1 files changed, 27 insertions, 0 deletions
diff --git a/spec/ruby/core/string/concat_spec.rb b/spec/ruby/core/string/concat_spec.rb
new file mode 100644
index 0000000000..cbd7df54e2
--- /dev/null
+++ b/spec/ruby/core/string/concat_spec.rb
@@ -0,0 +1,27 @@
+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
+
+  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 "returns self when given no arguments" do
+    str = +"hello"
+    str.concat.should equal(str)
+    str.should == "hello"
+  end
+end