Add specs for rb_check_symbol_cstr()

Author: eregon

spec/ruby/optional/capi/ext/symbol_spec.c

@@ -51,6 +51,10 @@ VALUE symbol_spec_rb_intern_str(VALUE self, VALUE str) {
   return ID2SYM(rb_intern_str(str));
 }
 
+VALUE symbol_spec_rb_check_symbol_cstr(VALUE self, VALUE str) {
+  return rb_check_symbol_cstr(RSTRING_PTR(str), RSTRING_LEN(str), rb_enc_get(str));
+}
+
 VALUE symbol_spec_rb_is_class_id(VALUE self, VALUE sym) {
   return rb_is_class_id(SYM2ID(sym)) ? Qtrue : Qfalse;
 }
@@ -79,6 +83,7 @@ void Init_symbol_spec(void) {
   rb_define_method(cls, "rb_id2name", symbol_spec_rb_id2name, 1);
   rb_define_method(cls, "rb_id2str", symbol_spec_rb_id2str, 1);
   rb_define_method(cls, "rb_intern_str", symbol_spec_rb_intern_str, 1);
+  rb_define_method(cls, "rb_check_symbol_cstr", symbol_spec_rb_check_symbol_cstr, 1);
   rb_define_method(cls, "rb_is_class_id", symbol_spec_rb_is_class_id, 1);
   rb_define_method(cls, "rb_is_const_id", symbol_spec_rb_is_const_id, 1);
   rb_define_method(cls, "rb_is_instance_id", symbol_spec_rb_is_instance_id, 1);

spec/ruby/optional/capi/symbol_spec.rb

@@ -71,6 +71,19 @@
     end
   end
 
+  describe "rb_check_symbol_cstr" do
+    it "returns a Symbol if a Symbol already exists for the given C string" do
+      sym = :test_symbol
+      @s.rb_check_symbol_cstr('test_symbol').should == sym
+    end
+
+    it "returns nil if the Symbol does not exist yet and does not create it" do
+      str = "symbol_does_not_exist_#{Object.new.object_id}_#{rand}"
+      @s.rb_check_symbol_cstr(str).should == nil # does not create the Symbol
+      @s.rb_check_symbol_cstr(str).should == nil
+    end
+  end
+
   describe "rb_is_const_id" do
     it "returns true given a const-like symbol" do
       @s.rb_is_const_id(:Foo).should == true