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