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* Other ruby implementations use the spec/ruby directory. [Misc #13792] [ruby-core:82287] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
70 lines
1.9 KiB
Ruby
70 lines
1.9 KiB
Ruby
require File.expand_path('../../../spec_helper', __FILE__)
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require "stringio"
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describe "StringIO#truncate when passed [length]" do
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before :each do
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@io = StringIO.new('123456789')
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end
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# TODO: Report to Ruby-Core: The RDoc says it always returns 0
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it "returns the passed length" do
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@io.truncate(4).should eql(4)
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@io.truncate(10).should eql(10)
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end
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it "truncated the underlying string down to the passed length" do
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@io.truncate(4)
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@io.string.should == "1234"
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end
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it "does not create a copy of the underlying string" do
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io = StringIO.new(str = "123456789")
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io.truncate(4)
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io.string.should equal(str)
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end
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it "does not change the position" do
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@io.pos = 7
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@io.truncate(4)
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@io.pos.should eql(7)
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end
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it "can grow a string to a larger size, padding it with \\000" do
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@io.truncate(12)
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@io.string.should == "123456789\000\000\000"
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end
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it "raises an Errno::EINVAL when the passed length is negative" do
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lambda { @io.truncate(-1) }.should raise_error(Errno::EINVAL)
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lambda { @io.truncate(-10) }.should raise_error(Errno::EINVAL)
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end
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it "tries to convert the passed length to an Integer using #to_int" do
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obj = mock("to_int")
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obj.should_receive(:to_int).and_return(4)
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@io.truncate(obj)
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@io.string.should == "1234"
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end
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it "returns the passed length Object, NOT the result of #to_int" do
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obj = mock("to_int")
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obj.should_receive(:to_int).and_return(4)
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@io.truncate(obj).should equal(obj)
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end
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it "raises a TypeError when the passed length can't be converted to an Integer" do
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lambda { @io.truncate(Object.new) }.should raise_error(TypeError)
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end
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end
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describe "StringIO#truncate when self is not writable" do
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it "raises an IOError" do
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io = StringIO.new("test", "r")
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lambda { io.truncate(2) }.should raise_error(IOError)
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io = StringIO.new("test")
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io.close_write
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lambda { io.truncate(2) }.should raise_error(IOError)
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end
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end
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