Hello!
- -This lab teaches basic Ruby function syntax.
- -Open a terminal in this directory
- -cd 00_hello
-This directory is the starting point for this exercise. It contains a spec file and you'll be adding a ruby file to (eventually) make the specs pass.
- -Run the test
- -rake
-Watch it fail
- -You should see an error. Don't get scared! Try to read it and figure out what the computer wants to tell you. Somewhere on the first line it should say something like
- -no such file to load -- test-first-teaching/hello/hello (LoadError)
-That means that it is looking for a file called hello.rb and can't find it.
Create hello.rb
- -Open up hello.rb in a text editor. Save it. Run the test again.
rake
-Watch it fail
- -Now you should see an error like this:
- -the hello function
- says hello (FAILED - 1)
-
-Failures:
-
- 1) the hello function says hello
- Failure/Error: hello.should == "Hello!"
- NameError:
- undefined local variable or method `hello' for #<RSpec::Core::ExampleGroup::Nested_1:0x000001009b8808>
- # ./hello/hello_spec.rb:5:in `block (2 levels) in <top (required)>'
-Create the hello function
- -Fix this by opening hello.rb and creating an empty function:
def hello
-end
-Save it. Run the test again.
- -Watch it fail
- -Now you should see an error like this:
- -the hello function
- says hello (FAILED - 1)
-
-Failures:
-
- 1) the hello function says hello
- Failure/Error: hello().should == "Hello!"
- expected: "Hello!"
- got: nil (using ==)
- # ./hello/hello_spec.rb:5:in `block (2 levels) in <top (required)>'
-This means that while it found the file, and it found the function, it's not returning anything! ("nil" is the Ruby way of saying "not anything".)
- -Make it return something
- -Inside the "hello" function, put a single line containing a string that is not "Hello!". (Here we are simulating you making an honest mistake, so we can see what the error message looks like.)
- -def hello
- "whuh?"
-end
-Save it. Run the test again.
- -Watch it fail
- -Now you should see an error like this:
- -1) the hello function says hello
- Failure/Error: hello().should == "Hello!"
- expected: "Hello!"
- got: "whuh?" (using ==)
- # ./hello/hello_spec.rb:5:in `block (2 levels) in <top (required)>'
-Correct this by changing "whuh?" to "Hello!". Save it. Run the test again.
- -Watch it pass!
- -Hooray! Finally! It works!
- -Give yourself a high five
- -Also, sing a song and do a little dance.
- -And then...
- -Fix the next failure! :-)
the hello function
- says hello
-
-the greet function
- says hello to someone (FAILED - 1)
-In order to get the next test to pass, your function will need to accept an argument.
- -def greet(who)
- "Hello, #{who}!"
-end
-Tests
-hello_spec.rb -require "hello"
-
-describe "the hello function" do
- it "says hello" do
- hello.should == "Hello!"
- end
-end
-
-describe "the greet function" do
- it "says hello to someone" do
- greet("Alice").should == "Hello, Alice!"
- end
-
- it "says hello to someone else" do
- greet("Bob").should == "Hello, Bob!"
- end
-end
-