1 files changed, 33 insertions, 0 deletions
diff --git a/spec/ruby/shared/rational/arithmetic_exception_in_coerce.rb b/spec/ruby/shared/rational/arithmetic_exception_in_coerce.rb
new file mode 100644
index 0000000000..0b09ec5265
--- /dev/null
+++ b/spec/ruby/shared/rational/arithmetic_exception_in_coerce.rb
@@ -0,0 +1,33 @@
+require File.expand_path('../../../fixtures/rational', __FILE__)
+
+describe :rational_arithmetic_exception_in_coerce, shared: true do
+  ruby_version_is ""..."2.5" do
+    it "rescues exception (StandardError and subclasses) raised in other#coerce and raises TypeError" do
+      b = mock("numeric with failed #coerce")
+      b.should_receive(:coerce).and_raise(RationalSpecs::CoerceError)
+
+      # e.g. Rational(3, 4) + b
+      -> { Rational(3, 4).send(@method, b) }.should raise_error(TypeError, /MockObject can't be coerced into Rational/)
+    end
+
+    it "does not rescue Exception and StandardError siblings raised in other#coerce" do
+      [Exception, NoMemoryError].each do |exception|
+        b = mock("numeric with failed #coerce")
+        b.should_receive(:coerce).and_raise(exception)
+
+        # e.g. Rational(3, 4) + b
+        -> { Rational(3, 4).send(@method, b) }.should raise_error(exception)
+      end
+    end
+  end
+
+  ruby_version_is "2.5" do
+    it "does not rescue exception raised in other#coerce" do
+      b = mock("numeric with failed #coerce")
+      b.should_receive(:coerce).and_raise(RationalSpecs::CoerceError)
+
+      # e.g. Rational(3, 4) + b
+      -> { Rational(3, 4).send(@method, b) }.should raise_error(RationalSpecs::CoerceError)
+    end
+  end
+end