1 files changed, 18 insertions, 19 deletions
diff --git a/spec/ruby/core/string/concat_spec.rb b/spec/ruby/core/string/concat_spec.rb
index 939be5ed0a..0194a357a0 100644
--- a/spec/ruby/core/string/concat_spec.rb
+++ b/spec/ruby/core/string/concat_spec.rb
@@ -1,28 +1,27 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/concat', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/concat'
 
 describe "String#concat" do
   it_behaves_like :string_concat, :concat
   it_behaves_like :string_concat_encoding, :concat
+  it_behaves_like :string_concat_type_coercion, :concat
 
-  ruby_version_is "2.4" do
-    it "takes multiple arguments" do
-      str = "hello "
-      str.concat "wo", "", "rld"
-      str.should == "hello world"
-    end
+  it "takes multiple arguments" do
+    str = +"hello "
+    str.concat "wo", "", "rld"
+    str.should == "hello world"
+  end
 
-    it "concatenates the initial value when given arguments contain 2 self" do
-      str = "hello"
-      str.concat str, str
-      str.should == "hellohellohello"
-    end
+  it "concatenates the initial value when given arguments contain 2 self" do
+    str = +"hello"
+    str.concat str, str
+    str.should == "hellohellohello"
+  end
 
-    it "returns self when given no arguments" do
-      str = "hello"
-      str.concat.should equal(str)
-      str.should == "hello"
-    end
+  it "returns self when given no arguments" do
+    str = +"hello"
+    str.concat.should.equal?(str)
+    str.should == "hello"
   end
 end