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-rw-r--r--spec/ruby/core/string/sum_spec.rb22
1 files changed, 22 insertions, 0 deletions
diff --git a/spec/ruby/core/string/sum_spec.rb b/spec/ruby/core/string/sum_spec.rb
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+++ b/spec/ruby/core/string/sum_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes.rb', __FILE__)
+
+describe "String#sum" do
+ it "returns a basic n-bit checksum of the characters in self" do
+ "ruby".sum.should == 450
+ "ruby".sum(8).should == 194
+ "rubinius".sum(23).should == 881
+ end
+
+ it "tries to convert n to an integer using to_int" do
+ obj = mock('8')
+ obj.should_receive(:to_int).and_return(8)
+
+ "hello".sum(obj).should == "hello".sum(8)
+ end
+
+ it "returns sum of the bytes in self if n less or equal to zero" do
+ "xyz".sum(0).should == 363
+ "xyz".sum(-10).should == 363
+ end
+end