1 files changed, 29 insertions, 0 deletions
diff --git a/spec/ruby/core/string/shared/equal_value.rb b/spec/ruby/core/string/shared/equal_value.rb
new file mode 100644
index 0000000000..fccafb5821
--- /dev/null
+++ b/spec/ruby/core/string/shared/equal_value.rb
@@ -0,0 +1,29 @@
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+
+describe :string_equal_value, shared: true do
+  it "returns false if obj does not respond to to_str" do
+    'hello'.send(@method, 5).should be_false
+    not_supported_on :opal do
+      'hello'.send(@method, :hello).should be_false
+    end
+    'hello'.send(@method, mock('x')).should be_false
+  end
+
+  it "returns obj == self if obj responds to to_str" do
+    obj = Object.new
+
+    # String#== merely checks if #to_str is defined. It does
+    # not call it.
+    obj.stub!(:to_str)
+
+    # Don't use @method for :== in `obj.should_receive(:==)`
+    obj.should_receive(:==).and_return(true)
+
+    'hello'.send(@method, obj).should be_true
+  end
+
+  it "is not fooled by NUL characters" do
+    "abc\0def".send(@method, "abc\0xyz").should be_false
+  end
+end