mocha_result.log

$ ./node_modules/mocha/bin/mocha -r coffee-script -R spec ./sampletest.coffee 


  describeA
    ◦ testA1: beforeEach - A
testA1
    ✓ testA1 
    ◦ testA2: beforeEach - A
testA2
    ✓ testA2 
    describeB
      ◦ testB1: beforeEach - A
beforeEach - B
testB1
      ✓ testB1 


  3 passing (8ms)

sampletest.coffee

require 'coffee-script'

describe 'describeA', ->
  beforeEach ->
    console.log 'beforeEach - A'
  it 'testA1', ->
    console.log 'testA1'
  describe 'describeB', ->
    beforeEach ->
      console.log 'beforeEach - B'
    it 'testB1', ->
      console.log 'testB1'

  it 'testA2', ->
    console.log 'testA2'