1 files changed, 160 insertions, 0 deletions
diff --git a/spec/rubyspec/core/string/shared/concat.rb b/spec/rubyspec/core/string/shared/concat.rb
new file mode 100644
index 0000000000..7da995fdc7
--- /dev/null
+++ b/spec/rubyspec/core/string/shared/concat.rb
@@ -0,0 +1,160 @@
+describe :string_concat, shared: true do
+  it "concatenates the given argument to self and returns self" do
+    str = 'hello '
+    str.send(@method, 'world').should equal(str)
+    str.should == "hello world"
+  end
+
+  it "converts the given argument to a String using to_str" do
+    obj = mock('world!')
+    obj.should_receive(:to_str).and_return("world!")
+    a = 'hello '.send(@method, obj)
+    a.should == 'hello world!'
+  end
+
+  it "raises a TypeError if the given argument can't be converted to a String" do
+    lambda { 'hello '.send(@method, [])        }.should raise_error(TypeError)
+    lambda { 'hello '.send(@method, mock('x')) }.should raise_error(TypeError)
+  end
+
+  it "raises a RuntimeError when self is frozen" do
+    a = "hello"
+    a.freeze
+
+    lambda { a.send(@method, "")     }.should raise_error(RuntimeError)
+    lambda { a.send(@method, "test") }.should raise_error(RuntimeError)
+  end
+
+  it "returns a String when given a subclass instance" do
+    a = "hello"
+    a.send(@method, StringSpecs::MyString.new(" world"))
+    a.should == "hello world"
+    a.should be_an_instance_of(String)
+  end
+
+  it "returns an instance of same class when called on a subclass" do
+    str = StringSpecs::MyString.new("hello")
+    str.send(@method, " world")
+    str.should == "hello world"
+    str.should be_an_instance_of(StringSpecs::MyString)
+  end
+
+  it "taints self if other is tainted" do
+    "x".send(@method, "".taint).tainted?.should == true
+    "x".send(@method, "y".taint).tainted?.should == true
+  end
+
+  it "untrusts self if other is untrusted" do
+    "x".send(@method, "".untrust).untrusted?.should == true
+    "x".send(@method, "y".untrust).untrusted?.should == true
+  end
+
+  describe "with Integer" do
+    it "concatencates the argument interpreted as a codepoint" do
+      b = "".send(@method, 33)
+      b.should == "!"
+
+      b.encode!(Encoding::UTF_8)
+      b.send(@method, 0x203D)
+      b.should == "!\u203D"
+    end
+
+    # #5855
+    it "returns a ASCII-8BIT string if self is US-ASCII and the argument is between 128-255 (inclusive)" do
+      a = ("".encode(Encoding::US_ASCII).send(@method, 128))
+      a.encoding.should == Encoding::ASCII_8BIT
+      a.should == 128.chr
+
+      a = ("".encode(Encoding::US_ASCII).send(@method, 255))
+      a.encoding.should == Encoding::ASCII_8BIT
+      a.should == 255.chr
+    end
+
+    it "raises RangeError if the argument is an invalid codepoint for self's encoding" do
+      lambda { "".encode(Encoding::US_ASCII).send(@method, 256) }.should raise_error(RangeError)
+      lambda { "".encode(Encoding::EUC_JP).send(@method, 0x81)  }.should raise_error(RangeError)
+    end
+
+    it "raises RangeError if the argument is negative" do
+      lambda { "".send(@method, -200)          }.should raise_error(RangeError)
+      lambda { "".send(@method, -bignum_value) }.should raise_error(RangeError)
+    end
+
+    it "doesn't call to_int on its argument" do
+      x = mock('x')
+      x.should_not_receive(:to_int)
+
+      lambda { "".send(@method, x) }.should raise_error(TypeError)
+    end
+
+    it "raises a RuntimeError when self is frozen" do
+      a = "hello"
+      a.freeze
+
+      lambda { a.send(@method, 0)  }.should raise_error(RuntimeError)
+      lambda { a.send(@method, 33) }.should raise_error(RuntimeError)
+    end
+  end
+end
+
+describe :string_concat_encoding, shared: true do
+  describe "when self is in an ASCII-incompatible encoding incompatible with the argument's encoding" do
+    it "uses self's encoding if both are empty" do
+      "".encode("UTF-16LE").send(@method, "").encoding.should == Encoding::UTF_16LE
+    end
+
+    it "uses self's encoding if the argument is empty" do
+      "x".encode("UTF-16LE").send(@method, "").encoding.should == Encoding::UTF_16LE
+    end
+
+    it "uses the argument's encoding if self is empty" do
+      "".encode("UTF-16LE").send(@method, "x".encode("UTF-8")).encoding.should == Encoding::UTF_8
+    end
+
+    it "raises Encoding::CompatibilityError if neither are empty" do
+      lambda { "x".encode("UTF-16LE").send(@method, "y".encode("UTF-8")) }.should raise_error(Encoding::CompatibilityError)
+    end
+  end
+
+  describe "when the argument is in an ASCII-incompatible encoding incompatible with self's encoding" do
+    it "uses self's encoding if both are empty" do
+      "".encode("UTF-8").send(@method, "".encode("UTF-16LE")).encoding.should == Encoding::UTF_8
+    end
+
+    it "uses self's encoding if the argument is empty" do
+      "x".encode("UTF-8").send(@method, "".encode("UTF-16LE")).encoding.should == Encoding::UTF_8
+    end
+
+    it "uses the argument's encoding if self is empty" do
+      "".encode("UTF-8").send(@method, "x".encode("UTF-16LE")).encoding.should == Encoding::UTF_16LE
+    end
+
+    it "raises Encoding::CompatibilityError if neither are empty" do
+      lambda { "x".encode("UTF-8").send(@method, "y".encode("UTF-16LE")) }.should raise_error(Encoding::CompatibilityError)
+    end
+  end
+
+  describe "when self and the argument are in different ASCII-compatible encodings" do
+    it "uses self's encoding if both are ASCII-only" do
+      "abc".encode("UTF-8").send(@method, "123".encode("SHIFT_JIS")).encoding.should == Encoding::UTF_8
+    end
+
+    it "uses self's encoding if the argument is ASCII-only" do
+      "\u00E9".encode("UTF-8").send(@method, "123".encode("ISO-8859-1")).encoding.should == Encoding::UTF_8
+    end
+
+    it "uses the argument's encoding if self is ASCII-only" do
+      "abc".encode("UTF-8").send(@method, "\u00E9".encode("ISO-8859-1")).encoding.should == Encoding::ISO_8859_1
+    end
+
+    it "raises Encoding::CompatibilityError if neither are ASCII-only" do
+      lambda { "\u00E9".encode("UTF-8").send(@method, "\u00E9".encode("ISO-8859-1")) }.should raise_error(Encoding::CompatibilityError)
+    end
+  end
+
+  describe "when self is ASCII-8BIT and argument is US-ASCII" do
+    it "uses ASCII-8BIT encoding" do
+      "abc".encode("ASCII-8BIT").send(@method, "123".encode("US-ASCII")).encoding.should == Encoding::ASCII_8BIT
+    end
+  end
+end