clock/clock_test.rb at master · RenCarothers/clock · GitHub

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# clock_test.rb
# clock_test.rb

require 'minitest/autorun'
require 'minitest/reporters'
require_relative '../lib/clock'

Minitest::Reporters.use!

describe "clock" do
  it "can be called with hours, minutes and seconds as arguments" do
    # Arrange
    hours = 11
    minutes = 14
    seconds = 27

    # Act
    time = clock(hours, minutes, seconds)

    # Assert
    # the `clock` method must return a string
    expect(time).must_be_instance_of String
  end

  it "will return a string formatted in hh:mm:ss format" do
    # Arrange
    hours = 11
    minutes = 14
    seconds = 27

    # Act
    time = clock(hours, minutes, seconds)

    # Assert
    expect((time)).must_equal "11:14:27"
  end

  it "will display leading zeros for numbers smaller than 10" do
    time = clock(11, 8, 14)
    expect(time).must_equal "11:08:14"

    time = clock(8, 11, 14);
    expect(time).must_equal "08:11:14"

    time = clock(11, 14, 8);
    expect(time).must_equal "11:14:08"
  end

  it "will raise an error when given an invalid argument" do
    expect {
      clock(25, 14, 8)
    }.must_raise ArgumentError

    expect {
      clock(11, 60, 8)
    }.must_raise ArgumentError

    expect {
      clock(11, 14, 60)
    }.must_raise ArgumentError

    expect {
      clock(11, 14, -1)
    }.must_raise ArgumentError
  end

end