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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:
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require 'rspec'
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require 'stringio'
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require '/usercode/example'
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RSpec.describe "CodingRoomsUnitTests" do
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    describe "Run prints_name() with 'Jane'" do
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        it "expects output to be 'Hello, Jane!'" do
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            expect{prints_name("Jane")}.to output("Hello, Jane!\n").to_stdout
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        end
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    end
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    describe "Run prints_name() with 'Fred'" do
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        it "expects output to be 'Hello, Fred!'" do
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            expect{prints_name("Fred")}.to output("Hello, Fred!\n").to_stdout
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        end
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    end
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end
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Sample Solution:
example.rb
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def prints_name(name)
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    puts 'Hello, ' + name + "!"
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end
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prints_name("Jane")
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