Updated test doubles (markdown)

John Norman commited 2016-10-02 18:03:40 -0500 commit 7ab96be682a36dc2f9ef1a7db5ed1620c5a67eba

				test-doubles.md
			
          @@ -13,6 +13,26 @@ When we receive a message from another object, we want to verify a state change 

           Example: Suppose we have an object that converts fahrenheit to celsius. When we pass in a measurement

           in fahrenheit, we want to verify that the computation of the celsius value is correct.

          +```ruby

          +require 'minitest/autorun'

          +

          +class TemperatureConverter

          +  def f_to_c(f)

          +    (f - 32.0) * 5.0 / 9.0

          +  end

          +end

          +

          +class TemperatureConverterTest < MiniTest::Test

          +  def setup

          +    @tc = TemperatureConverter.new

          +  end

          +

          +  def test_f_to_c

          +    assert_in_delta 0.0, @tc.f_to_c(32), 0.01

          +  end

          +end

          +```

          +

           ### Testing messages sent to others

           When we send a message to another object that results in a side effect, we want to verify the side effect.

...	...	@@ -13,6 +13,26 @@ When we receive a message from another object, we want to verify a state change
13	13	Example: Suppose we have an object that converts fahrenheit to celsius. When we pass in a measurement
14	14	in fahrenheit, we want to verify that the computation of the celsius value is correct.
15	15
	16	+```ruby
	17	+require 'minitest/autorun'
	18	+
	19	+class TemperatureConverter
	20	+ def f_to_c(f)
	21	+ (f - 32.0) * 5.0 / 9.0
	22	+ end
	23	+end
	24	+
	25	+class TemperatureConverterTest < MiniTest::Test
	26	+ def setup
	27	+ @tc = TemperatureConverter.new
	28	+ end
	29	+
	30	+ def test_f_to_c
	31	+ assert_in_delta 0.0, @tc.f_to_c(32), 0.01
	32	+ end
	33	+end
	34	+```
	35	+
16	36	### Testing messages sent to others
17	37
18	38	When we send a message to another object that results in a side effect, we want to verify the side effect.