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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe :kernel_float, :shared => true do
it "returns the identical Float for numeric Floats" do
float = 1.12
float2 = @object.send(:Float, float)
float2.should == float
float2.object_id.should == float.object_id
end
it "returns a Float for Fixnums" do
@object.send(:Float, 1).should == 1.0
end
it "returns a Float for Bignums" do
@object.send(:Float, 1000000000000).should == 1000000000000.0
end
it "raises an ArgumentError for nil" do
lambda { @object.send(:Float, nil) }.should raise_error(TypeError)
end
it "returns the identical NaN for NaN" do
nan = nan_value
nan.nan?.should be_true
nan2 = @object.send(:Float, nan)
nan2.nan?.should be_true
nan2.should equal(nan)
end
it "returns the same Infinity for Infinity" do
infinity = infinity_value
infinity2 = @object.send(:Float, infinity)
infinity2.should == infinity_value
infinity.should equal(infinity2)
end
it "converts Strings to floats without calling #to_f" do
string = "10"
string.should_not_receive(:to_f)
@object.send(:Float, string).should == 10.0
end
it "converts Strings with decimal points into Floats" do
@object.send(:Float, "10.0").should == 10.0
end
it "raises an ArgumentError for a String of word characters" do
lambda { @object.send(:Float, "float") }.should raise_error(ArgumentError)
end
it "raises an ArgumentError if there are two decimal points in the String" do
lambda { @object.send(:Float, "10.0.0") }.should raise_error(ArgumentError)
end
it "raises an ArgumentError for a String of numbers followed by word characters" do
lambda { @object.send(:Float, "10D") }.should raise_error(ArgumentError)
end
it "raises an ArgumentError for a String of word characters followed by numbers" do
lambda { @object.send(:Float, "D10") }.should raise_error(ArgumentError)
end
it "is strict about the string form even across newlines" do
lambda { @object.send(:Float, "not a number\n10") }.should raise_error(ArgumentError)
lambda { @object.send(:Float, "10\nnot a number") }.should raise_error(ArgumentError)
end
it "converts String subclasses to floats without calling #to_f" do
my_string = Class.new(String) do
def to_f() 1.2 end
end
@object.send(:Float, my_string.new("10")).should == 10.0
end
it "returns a positive Float if the string is prefixed with +" do
@object.send(:Float, "+10").should == 10.0
@object.send(:Float, " +10").should == 10.0
end
it "returns a negative Float if the string is prefixed with +" do
@object.send(:Float, "-10").should == -10.0
@object.send(:Float, " -10").should == -10.0
end
it "raises an ArgumentError if a + or - is embedded in a String" do
lambda { @object.send(:Float, "1+1") }.should raise_error(ArgumentError)
lambda { @object.send(:Float, "1-1") }.should raise_error(ArgumentError)
end
it "raises an ArgumentError if a String has a trailing + or -" do
lambda { @object.send(:Float, "11+") }.should raise_error(ArgumentError)
lambda { @object.send(:Float, "11-") }.should raise_error(ArgumentError)
end
it "raises an ArgumentError for a String with a leading _" do
lambda { @object.send(:Float, "_1") }.should raise_error(ArgumentError)
end
it "returns a value for a String with an embedded _" do
@object.send(:Float, "1_000").should == 1000.0
end
it "raises an ArgumentError for a String with a trailing _" do
lambda { @object.send(:Float, "10_") }.should raise_error(ArgumentError)
end
it "raises an ArgumentError for a String of \\0" do
lambda { @object.send(:Float, "\0") }.should raise_error(ArgumentError)
end
it "raises an ArgumentError for a String with a leading \\0" do
lambda { @object.send(:Float, "\01") }.should raise_error(ArgumentError)
end
it "raises an ArgumentError for a String with an embedded \\0" do
lambda { @object.send(:Float, "1\01") }.should raise_error(ArgumentError)
end
it "raises an ArgumentError for a String with a trailing \\0" do
lambda { @object.send(:Float, "1\0") }.should raise_error(ArgumentError)
end
it "raises an ArgumentError for a String that is just an empty space" do
lambda { @object.send(:Float, " ") }.should raise_error(ArgumentError)
