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Notes

TDD

Fisrst, think about spec, get one test case from spec. (Think: what are the example input and output?)

Spec: 
[ square(x) ]

Test Case:
[ square(2) -> 4 ] #Test 1
[ square(-1) -> 1 ] #Test 2
  1. Write test name
  2. Put in a comment, describe test case (Given, When, Then)
  3. Write code just enough for test to fail
  4. Implement Code
  5. Run test to pass
  • Make sure your test can fail for the right reason

Mocking

[App]  ----- [X] -----> [Console.log()]        (Prod.)
Int.          |            Ext.
              |
              --------> [Mock]
                           Collect & test      (Unit Test.)
                           
main() -> console.log("hello world")

main(writer) -> writer.log("hello world")

writer #1 -> console.log
writer #2 -> collect, assert