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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Numeric#coerce" do
before :each do
@obj = NumericSpecs::Subclass.new
@obj.should_receive(:to_f).any_number_of_times.and_return(10.5)
end
it "returns [other, self] if self and other are instances of the same class" do
a = NumericSpecs::Subclass.new
b = NumericSpecs::Subclass.new
a.coerce(b).should == [b, a]
end
# I (emp) think that this behavior is actually a bug in MRI. It's here as documentation
# of the behavior until we find out if it's a bug.
quarantine! do
it "considers the presense of a metaclass when checking the class of the objects" do
a = NumericSpecs::Subclass.new
b = NumericSpecs::Subclass.new
# inject a metaclass on a
class << a; true; end
# watch it explode
lambda { a.coerce(b) }.should raise_error(TypeError)
end
end
it "calls #to_f to convert other if self responds to #to_f" do
# Do not use NumericSpecs::Subclass here, because coerce checks the classes of the receiver
# and arguments before calling #to_f.
other = mock("numeric")
lambda { @obj.coerce(other) }.should raise_error(TypeError)
end
it "returns [other.to_f, self.to_f] if self and other are instances of different classes" do
result = @obj.coerce(2.5)
result.should == [2.5, 10.5]
result.first.should be_kind_of(Float)
result.last.should be_kind_of(Float)
result = @obj.coerce(3)
result.should == [3.0, 10.5]
result.first.should be_kind_of(Float)
result.last.should be_kind_of(Float)
result = @obj.coerce("4.4")
result.should == [4.4, 10.5]
result.first.should be_kind_of(Float)
result.last.should be_kind_of(Float)
result = @obj.coerce(bignum_value)
result.should == [bignum_value.to_f, 10.5]
result.first.should be_kind_of(Float)
result.last.should be_kind_of(Float)
end
it "raises a TypeError when passed nil" do
lambda { @obj.coerce(nil) }.should raise_error(TypeError)
end
it "raises a TypeError when passed a boolean" do
lambda { @obj.coerce(false) }.should raise_error(TypeError)
end
it "raises a TypeError when passed a Symbol" do
lambda { @obj.coerce(:symbol) }.should raise_error(TypeError)
end
it "raises an ArgumentError when passed a String" do
lambda { @obj.coerce("test") }.should raise_error(ArgumentError)
end
end
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