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More about adding a collaboratorBuilt in matchers
Object identity
actual.should equal(expected) # passes if actual.equal?(expected)
Object equivalence
actual.should == expected # passes if actual == expected
actual.should eql(expected) # passes if actual.eql?(expected)
Optional APIs for identity/equivalence
actual.should eq(expected) # passes if actual == expected
actual.should be(expected) # passes if actual.equal?(expected)
Comparisons
actual.should be > expected
actual.should be >= expected
actual.should be <= expected
actual.should be < expected
actual.should =~ /expression/
actual.should match(/expression/)
actual.should be_within(delta).of(expected)
Types/classes
actual.should be_instance_of(expected)
actual.should be_kind_of(expected)
Truthiness and existentialism
actual.should be_true # passes if actual is truthy (not nil or false)
actual.should be_false # passes if actual is falsy (nil or false)
actual.should be_nil # passes if actual is nil
actual.should be # passes if actual is truthy (not nil or false)
Expecting errors
expect { ... }.to raise_error
expect { ... }.to raise_error(ErrorClass)
expect { ... }.to raise_error("message")
expect { ... }.to raise_error(ErrorClass, "message")
Expecting throws
expect { ... }.to throw_symbol
expect { ... }.to throw_symbol(:symbol)
expect { ... }.to throw_symbol(:symbol, 'value')
Predicate matchers
actual.should be_xxx # passes if actual.xxx?
actual.should have_xxx(:arg) # passes if actual.has_xxx?(:arg)
Examples
[].should be_empty # passes because [].empty? returns true
{ :a => 1 }.should have_key(:a) # passes because the hash has the key :a
Collection membership
actual.should include(expected)
Examples
[1,2,3].should include(1)
[1,2,3].should include(1, 2)
{:a => 'b'}.should include(:a => 'b')
"this string".should include("is str")
Ranges (1.9 only)
(1..10).should cover(3)
Topics
- "be" matchers
- be_within matcher
- equality matchers
- exist matcher
- expect change
- raise_error matcher
- have(n).items matcher
- include matcher
- match matcher
- operator matchers
- predicate matchers
- respond_to matcher
- satisfy matcher
- throw_symbol matcher
- specify types of objects
- cover matcher
Last published over 7 years ago by .