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require 'spec_helper'
require 'mspec/expectations/expectations'
require 'mspec/matchers'
module BeAnInOfSpecs
class A
end
class B < A
end
class C < B
end
end
describe BeAnInstanceOfMatcher do
it "matches when actual is an instance_of? expected" do
a = BeAnInOfSpecs::A.new
BeAnInstanceOfMatcher.new(BeAnInOfSpecs::A).matches?(a).should be_true
b = BeAnInOfSpecs::B.new
BeAnInstanceOfMatcher.new(BeAnInOfSpecs::B).matches?(b).should be_true
end
it "does not match when actual is not an instance_of? expected" do
a = BeAnInOfSpecs::A.new
BeAnInstanceOfMatcher.new(BeAnInOfSpecs::B).matches?(a).should be_false
b = BeAnInOfSpecs::B.new
BeAnInstanceOfMatcher.new(BeAnInOfSpecs::A).matches?(b).should be_false
c = BeAnInOfSpecs::C.new
BeAnInstanceOfMatcher.new(BeAnInOfSpecs::A).matches?(c).should be_false
BeAnInstanceOfMatcher.new(BeAnInOfSpecs::B).matches?(c).should be_false
end
it "provides a useful failure message" do
matcher = BeAnInstanceOfMatcher.new(Numeric)
matcher.matches?("string")
matcher.failure_message.should == [
"Expected \"string\" (String)", "to be an instance of Numeric"]
end
it "provides a useful negative failure message" do
matcher = BeAnInstanceOfMatcher.new(Numeric)
matcher.matches?(4.0)
matcher.negative_failure_message.should == [
"Expected 4.0 (Float)", "not to be an instance of Numeric"]
end
end
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