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Diffstat (limited to 'spec/ruby/core/io/pread_spec.rb')
-rw-r--r-- | spec/ruby/core/io/pread_spec.rb | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/spec/ruby/core/io/pread_spec.rb b/spec/ruby/core/io/pread_spec.rb new file mode 100644 index 0000000000..b5b516fa53 --- /dev/null +++ b/spec/ruby/core/io/pread_spec.rb @@ -0,0 +1,52 @@ +# -*- encoding: utf-8 -*- +require_relative '../../spec_helper' + +ruby_version_is "2.5" do + platform_is_not :windows do + describe "IO#pread" do + before :each do + @fname = tmp("io_pread.txt") + @contents = "1234567890" + touch(@fname) { |f| f.write @contents } + @file = File.open(@fname, "r+") + end + + after :each do + @file.close + rm_r @fname + end + + it "accepts a length, and an offset" do + @file.pread(4, 0).should == "1234" + @file.pread(3, 4).should == "567" + end + + it "accepts a length, an offset, and an output buffer" do + buffer = "foo" + @file.pread(3, 4, buffer) + buffer.should == "567" + end + + it "does not advance the file pointer" do + @file.pread(4, 0).should == "1234" + @file.read.should == "1234567890" + end + + it "raises EOFError if end-of-file is reached" do + lambda { @file.pread(1, 10) }.should raise_error(EOFError) + end + + it "raises IOError when file is not open in read mode" do + File.open(@fname, "w") do |file| + lambda { file.pread(1, 1) }.should raise_error(IOError) + end + end + + it "raises IOError when file is closed" do + file = File.open(@fname, "r+") + file.close + lambda { file.pread(1, 1) }.should raise_error(IOError) + end + end + end +end |