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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "StringIO#putc when passed [String]" do
before :each do
@io = StringIO.new('example')
end
it "overwrites the character at the current position" do
@io.putc("t")
@io.string.should == "txample"
@io.pos = 3
@io.putc("t")
@io.string.should == "txatple"
end
it "only writes the first character from the passed String" do
@io.putc("test")
@io.string.should == "txample"
end
it "returns the passed String" do
str = "test"
@io.putc(str).should equal(str)
end
it "correctly updates the current position" do
@io.putc("t")
@io.pos.should == 1
@io.putc("test")
@io.pos.should == 2
@io.putc("t")
@io.pos.should == 3
end
end
describe "StringIO#putc when passed [Object]" do
before :each do
@io = StringIO.new('example')
end
it "it writes the passed Integer % 256 to self" do
@io.putc(333) # 333 % 256 == ?M
@io.string.should == "Mxample"
@io.putc(-450) # -450 % 256 == ?>
@io.string.should == "M>ample"
end
it "pads self with \\000 when the current position is after the end" do
@io.pos = 10
@io.putc(?A)
@io.string.should == "example\000\000\000A"
end
it "tries to convert the passed argument to an Integer using #to_int" do
obj = mock('to_int')
obj.should_receive(:to_int).and_return(116)
@io.putc(obj)
@io.string.should == "txample"
end
it "raises a TypeError when the passed argument can't be coerced to Integer" do
-> { @io.putc(Object.new) }.should raise_error(TypeError)
end
end
describe "StringIO#putc when in append mode" do
it "appends to the end of self" do
io = StringIO.new("test", "a")
io.putc(?t)
io.string.should == "testt"
end
end
describe "StringIO#putc when self is not writable" do
it "raises an IOError" do
io = StringIO.new("test", "r")
-> { io.putc(?a) }.should raise_error(IOError)
io = StringIO.new("test")
io.close_write
-> { io.putc("t") }.should raise_error(IOError)
end
end
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