diff options
Diffstat (limited to 'spec/ruby/core/string/unpack/x_spec.rb')
-rw-r--r-- | spec/ruby/core/string/unpack/x_spec.rb | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/spec/ruby/core/string/unpack/x_spec.rb b/spec/ruby/core/string/unpack/x_spec.rb new file mode 100644 index 0000000000..e765472413 --- /dev/null +++ b/spec/ruby/core/string/unpack/x_spec.rb @@ -0,0 +1,62 @@ +# -*- encoding: ascii-8bit -*- +require File.expand_path('../../../../spec_helper', __FILE__) +require File.expand_path('../../fixtures/classes', __FILE__) +require File.expand_path('../shared/basic', __FILE__) + +describe "String#unpack with format 'X'" do + it_behaves_like :string_unpack_basic, 'X' + it_behaves_like :string_unpack_no_platform, 'X' + + it "moves the read index back by the number of bytes specified by count" do + "\x01\x02\x03\x04".unpack("C3X2C").should == [1, 2, 3, 2] + end + + it "does not change the read index when passed a count of zero" do + "\x01\x02\x03\x04".unpack("C3X0C").should == [1, 2, 3, 4] + end + + it "implicitly has a count of one when count is not specified" do + "\x01\x02\x03\x04".unpack("C3XC").should == [1, 2, 3, 3] + end + + it "moves the read index back by the remaining bytes when passed the '*' modifier" do + "abcd".unpack("C3X*C").should == [97, 98, 99, 99] + end + + it "raises an ArgumentError when passed the '*' modifier if the remaining bytes exceed the bytes from the index to the start of the String" do + lambda { "abcd".unpack("CX*C") }.should raise_error(ArgumentError) + end + + it "raises an ArgumentError if the count exceeds the bytes from current index to the start of the String" do + lambda { "\x01\x02\x03\x04".unpack("C3X4C") }.should raise_error(ArgumentError) + end +end + +describe "String#unpack with format 'x'" do + it_behaves_like :string_unpack_basic, 'x' + it_behaves_like :string_unpack_no_platform, 'x' + + it "moves the read index forward by the number of bytes specified by count" do + "\x01\x02\x03\x04".unpack("Cx2C").should == [1, 4] + end + + it "implicitly has a count of one when count is not specified" do + "\x01\x02\x03\x04".unpack("CxC").should == [1, 3] + end + + it "does not change the read index when passed a count of zero" do + "\x01\x02\x03\x04".unpack("Cx0C").should == [1, 2] + end + + it "moves the read index to the end of the string when passed the '*' modifier" do + "\x01\x02\x03\x04".unpack("Cx*C").should == [1, nil] + end + + it "positions the read index one beyond the last readable byte in the String" do + "\x01\x02\x03\x04".unpack("C2x2C").should == [1, 2, nil] + end + + it "raises an ArgumentError if the count exceeds the size of the String" do + lambda { "\x01\x02\x03\x04".unpack("C2x3C") }.should raise_error(ArgumentError) + end +end |