diff options
Diffstat (limited to 'spec/ruby/core/io/pread_spec.rb')
-rw-r--r-- | spec/ruby/core/io/pread_spec.rb | 81 |
1 files changed, 79 insertions, 2 deletions
diff --git a/spec/ruby/core/io/pread_spec.rb b/spec/ruby/core/io/pread_spec.rb index 43071d6a31..28afc80e5c 100644 --- a/spec/ruby/core/io/pread_spec.rb +++ b/spec/ruby/core/io/pread_spec.rb @@ -1,7 +1,7 @@ # -*- encoding: utf-8 -*- require_relative '../../spec_helper' -platform_is_not :windows do +guard -> { platform_is_not :windows or ruby_version_is "3.3" } do describe "IO#pread" do before :each do @fname = tmp("io_pread.txt") @@ -21,16 +21,93 @@ platform_is_not :windows do end it "accepts a length, an offset, and an output buffer" do - buffer = "foo" + buffer = +"foo" @file.pread(3, 4, buffer) buffer.should == "567" end + it "shrinks the buffer in case of less bytes read" do + buffer = +"foo" + @file.pread(1, 0, buffer) + buffer.should == "1" + end + + it "grows the buffer in case of more bytes read" do + buffer = +"foo" + @file.pread(5, 0, buffer) + buffer.should == "12345" + end + it "does not advance the file pointer" do @file.pread(4, 0).should == "1234" @file.read.should == "1234567890" end + it "ignores the current offset" do + @file.pos = 3 + @file.pread(4, 0).should == "1234" + end + + it "returns an empty string for maxlen = 0" do + @file.pread(0, 4).should == "" + end + + it "ignores the offset for maxlen = 0, even if it is out of file bounds" do + @file.pread(0, 400).should == "" + end + + it "does not reset the buffer when reading with maxlen = 0" do + buffer = +"foo" + @file.pread(0, 4, buffer) + buffer.should == "foo" + + @file.pread(0, 400, buffer) + buffer.should == "foo" + end + + it "converts maxlen to Integer using #to_int" do + maxlen = mock('maxlen') + maxlen.should_receive(:to_int).and_return(4) + @file.pread(maxlen, 0).should == "1234" + end + + it "converts offset to Integer using #to_int" do + offset = mock('offset') + offset.should_receive(:to_int).and_return(0) + @file.pread(4, offset).should == "1234" + end + + it "converts a buffer to String using to_str" do + buffer = mock('buffer') + buffer.should_receive(:to_str).at_least(1).and_return(+"foo") + @file.pread(4, 0, buffer) + buffer.should_not.is_a?(String) + buffer.to_str.should == "1234" + end + + it "raises TypeError if maxlen is not an Integer and cannot be coerced into Integer" do + maxlen = Object.new + -> { @file.pread(maxlen, 0) }.should raise_error(TypeError, 'no implicit conversion of Object into Integer') + end + + it "raises TypeError if offset is not an Integer and cannot be coerced into Integer" do + offset = Object.new + -> { @file.pread(4, offset) }.should raise_error(TypeError, 'no implicit conversion of Object into Integer') + end + + it "raises ArgumentError for negative values of maxlen" do + -> { @file.pread(-4, 0) }.should raise_error(ArgumentError, 'negative string size (or size too big)') + end + + it "raised Errno::EINVAL for negative values of offset" do + -> { @file.pread(4, -1) }.should raise_error(Errno::EINVAL, /Invalid argument/) + end + + it "raises TypeError if the buffer is not a String and cannot be coerced into String" do + buffer = Object.new + -> { @file.pread(4, 0, buffer) }.should raise_error(TypeError, 'no implicit conversion of Object into String') + end + it "raises EOFError if end-of-file is reached" do -> { @file.pread(1, 10) }.should raise_error(EOFError) end |