org.hamcrest.core
Class Is<T>

java.lang.Object
  org.hamcrest.BaseMatcher<T>
      org.hamcrest.core.Is<T>

All Implemented Interfaces:

Matcher<T>, SelfDescribing

public class Is<T>
extends BaseMatcher<T>

Decorates another Matcher, retaining the behavior but allowing tests to be slightly more expressive. eg. assertThat(cheese, equalTo(smelly)) vs assertThat(cheese, is(equalTo(smelly)))

Constructor Summary

Is(Matcher<T> matcher)

Method Summary

void	describeTo(Description description) Generates a description of the object.
static Matcher<Object>	is(Class<?> type) This is a shortcut to the frequently used is(instanceOf(SomeClass.class)).
static <T> Matcher<T>	is(Matcher<T> matcher) Decorates another Matcher, retaining the behavior but allowing tests to be slightly more expressive.
static <T> Matcher<T>	is(T value) This is a shortcut to the frequently used is(equalTo(x)).
boolean	matches(Object arg) Evaluates the matcher for argument item.

Methods inherited from class org.hamcrest.BaseMatcher

_dont_implement_Matcher___instead_extend_BaseMatcher_, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Is

public Is(Matcher<T> matcher)

Method Detail

matches

public boolean matches(Object arg)

Description copied from interface: Matcher

Evaluates the matcher for argument item.

This method matches against Object, instead of the generic type T. This is because the caller of the Matcher does not know at runtime what the type is (because of type erasure with Java generics). It is down to the implementations to check the correct type.

Parameters:

arg - the object against which the matcher is evaluated.

Returns:

true if item matches, otherwise false.

See Also:

BaseMatcher

describeTo

public void describeTo(Description description)

Description copied from interface: SelfDescribing

Generates a description of the object. The description may be part of a a description of a larger object of which this is just a component, so it should be worded appropriately.

Parameters:

description - The description to be built or appended to.

is

public static <T> Matcher<T> is(Matcher<T> matcher)

Decorates another Matcher, retaining the behavior but allowing tests to be slightly more expressive. eg. assertThat(cheese, equalTo(smelly)) vs assertThat(cheese, is(equalTo(smelly)))

is

public static <T> Matcher<T> is(T value)

This is a shortcut to the frequently used is(equalTo(x)). eg. assertThat(cheese, is(equalTo(smelly))) vs assertThat(cheese, is(smelly))

is

public static Matcher<Object> is(Class<?> type)

This is a shortcut to the frequently used is(instanceOf(SomeClass.class)). eg. assertThat(cheese, is(instanceOf(Cheddar.class))) vs assertThat(cheese, is(Cheddar.class))