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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "StringIO#print" do
before :each do
@io = StringIO.new('example')
end
it "prints $_ when passed no arguments" do
$_ = nil
@io.print
@io.string.should == "example"
$_ = "blah"
@io.print
@io.string.should == "blahple"
end
it "prints the passed arguments to self" do
@io.print(5, 6, 7, 8)
@io.string.should == "5678ple"
end
it "tries to convert the passed Object to a String using #to_s" do
obj = mock("to_s")
obj.should_receive(:to_s).and_return("to_s")
@io.print(obj)
@io.string.should == "to_sple"
end
it "returns nil" do
@io.print(1, 2, 3).should be_nil
end
it "pads self with \\000 when the current position is after the end" do
@io.pos = 10
@io.print(1, 2, 3)
@io.string.should == "example\000\000\000123"
end
it "honors the output record separator global" do
old_rs = $\
suppress_warning {$\ = 'x'}
begin
@io.print(5, 6, 7, 8)
@io.string.should == '5678xle'
ensure
suppress_warning {$\ = old_rs}
end
end
it "updates the current position" do
@io.print(1, 2, 3)
@io.pos.should eql(3)
@io.print(1, 2, 3)
@io.pos.should eql(6)
end
it "correctly updates the current position when honoring the output record separator global" do
old_rs = $\
suppress_warning {$\ = 'x'}
begin
@io.print(5, 6, 7, 8)
@io.pos.should eql(5)
ensure
suppress_warning {$\ = old_rs}
end
end
end
describe "StringIO#print when in append mode" do
before :each do
@io = StringIO.new("example", "a")
end
it "appends the passed argument to the end of self" do
@io.print(", just testing")
@io.string.should == "example, just testing"
@io.print(" and more testing")
@io.string.should == "example, just testing and more testing"
end
it "correctly updates self's position" do
@io.print(", testing")
@io.pos.should eql(16)
end
end
describe "StringIO#print when self is not writable" do
it "raises an IOError" do
io = StringIO.new("test", "r")
-> { io.print("test") }.should raise_error(IOError)
io = StringIO.new("test")
io.close_write
-> { io.print("test") }.should raise_error(IOError)
end
end
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