1 files changed, 45 insertions, 2 deletions
diff --git a/spec/ruby/core/integer/minus_spec.rb b/spec/ruby/core/integer/minus_spec.rb
index 6e8fa69759..6a84bca429 100644
--- a/spec/ruby/core/integer/minus_spec.rb
+++ b/spec/ruby/core/integer/minus_spec.rb
@@ -1,7 +1,50 @@
 require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../shared/arithmetic_exception_in_coerce', __FILE__)
+require File.expand_path('../shared/arithmetic_coerce', __FILE__)
 
 describe "Integer#-" do
-  it_behaves_like :integer_arithmetic_exception_in_coerce, :-
+  ruby_version_is "2.4"..."2.5" do
+    it_behaves_like :integer_arithmetic_coerce_rescue, :-
+  end
+
+  ruby_version_is "2.5" do
+    it_behaves_like :integer_arithmetic_coerce_not_rescue, :-
+  end
+
+  context "fixnum" do
+    it "returns self minus the given Integer" do
+      (5 - 10).should == -5
+      (9237212 - 5_280).should == 9231932
+
+      (781 - 0.5).should == 780.5
+      (2_560_496 - bignum_value).should == -9223372036852215312
+    end
+
+    it "raises a TypeError when given a non-Integer" do
+      lambda {
+        (obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
+        13 - obj
+      }.should raise_error(TypeError)
+      lambda { 13 - "10"    }.should raise_error(TypeError)
+      lambda { 13 - :symbol }.should raise_error(TypeError)
+    end
+  end
+
+  context "bignum" do
+    before :each do
+      @bignum = bignum_value(314)
+    end
+
+    it "returns self minus the given Integer" do
+      (@bignum - 9).should == 9223372036854776113
+      (@bignum - 12.57).should be_close(9223372036854776109.43, TOLERANCE)
+      (@bignum - bignum_value(42)).should == 272
+    end
+
+    it "raises a TypeError when given a non-Integer" do
+      lambda { @bignum - mock('10') }.should raise_error(TypeError)
+      lambda { @bignum - "10" }.should raise_error(TypeError)
+      lambda { @bignum - :symbol }.should raise_error(TypeError)
+    end
+  end
 end