Add specs for File.new

spec/ruby/core/file/new_spec.rb

@@ -83,13 +83,15 @@
 
     -> { @fh.puts("test") }.should raise_error(IOError)
     @fh.read.should == ""
+    File.should.exist?(@file)
   end
 
   it "returns a new read-only File when mode is not specified but flags option is present" do
     @fh = File.new(@file, flags: File::CREAT)
 
     -> { @fh.puts("test") }.should raise_error(IOError)
     @fh.read.should == ""
+    File.should.exist?(@file)
   end
 
   it "creates a new file when use File::EXCL mode" do
@@ -132,6 +134,26 @@
     File.should.exist?(@file)
   end
 
+  it "returns a new read-only File when use File::RDONLY|File::CREAT mode" do
+    @fh = File.new(@file, File::RDONLY|File::CREAT)
+    @fh.should be_kind_of(File)
+    File.should.exist?(@file)
+
+    # it's read-only
+    -> { @fh.puts("test") }.should raise_error(IOError)
+    @fh.read.should == ""
+  end
+
+  it "returns a new read-only File when use File::CREAT mode" do
+    @fh = File.new(@file, File::CREAT)
+    @fh.should be_kind_of(File)
+    File.should.exist?(@file)
+
+    # it's read-only
+    -> { @fh.puts("test") }.should raise_error(IOError)
+    @fh.read.should == ""
+  end
+
   it "coerces filename using to_str" do
     name = mock("file")
     name.should_receive(:to_str).and_return(@file)