end
it "raises an ArgumentError for a String that with an embedded space" do
lambda { @object.send(:Float, "1 2") }.should raise_error(ArgumentError)
end
it "returns a value for a String with a leading space" do
@object.send(:Float, " 1").should == 1.0
end
it "returns a value for a String with a trailing space" do
@object.send(:Float, "1 ").should == 1.0
end
%w(e E).each do |e|
it "raises an ArgumentError if #{e} is the trailing character" do
lambda { @object.send(:Float, "2#{e}") }.should raise_error(ArgumentError)
end
it "raises an ArgumentError if #{e} is the leading character" do
lambda { @object.send(:Float, "#{e}2") }.should raise_error(ArgumentError)
end
it "returns Infinity for '2#{e}1000'" do
@object.send(:Float, "2#{e}1000").should == (1.0/0)
end
it "returns 0 for '2#{e}-1000'" do
@object.send(:Float, "2#{e}-1000").should == 0
end
it "allows embedded _ in a number on either side of the #{e}" do
@object.send(:Float, "2_0#{e}100").should == 20e100
@object.send(:Float, "20#{e}1_00").should == 20e100
@object.send(:Float, "2_0#{e}1_00").should == 20e100
end
it "raises an exception if a space is embedded on either side of the '#{e}'" do
lambda { @object.send(:Float, "2 0#{e}100") }.should raise_error(ArgumentError)
lambda { @object.send(:Float, "20#{e}1 00") }.should raise_error(ArgumentError)
end
it "raises an exception if there's a leading _ on either side of the '#{e}'" do
lambda { @object.send(:Float, "_20#{e}100") }.should raise_error(ArgumentError)
lambda { @object.send(:Float, "20#{e}_100") }.should raise_error(ArgumentError)
end
it "raises an exception if there's a trailing _ on either side of the '#{e}'" do
lambda { @object.send(:Float, "20_#{e}100") }.should raise_error(ArgumentError)
lambda { @object.send(:Float, "20#{e}100_") }.should raise_error(ArgumentError)
end
it "allows decimal points on the left side of the '#{e}'" do
@object.send(:Float, "2.0#{e}2").should == 2e2
end
it "raises an ArgumentError if there's a decimal point on the right side of the '#{e}'" do
lambda { @object.send(:Float, "20#{e}2.0") }.should raise_error(ArgumentError)
end
end
it "returns a Float that can be a parameter to #Float again" do
float = @object.send(:Float, "10")
@object.send(:Float, float).should == 10.0
end
it "otherwise, converts the given argument to a Float by calling #to_f" do
(obj = mock('1.2')).should_receive(:to_f).once.and_return(1.2)
obj.should_not_receive(:to_i)
@object.send(:Float, obj).should == 1.2
end
ruby_version_is '' ... '1.8.7' do
it "raises an Argument Error if to_f is called and it returns NaN" do
(nan = mock('NaN')).should_receive(:to_f).once.and_return(nan_value)
lambda { @object.send(:Float, nan) }.should raise_error(ArgumentError)
end
end
ruby_version_is '1.8.7' do
it "returns the identical NaN if to_f is called and it returns NaN" do
nan = nan_value
(nan_to_f = mock('NaN')).should_receive(:to_f).once.and_return(nan)
nan2 = @object.send(:Float, nan_to_f)
nan2.nan?.should be_true
nan2.should equal(nan)
end
end
it "returns the identical Infinity if to_f is called and it returns Infinity" do
infinity = infinity_value
(infinity_to_f = mock('Infinity')).should_receive(:to_f).once.and_return(infinity)
infinity2 = @object.send(:Float, infinity_to_f)
infinity2.should equal(infinity)
end
it "raises a TypeError if #to_f is not provided" do
lambda { @object.send(:Float, mock('x')) }.should raise_error(TypeError)
end
it "raises a TypeError if #to_f returns a String" do
(obj = mock('ha!')).should_receive(:to_f).once.and_return('ha!')
lambda { @object.send(:Float, obj) }.should raise_error(TypeError)
end
it "raises a TypeError if #to_f returns an Integer" do
(obj = mock('123')).should_receive(:to_f).once.and_return(123)
lambda { @object.send(:Float, obj) }.should raise_error(TypeError)
end
end
describe "Kernel.Float" do
it_behaves_like :kernel_float, :Float, Kernel
end
describe "Kernel#Float" do
it_behaves_like :kernel_float, :Float, Object.new
end
describe "Kernel#Float" do
it "is a private method" do
Kernel.should have_private_instance_method(:Float)
end
end
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