new Filter that accepts the intersection of the tests accepted by this Filter and second