1 files changed, 47 insertions, 0 deletions
diff --git a/spec/rubyspec/core/string/plus_spec.rb b/spec/rubyspec/core/string/plus_spec.rb
new file mode 100644
index 0000000000..addc8873eb
--- /dev/null
+++ b/spec/rubyspec/core/string/plus_spec.rb
@@ -0,0 +1,47 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+require File.expand_path('../shared/concat', __FILE__)
+
+describe "String#+" do
+  it "returns a new string containing the given string concatenated to self" do
+    ("" + "").should == ""
+    ("" + "Hello").should == "Hello"
+    ("Hello" + "").should == "Hello"
+    ("Ruby !" + "= Rubinius").should == "Ruby != Rubinius"
+  end
+
+  it "converts any non-String argument with #to_str" do
+    c = mock 'str'
+    c.should_receive(:to_str).any_number_of_times.and_return(' + 1 = 2')
+
+    ("1" + c).should == '1 + 1 = 2'
+  end
+
+  it "raises a TypeError when given any object that fails #to_str" do
+    lambda { "" + Object.new }.should raise_error(TypeError)
+    lambda { "" + 65 }.should raise_error(TypeError)
+  end
+
+  it "doesn't return subclass instances" do
+    (StringSpecs::MyString.new("hello") + "").should be_an_instance_of(String)
+    (StringSpecs::MyString.new("hello") + "foo").should be_an_instance_of(String)
+    (StringSpecs::MyString.new("hello") + StringSpecs::MyString.new("foo")).should be_an_instance_of(String)
+    (StringSpecs::MyString.new("hello") + StringSpecs::MyString.new("")).should be_an_instance_of(String)
+    (StringSpecs::MyString.new("") + StringSpecs::MyString.new("")).should be_an_instance_of(String)
+    ("hello" + StringSpecs::MyString.new("foo")).should be_an_instance_of(String)
+    ("hello" + StringSpecs::MyString.new("")).should be_an_instance_of(String)
+  end
+
+  it "taints the result when self or other is tainted" do
+    strs = ["", "OK", StringSpecs::MyString.new(""), StringSpecs::MyString.new("OK")]
+    strs += strs.map { |s| s.dup.taint }
+
+    strs.each do |str|
+      strs.each do |other|
+        (str + other).tainted?.should == (str.tainted? | other.tainted?)
+      end
+    end
+  end
+
+  it_behaves_like :string_concat_encoding, :+
+end