1 files changed, 114 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/shared/modulo.rb b/spec/ruby/core/integer/shared/modulo.rb
new file mode 100644
index 0000000000..d91af1e924
--- /dev/null
+++ b/spec/ruby/core/integer/shared/modulo.rb
@@ -0,0 +1,114 @@
+describe :integer_modulo, shared: true do
+  context "fixnum" do
+    it "returns the modulus obtained from dividing self by the given argument" do
+      # test all possible combinations:
+      # - integer/double/bignum argument
+      # - positive/negative argument
+      # - positive/negative self
+      # - self greater/smaller than argument
+
+      13.send(@method, 4).should == 1
+      4.send(@method, 13).should == 4
+
+      13.send(@method, 4.0).should == 1
+      4.send(@method, 13.0).should == 4
+
+      (-200).send(@method, 256).should == 56
+      (-1000).send(@method, 512).should == 24
+
+      (-200).send(@method, -256).should == -200
+      (-1000).send(@method, -512).should == -488
+
+      (200).send(@method, -256).should == -56
+      (1000).send(@method, -512).should == -24
+
+      13.send(@method, -4.0).should == -3.0
+      4.send(@method, -13.0).should == -9.0
+
+      -13.send(@method, -4.0).should == -1.0
+      -4.send(@method, -13.0).should == -4.0
+
+      -13.send(@method, 4.0).should == 3.0
+      -4.send(@method, 13.0).should == 9.0
+
+      1.send(@method, 2.0).should == 1.0
+      200.send(@method, bignum_value).should == 200
+
+      4.send(@method, bignum_value(10)).should == 4
+      4.send(@method, -bignum_value(10)).should == -18446744073709551622
+      -4.send(@method, bignum_value(10)).should == 18446744073709551622
+      -4.send(@method, -bignum_value(10)).should == -4
+    end
+
+    it "raises a ZeroDivisionError when the given argument is 0" do
+      -> { 13.send(@method, 0)  }.should raise_error(ZeroDivisionError)
+      -> { 0.send(@method, 0)   }.should raise_error(ZeroDivisionError)
+      -> { -10.send(@method, 0) }.should raise_error(ZeroDivisionError)
+    end
+
+    it "raises a ZeroDivisionError when the given argument is 0 and a Float" do
+      -> { 0.send(@method, 0.0) }.should raise_error(ZeroDivisionError)
+      -> { 10.send(@method, 0.0) }.should raise_error(ZeroDivisionError)
+      -> { -10.send(@method, 0.0) }.should raise_error(ZeroDivisionError)
+    end
+
+    it "raises a TypeError when given a non-Integer" do
+      -> {
+        (obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
+        13.send(@method, obj)
+      }.should raise_error(TypeError)
+      -> { 13.send(@method, "10")    }.should raise_error(TypeError)
+      -> { 13.send(@method, :symbol) }.should raise_error(TypeError)
+    end
+  end
+
+  context "bignum" do
+    before :each do
+      @bignum = bignum_value(10)
+    end
+
+    it "returns the modulus obtained from dividing self by the given argument" do
+      # test all possible combinations:
+      # - integer/double/bignum argument
+      # - positive/negative argument
+      # - positive/negative self
+      # - self greater/smaller than argument
+
+      @bignum.send(@method, 5).should == 1
+      @bignum.send(@method, -5).should == -4
+      (-@bignum).send(@method, 5).should == 4
+      (-@bignum).send(@method, -5).should == -1
+
+      @bignum.send(@method, 2.22).should be_close(1.5603603603605034, TOLERANCE)
+      @bignum.send(@method, -2.22).should be_close(-0.6596396396394968, TOLERANCE)
+      (-@bignum).send(@method, 2.22).should be_close(0.6596396396394968, TOLERANCE)
+      (-@bignum).send(@method, -2.22).should be_close(-1.5603603603605034, TOLERANCE)
+
+      @bignum.send(@method, @bignum + 10).should == 18446744073709551626
+      @bignum.send(@method, -(@bignum + 10)).should == -10
+      (-@bignum).send(@method, @bignum + 10).should == 10
+      (-@bignum).send(@method, -(@bignum + 10)).should == -18446744073709551626
+
+      (@bignum + 10).send(@method, @bignum).should == 10
+      (@bignum + 10).send(@method, -@bignum).should == -18446744073709551616
+      (-(@bignum + 10)).send(@method, @bignum).should == 18446744073709551616
+      (-(@bignum + 10)).send(@method, -@bignum).should == -10
+    end
+
+    it "raises a ZeroDivisionError when the given argument is 0" do
+      -> { @bignum.send(@method, 0) }.should raise_error(ZeroDivisionError)
+      -> { (-@bignum).send(@method, 0) }.should raise_error(ZeroDivisionError)
+    end
+
+    it "raises a ZeroDivisionError when the given argument is 0 and a Float" do
+      -> { @bignum.send(@method, 0.0) }.should raise_error(ZeroDivisionError)
+      -> { -@bignum.send(@method, 0.0) }.should raise_error(ZeroDivisionError)
+    end
+
+    it "raises a TypeError when given a non-Integer" do
+      -> { @bignum.send(@method, mock('10')) }.should raise_error(TypeError)
+      -> { @bignum.send(@method, "10") }.should raise_error(TypeError)
+      -> { @bignum.send(@method, :symbol) }.should raise_error(TypeError)
+    end
+  end
+end