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Diffstat (limited to 'spec/ruby/core/string/setbyte_spec.rb')
-rw-r--r-- | spec/ruby/core/string/setbyte_spec.rb | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/spec/ruby/core/string/setbyte_spec.rb b/spec/ruby/core/string/setbyte_spec.rb new file mode 100644 index 0000000000..6373d74be1 --- /dev/null +++ b/spec/ruby/core/string/setbyte_spec.rb @@ -0,0 +1,105 @@ +# -*- encoding: utf-8 -*- +require File.expand_path('../../../spec_helper', __FILE__) + +describe "String#setbyte" do + it "returns an Integer" do + "a".setbyte(0,1).should be_kind_of(Integer) + end + + it "modifies the receiver" do + str = "glark" + old_id = str.object_id + str.setbyte(0,88) + str.object_id.should == old_id + end + + it "changes the byte at the given index to the new byte" do + str = "a" + str.setbyte(0,98) + str.should == 'b' + + # copy-on-write case + str1, str2 = "fooXbar".split("X") + str2.setbyte(0, 50) + str2.should == "2ar" + str1.should == "foo" + end + + it "allows changing bytes in multi-byte characters" do + str = "\u{915}" + str.setbyte(1,254) + str.getbyte(1).should == 254 + end + + it "can invalidate a String's encoding" do + str = "glark" + str.valid_encoding?.should be_true + str.setbyte(2,253) + str.valid_encoding?.should be_false + end + + it "regards a negative index as counting from the end of the String" do + str = "hedgehog" + str.setbyte(-3, 108) + str.should == "hedgelog" + + # copy-on-write case + str1, str2 = "fooXbar".split("X") + str2.setbyte(-1, 50) + str2.should == "ba2" + str1.should == "foo" + end + + it "raises an IndexError if the index is greater than the String bytesize" do + lambda { "?".setbyte(1, 97) }.should raise_error(IndexError) + end + + it "raises an IndexError if the nexgative index is greater magnitude than the String bytesize" do + lambda { "???".setbyte(-5, 97) }.should raise_error(IndexError) + end + + it "sets a byte at an index greater than String size" do + chr = "\u{998}" + chr.bytesize.should == 3 + chr.setbyte(2, 150) + chr.should == "\xe0\xa6\x96" + end + + it "does not modify the original string when using String.new" do + str1 = "hedgehog" + str2 = String.new(str1) + str2.setbyte(0, 108) + str2.should == "ledgehog" + str2.should_not == "hedgehog" + str1.should == "hedgehog" + str1.should_not == "ledgehog" + end + + it "raises a RuntimeError if self is frozen" do + str = "cold".freeze + str.frozen?.should be_true + lambda { str.setbyte(3,96) }.should raise_error(RuntimeError) + end + + it "raises a TypeError unless the second argument is an Integer" do + lambda { "a".setbyte(0,'a') }.should raise_error(TypeError) + end + + it "calls #to_int to convert the index" do + index = mock("setbyte index") + index.should_receive(:to_int).and_return(1) + + str = "hat" + str.setbyte(index, "i".ord) + str.should == "hit" + end + + it "calls to_int to convert the value" do + value = mock("setbyte value") + value.should_receive(:to_int).and_return("i".ord) + + str = "hat" + str.setbyte(1, value) + str.should == "hit" + end +end |