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require_relative '../../spec_helper'
require 'bigdecimal'
describe "Integer#coerce" do
context "fixnum" do
describe "when given a Fixnum" do
it "returns an array containing two Fixnums" do
1.coerce(2).should == [2, 1]
1.coerce(2).map { |i| i.class }.should == [Fixnum, Fixnum]
end
end
describe "when given a String" do
it "raises an ArgumentError when trying to coerce with a non-number String" do
-> { 1.coerce(":)") }.should raise_error(ArgumentError)
end
it "returns an array containing two Floats" do
1.coerce("2").should == [2.0, 1.0]
1.coerce("-2").should == [-2.0, 1.0]
end
end
it "raises a TypeError when trying to coerce with nil" do
-> { 1.coerce(nil) }.should raise_error(TypeError)
end
it "tries to convert the given Object into a Float by using #to_f" do
(obj = mock('1.0')).should_receive(:to_f).and_return(1.0)
2.coerce(obj).should == [1.0, 2.0]
(obj = mock('0')).should_receive(:to_f).and_return('0')
-> { 2.coerce(obj).should == [1.0, 2.0] }.should raise_error(TypeError)
end
it "raises a TypeError when given an Object that does not respond to #to_f" do
-> { 1.coerce(mock('x')) }.should raise_error(TypeError)
-> { 1.coerce(1..4) }.should raise_error(TypeError)
-> { 1.coerce(:test) }.should raise_error(TypeError)
end
end
context "bignum" do
it "coerces other to a Bignum and returns [other, self] when passed a Fixnum" do
a = bignum_value
ary = a.coerce(2)
ary[0].should be_kind_of(Bignum)
ary[1].should be_kind_of(Bignum)
ary.should == [2, a]
end
it "returns [other, self] when passed a Bignum" do
a = bignum_value
b = bignum_value
ary = a.coerce(b)
ary[0].should be_kind_of(Bignum)
ary[1].should be_kind_of(Bignum)
ary.should == [b, a]
end
it "raises a TypeError when not passed a Fixnum or Bignum" do
a = bignum_value
-> { a.coerce(nil) }.should raise_error(TypeError)
-> { a.coerce(mock('str')) }.should raise_error(TypeError)
-> { a.coerce(1..4) }.should raise_error(TypeError)
-> { a.coerce(:test) }.should raise_error(TypeError)
end
it "coerces both values to Floats and returns [other, self] when passed a Float" do
a = bignum_value
a.coerce(1.2).should == [1.2, a.to_f]
end
it "coerces both values to Floats and returns [other, self] when passed a String" do
a = bignum_value
a.coerce("123").should == [123.0, a.to_f]
end
it "calls #to_f to coerce other to a Float" do
b = mock("bignum value")
b.should_receive(:to_f).and_return(1.2)
a = bignum_value
ary = a.coerce(b)
ary.should == [1.2, a.to_f]
end
end
context "bigdecimal" do
it "produces Floats" do
x, y = 3.coerce(BigDecimal("3.4"))
x.class.should == Float
x.should == 3.4
y.class.should == Float
y.should == 3.0
end
end
end
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