Hamcrest comes with a library of useful matchers. Here are some of the most
important ones.
Core
* anything - always matches, useful if you don't care what the object under test
is
* describedAs - decorator to adding custom failure description
* is - decorator to improve readability - see "Sugar", below
Logical
* allOf - matches if all matchers match, short circuits (like Java &&)
* anyOf - matches if any matchers match, short circuits (like Java ||)
* not - matches if the wrapped matcher doesn't match and vice versa
Object
* equalTo - test object equality using Object.equals
* hasToString - test Object.toString
* instanceOf, isCompatibleType - test type
* notNullValue, nullValue - test for null
* sameInstance - test object identity
Beans
* hasProperty - test JavaBeans properties
Collections
* array - test an array's elements against an array of matchers
* hasEntry, hasKey, hasValue - test a map contains an entry, key or value
* hasItem, hasItems - test a collection contains elements
* hasItemInArray - test an array contains an element
Number
* closeTo - test floating point values are close to a given value
* greaterThan, greaterThanOrEqualTo, lessThan, lessThanOrEqualTo - test ordering
Text
* equalToIgnoringCase - test string equality ignoring case
* equalToIgnoringWhiteSpace - test string equality ignoring differences in runs
of whitespace
* containsString, endsWith, startsWith - test string matching
