1 files changed, 21 insertions, 9 deletions
diff --git a/spec/ruby/core/exception/full_message_spec.rb b/spec/ruby/core/exception/full_message_spec.rb
index b07c6d4829..5a5e0a2b3a 100644
--- a/spec/ruby/core/exception/full_message_spec.rb
+++ b/spec/ruby/core/exception/full_message_spec.rb
@@ -6,10 +6,10 @@ describe "Exception#full_message" do
     e.set_backtrace(["a.rb:1", "b.rb:2"])
 
     full_message = e.full_message
-    full_message.should include "RuntimeError"
-    full_message.should include "Some runtime error"
-    full_message.should include "a.rb:1"
-    full_message.should include "b.rb:2"
+    full_message.should.include? "RuntimeError"
+    full_message.should.include? "Some runtime error"
+    full_message.should.include? "a.rb:1"
+    full_message.should.include? "b.rb:2"
   end
 
   it "supports :highlight option and adds escape sequences to highlight some strings" do
@@ -141,8 +141,8 @@ describe "Exception#full_message" do
       exception = e
     end
 
-    exception.full_message.should include "main exception"
-    exception.full_message.should include "the cause"
+    exception.full_message.should.include? "main exception"
+    exception.full_message.should.include? "the cause"
   end
 
   it 'contains all the chain of exceptions' do
@@ -160,9 +160,9 @@ describe "Exception#full_message" do
       exception = e
     end
 
-    exception.full_message.should include "last exception"
-    exception.full_message.should include "intermediate exception"
-    exception.full_message.should include "origin exception"
+    exception.full_message.should.include? "last exception"
+    exception.full_message.should.include? "intermediate exception"
+    exception.full_message.should.include? "origin exception"
   end
 
   it "relies on #detailed_message" do
@@ -211,4 +211,16 @@ describe "Exception#full_message" do
     e.full_message(highlight: false).lines.first.should =~ /RuntimeError/
     e.full_message(highlight: true).lines.first.should =~ /#{Regexp.escape("\e[1;4mRuntimeError\e[m")}/
   end
+
+  it "allows cause with empty backtrace" do
+    begin
+      raise RuntimeError.new("Some runtime error"), cause: RuntimeError.new("Some other runtime error")
+    rescue => e
+    end
+
+    full_message = e.full_message
+    full_message.should.include? "RuntimeError"
+    full_message.should.include? "Some runtime error"
+    full_message.should.include? "Some other runtime error"
+  end
 end