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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "StringIO#readline when passed [separator]" do
before :each do
@io = StringIO.new("this>is>an>example")
end
it "returns the data read till the next occurrence of the passed separator" do
@io.readline(">").should == "this>"
@io.readline(">").should == "is>"
@io.readline(">").should == "an>"
@io.readline(">").should == "example"
end
it "sets $_ to the read content" do
@io.readline(">")
$_.should == "this>"
@io.readline(">")
$_.should == "is>"
@io.readline(">")
$_.should == "an>"
@io.readline(">")
$_.should == "example"
end
it "updates self's lineno by one" do
@io.readline(">")
@io.lineno.should eql(1)
@io.readline(">")
@io.lineno.should eql(2)
@io.readline(">")
@io.lineno.should eql(3)
end
it "returns the next paragraph when the passed separator is an empty String" do
io = StringIO.new("this is\n\nan example")
io.readline("").should == "this is\n\n"
io.readline("").should == "an example"
end
it "returns the remaining content starting at the current position when passed nil" do
io = StringIO.new("this is\n\nan example")
io.pos = 5
io.readline(nil).should == "is\n\nan example"
end
it "tries to convert the passed separator to a String using #to_str" do
obj = mock('to_str')
obj.should_receive(:to_str).and_return(">")
@io.readline(obj).should == "this>"
end
end
describe "StringIO#readline when passed no argument" do
before :each do
@io = StringIO.new("this is\nan example\nfor StringIO#readline")
end
it "returns the data read till the next occurrence of $/ or till eof" do
@io.readline.should == "this is\n"
begin
old_sep, $/ = $/, " "
@io.readline.should == "an "
@io.readline.should == "example\nfor "
@io.readline.should == "StringIO#readline"
ensure
$/ = old_sep
end
end
it "sets $_ to the read content" do
@io.readline
$_.should == "this is\n"
@io.readline
$_.should == "an example\n"
@io.readline
$_.should == "for StringIO#readline"
end
it "updates self's position" do
@io.readline
@io.pos.should eql(8)
@io.readline
@io.pos.should eql(19)
@io.readline
@io.pos.should eql(40)
end
it "updates self's lineno" do
@io.readline
@io.lineno.should eql(1)
@io.readline
@io.lineno.should eql(2)
@io.readline
@io.lineno.should eql(3)
end
it "raises an IOError if self is at the end" do
@io.pos = 40
-> { @io.readline }.should raise_error(IOError)
end
end
describe "StringIO#readline when in write-only mode" do
it "raises an IOError" do
io = StringIO.new("xyz", "w")
-> { io.readline }.should raise_error(IOError)
io = StringIO.new("xyz")
io.close_read
-> { io.readline }.should raise_error(IOError)
end
end
describe "StringIO#readline when passed [chomp]" do
it "returns the data read without a trailing newline character" do
io = StringIO.new("this>is>an>example\n")
io.readline(chomp: true).should == "this>is>an>example"
end
end
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