1 files changed, 56 insertions, 0 deletions
diff --git a/spec/ruby/core/float/modulo_spec.rb b/spec/ruby/core/float/modulo_spec.rb
new file mode 100644
index 0000000000..8b7aedf822
--- /dev/null
+++ b/spec/ruby/core/float/modulo_spec.rb
@@ -0,0 +1,56 @@
+require_relative '../../spec_helper'
+
+describe "Float#%" do
+  it "returns self modulo other" do
+    (6543.21 % 137).should be_close(104.21, TOLERANCE)
+    (5667.19 % bignum_value).should be_close(5667.19, TOLERANCE)
+    (6543.21 % 137.24).should be_close(92.9299999999996, TOLERANCE)
+
+    (-1.0 % 1).should == 0
+  end
+
+  it "returns self when modulus is +Infinity" do
+    (4.2 % Float::INFINITY).should == 4.2
+  end
+
+  it "returns -Infinity when modulus is -Infinity" do
+    (4.2 % -Float::INFINITY).should == -Float::INFINITY
+  end
+
+  it "returns NaN when called on NaN or Infinities" do
+    (Float::NAN % 42).should.nan?
+    (Float::INFINITY % 42).should.nan?
+    (-Float::INFINITY % 42).should.nan?
+  end
+
+  it "returns NaN when modulus is NaN" do
+    (4.2 % Float::NAN).should.nan?
+  end
+
+  it "returns -0.0 when called on -0.0 with a non zero modulus" do
+    r = -0.0 % 42
+    r.should == 0
+    (1/r).should < 0
+
+    r = -0.0 % Float::INFINITY
+    r.should == 0
+    (1/r).should < 0
+  end
+
+  it "tries to coerce the modulus" do
+    obj = mock("modulus")
+    obj.should_receive(:coerce).with(1.25).and_return([1.25, 0.5])
+    (1.25 % obj).should == 0.25
+  end
+
+  it "raises a ZeroDivisionError if other is zero" do
+    -> { 1.0 % 0 }.should.raise(ZeroDivisionError)
+    -> { 1.0 % 0.0 }.should.raise(ZeroDivisionError)
+  end
+end
+
+describe "Float#modulo" do
+  it "is an alias of Float#%" do
+    Float.instance_method(:modulo).should == Float.instance_method(:%)
+  end
+end