# Print Function Tests

This is an example of how you can test the output stream of a student defined function. 

Ruby makes this super easy with the `output` matcher. 

`expect { print 'foo' }.to output('foo').to_stdout`

This test makes sure the student's function named `prints_name()` that takes a name as a parameter and prints `"Hello, {name provided}!"` to standard output.  It assumes the student's file name is `example.rb`.  Replace the `require` with whatever your student's file name is. 

#### **Grading Tests:**

```ruby
require 'rspec'
require 'stringio'
require '/usercode/example'

RSpec.describe "CodingRoomsUnitTests" do

    describe "Run prints_name() with 'Jane'" do
        it "expects output to be 'Hello, Jane!'" do
            expect{prints_name("Jane")}.to output("Hello, Jane!\n").to_stdout
        end
    end

    describe "Run prints_name() with 'Fred'" do
        it "expects output to be 'Hello, Fred!'" do
            expect{prints_name("Fred")}.to output("Hello, Fred!\n").to_stdout
        end
    end

end

```

#### Sample Solution:

{% code title="example.rb" %}

```ruby
def prints_name(name)
    puts 'Hello, ' + name + "!"
end

prints_name("Jane")
```

{% endcode %}