RSpec_test_check_point3
With this chapter, I learnt the following:
How to,
1. Read Rspec Tests
Methods may not return error, but still may not behave as expected. RSpec helps to test such behaviour.
When tests are written to define future code's behaviour, it is called Test Driven Development (TDD).
RSpec, like most testing frameworks, runs your code in particular conditions and with particular arguments. It sets expectations for the outcome of this process, and the test passes if those expectations are met. In RSpec, instead of returning true/false, the test will either pass or fail depending on if the expectations or met or not. As an example,

describe "greet" do
   it "says hello to someone" do
	greeting = greet("Annie", "Oakley")
	expect(greeting).to eq("Hello Annie Oakley.")
   end
end
The declaration of the method "greet" remains unchanged, but they are enclosed between describe and it lines.
To make the test pass, the definition of the method greet has to be as below:
def greet(first, last)
	"Hello #{first} #{last}. "
end