diff options
Diffstat (limited to 'spec/rubyspec/library/stringio/open_spec.rb')
-rw-r--r-- | spec/rubyspec/library/stringio/open_spec.rb | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/spec/rubyspec/library/stringio/open_spec.rb b/spec/rubyspec/library/stringio/open_spec.rb new file mode 100644 index 0000000000..136ff5f972 --- /dev/null +++ b/spec/rubyspec/library/stringio/open_spec.rb @@ -0,0 +1,208 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require 'stringio' + +describe "StringIO.open when passed [Object, mode]" do + it "uses the passed Object as the StringIO backend" do + io = StringIO.open(str = "example", "r") + io.string.should equal(str) + end + + it "returns the blocks return value when yielding" do + ret = StringIO.open("example", "r") { :test } + ret.should equal(:test) + end + + it "yields self to the passed block" do + io = nil + StringIO.open("example", "r") { |strio| io = strio } + io.should be_kind_of(StringIO) + end + + it "closes self after yielding" do + io = nil + StringIO.open("example", "r") { |strio| io = strio } + io.closed?.should be_true + end + + it "even closes self when an exception is raised while yielding" do + io = nil + begin + StringIO.open("example", "r") do |strio| + io = strio + raise "Error" + end + rescue + end + io.closed?.should be_true + end + + it "sets self's string to nil after yielding" do + io = nil + StringIO.open("example", "r") { |strio| io = strio } + io.string.should be_nil + end + + it "even sets self's string to nil when an exception is raised while yielding" do + io = nil + begin + StringIO.open("example", "r") do |strio| + io = strio + raise "Error" + end + rescue + end + io.string.should be_nil + end + + it "sets the mode based on the passed mode" do + io = StringIO.open("example", "r") + io.closed_read?.should be_false + io.closed_write?.should be_true + + io = StringIO.open("example", "rb") + io.closed_read?.should be_false + io.closed_write?.should be_true + + io = StringIO.open("example", "r+") + io.closed_read?.should be_false + io.closed_write?.should be_false + + io = StringIO.open("example", "rb+") + io.closed_read?.should be_false + io.closed_write?.should be_false + + io = StringIO.open("example", "w") + io.closed_read?.should be_true + io.closed_write?.should be_false + + io = StringIO.open("example", "wb") + io.closed_read?.should be_true + io.closed_write?.should be_false + + io = StringIO.open("example", "w+") + io.closed_read?.should be_false + io.closed_write?.should be_false + + io = StringIO.open("example", "wb+") + io.closed_read?.should be_false + io.closed_write?.should be_false + + io = StringIO.open("example", "a") + io.closed_read?.should be_true + io.closed_write?.should be_false + + io = StringIO.open("example", "ab") + io.closed_read?.should be_true + io.closed_write?.should be_false + + io = StringIO.open("example", "a+") + io.closed_read?.should be_false + io.closed_write?.should be_false + + io = StringIO.open("example", "ab+") + io.closed_read?.should be_false + io.closed_write?.should be_false + end + + it "allows passing the mode as an Integer" do + io = StringIO.open("example", IO::RDONLY) + io.closed_read?.should be_false + io.closed_write?.should be_true + + io = StringIO.open("example", IO::RDWR) + io.closed_read?.should be_false + io.closed_write?.should be_false + + io = StringIO.open("example", IO::WRONLY) + io.closed_read?.should be_true + io.closed_write?.should be_false + + io = StringIO.open("example", IO::WRONLY | IO::TRUNC) + io.closed_read?.should be_true + io.closed_write?.should be_false + + io = StringIO.open("example", IO::RDWR | IO::TRUNC) + io.closed_read?.should be_false + io.closed_write?.should be_false + + io = StringIO.open("example", IO::WRONLY | IO::APPEND) + io.closed_read?.should be_true + io.closed_write?.should be_false + + io = StringIO.open("example", IO::RDWR | IO::APPEND) + io.closed_read?.should be_false + io.closed_write?.should be_false + end + + it "raises a RuntimeError when passed a frozen String in truncate mode as StringIO backend" do + lambda { StringIO.open("example".freeze, IO::TRUNC) }.should raise_error(RuntimeError) + end + + it "tries to convert the passed mode to a String using #to_str" do + obj = mock('to_str') + obj.should_receive(:to_str).and_return("r") + io = StringIO.open("example", obj) + + io.closed_read?.should be_false + io.closed_write?.should be_true + end + + it "raises an Errno::EACCES error when passed a frozen string with a write-mode" do + (str = "example").freeze + lambda { StringIO.open(str, "r+") }.should raise_error(Errno::EACCES) + lambda { StringIO.open(str, "w") }.should raise_error(Errno::EACCES) + lambda { StringIO.open(str, "a") }.should raise_error(Errno::EACCES) + end +end + +describe "StringIO.open when passed [Object]" do + it "uses the passed Object as the StringIO backend" do + io = StringIO.open(str = "example") + io.string.should equal(str) + end + + it "yields self to the passed block" do + io = nil + ret = StringIO.open("example") { |strio| io = strio } + io.should equal(ret) + end + + it "sets the mode to read-write" do + io = StringIO.open("example") + io.closed_read?.should be_false + io.closed_write?.should be_false + end + + it "tries to convert the passed Object to a String using #to_str" do + obj = mock('to_str') + obj.should_receive(:to_str).and_return("example") + io = StringIO.open(obj) + io.string.should == "example" + end + + it "automatically sets the mode to read-only when passed a frozen string" do + (str = "example").freeze + io = StringIO.open(str) + io.closed_read?.should be_false + io.closed_write?.should be_true + end +end + +describe "StringIO.open when passed no arguments" do + it "yields self to the passed block" do + io = nil + ret = StringIO.open { |strio| io = strio } + io.should equal(ret) + end + + it "sets the mode to read-write" do + io = StringIO.open + io.closed_read?.should be_false + io.closed_write?.should be_false + end + + it "uses an empty String as the StringIO backend" do + StringIO.open.string.should == "" + end +end + |