Week 2 and 3 Diagnostic

week 2 and 3 diagnostic

```class PizzaOven

  def cook_pizza
    "mmm 'za"
  end
  
end```

```class Student 

  def initialize (name)
  @name = name
  end
  
  def name
  @name
  end
end``` This could be replaced with an attr_reader for name

```numbers = [1,2,3,4,5]
numbers.map! {|num| num*2}
sum = 0
numbers.each {|num| sum+=num}```

git init - creates new git respository for folder you are in

Pizza
```def test_that_is_tasty_returns_true
pie = Pizza.new

assert pie.is_tasty
end ```

``` def test_what_style_of_pizza
pie = pizza.new

assert_equal "suppreme" || "mediterranean" || "cheese", pie.style 
end ```

git add . - stages files
git commit -m "commit message here" - commits the files 

Student
```class Student

  attr_reader :attitude :assignments
  
  def initialize 
   @attitude = "cheerful"
   @assignments = ""
  end
  
  def assign_homework(assignment)
  assignments << assignment + ", "
   if attitude == "cheerful"
    attitude = "dubious"
   elsif attitude == "dubious"
    attitude = "perturbed"
   elsif attitude == "perturbed"
    attitude = "dazed"
   else
    attitude
   end
  end
  
end ```

to get all students' assignments:
```students.assignments ```

code would output:
"x: 4"
"b: 12"

working with files: 
```new_file = File.open(ARGV[0], "r")
puts new_file.readlines ```

writing files:
```file1 = File.open(ARGV[0], "r")
file1.readlines

writer = File.open(ARGV[1], "w")
writer.write(file1.readlines.count) ```

corgi tests:
def test_it_can_be_created_with_no_arguments
  new_corgi = Corgi.new

  assert_instance_of Corgi, new_corgi 
end

def test_it_can_be_assigned_name
  new_corgi = Corgi.new
  new_corgi.assign_name("Fred")
  
  assert_equal "Fred", new_corgi.name
end

def test_it_can_be_asked_for_its_name
  new_corgi = Corgi.new
  new_corgi.assign_name("Suzy")
  
  assert_equal "Suzy", new_corgi.give_name
end

def test_its_default_posture_is_standing
  new_corgi = Corgi.new
  
  assert_equal "standing", new_corgi.posture
end

def test_its_posture_can_change_to_laying
  new_corgi = Corgi.new
  new_corgi.lie_down
  
  assert_equal "laying", new_corgi.posture 
end