1 files changed, 59 insertions, 0 deletions
diff --git a/spec/ruby/core/numeric/coerce_spec.rb b/spec/ruby/core/numeric/coerce_spec.rb
new file mode 100644
index 0000000000..9344d99ee6
--- /dev/null
+++ b/spec/ruby/core/numeric/coerce_spec.rb
@@ -0,0 +1,59 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Numeric#coerce" do
+  before :each do
+    @obj = NumericSpecs::Subclass.new
+    @obj.should_receive(:to_f).any_number_of_times.and_return(10.5)
+  end
+
+  it "returns [other, self] if self and other are instances of the same class" do
+    a = NumericSpecs::Subclass.new
+    b = NumericSpecs::Subclass.new
+
+    a.coerce(b).should == [b, a]
+  end
+
+  # I (emp) think that this behavior is actually a bug in MRI. It's here as documentation
+  # of the behavior until we find out if it's a bug.
+  quarantine! do
+    it "considers the presence of a metaclass when checking the class of the objects" do
+      a = NumericSpecs::Subclass.new
+      b = NumericSpecs::Subclass.new
+
+      # inject a metaclass on a
+      class << a; true; end
+
+      # watch it explode
+      -> { a.coerce(b) }.should.raise(TypeError)
+    end
+  end
+
+  it "returns [other.to_f, self.to_f] if self and other are instances of different classes" do
+    @obj.coerce(2.5).should == [2.5, 10.5]
+    @obj.coerce(3).should == [3.0, 10.5]
+    @obj.coerce("4.4").should == [4.4, 10.5]
+    @obj.coerce(bignum_value).should == [bignum_value.to_f, 10.5]
+  end
+
+  it "raise TypeError if they are instances of different classes and other does not respond to #to_f" do
+    other = mock("numeric")
+    -> { @obj.coerce(other)   }.should.raise(TypeError)
+  end
+
+  it "raises a TypeError when passed nil" do
+    -> { @obj.coerce(nil)     }.should.raise(TypeError)
+  end
+
+  it "raises a TypeError when passed a boolean" do
+    -> { @obj.coerce(false)   }.should.raise(TypeError)
+  end
+
+  it "raises a TypeError when passed a Symbol" do
+    -> { @obj.coerce(:symbol) }.should.raise(TypeError)
+  end
+
+  it "raises an ArgumentError when passed a non-numeric String" do
+    -> { @obj.coerce("test")  }.should.raise(ArgumentError)
+  end
+end