1 files changed, 28 insertions, 0 deletions
diff --git a/spec/ruby/core/string/include_spec.rb b/spec/ruby/core/string/include_spec.rb
new file mode 100644
index 0000000000..8da12a9862
--- /dev/null
+++ b/spec/ruby/core/string/include_spec.rb
@@ -0,0 +1,28 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes.rb', __FILE__)
+
+describe "String#include? with String" do
+  it "returns true if self contains other_str" do
+    "hello".include?("lo").should == true
+    "hello".include?("ol").should == false
+  end
+
+  it "ignores subclass differences" do
+    "hello".include?(StringSpecs::MyString.new("lo")).should == true
+    StringSpecs::MyString.new("hello").include?("lo").should == true
+    StringSpecs::MyString.new("hello").include?(StringSpecs::MyString.new("lo")).should == true
+  end
+
+  it "tries to convert other to string using to_str" do
+    other = mock('lo')
+    other.should_receive(:to_str).and_return("lo")
+
+    "hello".include?(other).should == true
+  end
+
+  it "raises a TypeError if other can't be converted to string" do
+    lambda { "hello".include?([])       }.should raise_error(TypeError)
+    lambda { "hello".include?('h'.ord)  }.should raise_error(TypeError)
+    lambda { "hello".include?(mock('x')) }.should raise_error(TypeError)
+  end
+end