Add in-tree mspec and ruby/spec

* For easier modifications of ruby/spec by MRI developers.
* .gitignore: track changes under spec.
* spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec.
  These files can therefore be updated like any other file in MRI.
  Instructions are provided in spec/README.
  [Feature #13156] [ruby-core:79246]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 65 insertions, 0 deletions

diff --git a/spec/rubyspec/core/bignum/coerce_spec.rb b/spec/rubyspec/core/bignum/coerce_spec.rb
new file mode 100644
index 0000000000..40decaf51a
--- /dev/null
+++ b/spec/rubyspec/core/bignum/coerce_spec.rb
@@ -0,0 +1,65 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Bignum#coerce" do
+  it "coerces other to a Bignum and returns [other, self] when passed a Fixnum" do
+    a = bignum_value
+    ary = a.coerce(2)
+
+    ary[0].should be_kind_of(Bignum)
+    ary[1].should be_kind_of(Bignum)
+    ary.should == [2, a]
+  end
+
+  it "returns [other, self] when passed a Bignum" do
+    a = bignum_value
+    b = bignum_value
+    ary = a.coerce(b)
+
+    ary[0].should be_kind_of(Bignum)
+    ary[1].should be_kind_of(Bignum)
+    ary.should == [b, a]
+  end
+
+  it "raises a TypeError when not passed a Fixnum or Bignum" do
+    a = bignum_value
+
+    lambda { a.coerce(nil)         }.should raise_error(TypeError)
+    lambda { a.coerce(mock('str')) }.should raise_error(TypeError)
+    lambda { a.coerce(1..4)        }.should raise_error(TypeError)
+    lambda { a.coerce(:test)       }.should raise_error(TypeError)
+  end
+
+  ruby_version_is ""..."2.4" do
+    it "raises a TypeError when passed a String" do
+      a = bignum_value
+      lambda { a.coerce("123") }.should raise_error(TypeError)
+    end
+
+    it "raises a TypeError when passed a Float" do
+      a = bignum_value
+      lambda { a.coerce(12.3) }.should raise_error(TypeError)
+    end
+  end
+
+  ruby_version_is "2.4" do
+    it "coerces both values to Floats and returns [other, self] when passed a Float" do
+      a = bignum_value
+      a.coerce(1.2).should == [1.2, a.to_f]
+    end
+
+    it "coerces both values to Floats and returns [other, self] when passed a String" do
+      a = bignum_value
+      a.coerce("123").should == [123.0, a.to_f]
+    end
+
+    it "calls #to_f to coerce other to a Float" do
+      b = mock("bignum value")
+      b.should_receive(:to_f).and_return(1.2)
+
+      a = bignum_value
+      ary = a.coerce(b)
+
+      ary.should == [1.2, a.to_f]
+    end
+  end
+end