# Parse Student Code

Often you just want to make sure students successfully used a particular function/command/structure.  The simplest way I have found to do this is just parse the student's code file and make sure what you are looking for is there.

The following example looks for the `for` keyword and checks that the student has used a for loop at least 1 time. 

***Note:** You may want to add more logic to this code if you heavily rely on it.  I have it check if the for is on a line with a comment or in a puts statement but technically there are other ways for students to pass the code by putting a for somewhere.*

**Grading Test:**

```ruby
require 'rspec'
require 'stringio'

RSpec.describe "CodingRoomsUnitTests" do

    describe "Code requires at least 1 FOR loop" do
        it "checking that coding has >= 1 FOR loop" do
            count = 0
            File.open("/usercode/example.rb").each do |line|
                if (line.include?('for') and !(line.include?('#') or line.include?('puts')))
                    count += 1
                end
            end
            expect(count).to be >= 1
        end
    end

end
```