1 files changed, 105 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/coerce_spec.rb b/spec/ruby/core/integer/coerce_spec.rb
new file mode 100644
index 0000000000..58e0aadc0a
--- /dev/null
+++ b/spec/ruby/core/integer/coerce_spec.rb
@@ -0,0 +1,105 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Integer#coerce" do
+  context "fixnum" do
+    describe "when given a Fixnum" do
+      it "returns an array containing two Fixnums" do
+        1.coerce(2).should == [2, 1]
+        1.coerce(2).map { |i| i.class }.should == [Fixnum, Fixnum]
+      end
+    end
+
+    describe "when given a String" do
+      it "raises an ArgumentError when trying to coerce with a non-number String" do
+        lambda { 1.coerce(":)") }.should raise_error(ArgumentError)
+      end
+
+      it "returns  an array containing two Floats" do
+        1.coerce("2").should == [2.0, 1.0]
+        1.coerce("-2").should == [-2.0, 1.0]
+      end
+    end
+
+    it "raises a TypeError when trying to coerce with nil" do
+      lambda { 1.coerce(nil) }.should raise_error(TypeError)
+    end
+
+    it "tries to convert the given Object into a Float by using #to_f" do
+      (obj = mock('1.0')).should_receive(:to_f).and_return(1.0)
+      2.coerce(obj).should == [1.0, 2.0]
+
+      (obj = mock('0')).should_receive(:to_f).and_return('0')
+      lambda { 2.coerce(obj).should == [1.0, 2.0] }.should raise_error(TypeError)
+    end
+
+    it "raises a TypeError when given an Object that does not respond to #to_f" do
+      lambda { 1.coerce(mock('x'))  }.should raise_error(TypeError)
+      lambda { 1.coerce(1..4)       }.should raise_error(TypeError)
+      lambda { 1.coerce(:test)      }.should raise_error(TypeError)
+    end
+  end
+
+  context "bignum" 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
+end