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 lambda { @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") lambda { io.readline }.should raise_error(IOError) io = StringIO.new("xyz") io.close_read lambda { io.readline }.should raise_error(IOError) end end ruby_version_is "2.4" do 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 end