power_assert.cr

PowerAssert provides the more powerful assertion to you.

Usage

Very simple.

# spec/my_lib_spec.cr

describe MyLib do
  describe ".major_version" do
    it "should be equal 1" do
      assert MyLib.major_version == 1
    end
  end
end

If MyLib.major_version is 2:

F

Failures:

  1) MyLib .major_version should be equal 1
     Failure/Error: assert MyLib.major_version == 1

         MyLib.major_version == 1
         |                   |  |
         |                   |  1
         |                   false
         2

     # ./spec/my_lib_spec.cr:6

more examples in spec.

🎉 Happy testing! 🎉

Configure

• global_indent : Int : A indent size of assertion messages.
• sort_by : Symbol : Sort order of breakdowns. allowed: :default, :reverse, :left and :right.
• expand_block : Bool : Show block's codes in the breakdown.

Example Outputs

Run crystal spec.

FFFFFF

Failures:

  1) PowerAssert Simple operators should be fail
     Failure/Error: assert 1 == 2

         1 == 2
         | |  |
         | false
         |    |
         |    2
         1

     # ./spec/power_assert_spec.cr:23

  2) PowerAssert Simple operators should be fail
     Failure/Error: assert 1 > 2

         1 > 2
         | | |
         | false
         |   |
         |   2
         1

     # ./spec/power_assert_spec.cr:27

  3) PowerAssert Method call should be fail
     Failure/Error: assert falsey == true

         falsey == true
         |      |  |
         |      false
         |         |
         |         true
         false

     # ./spec/power_assert_spec.cr:33

  4) PowerAssert Method call should be fail
     Failure/Error: assert example.falsey(one, two, three)

         example.falsey(one, two, three)
         |       |      |    |    |
         |       false  |    |    |
         |              1    |    |
         |                   2    |
         |                        3
         #<PowerAssert::Example:0x1087a6ee0>

     # ./spec/power_assert_spec.cr:42

  5) PowerAssert Method call should be fail
     Failure/Error: assert example.one == 2

         example.one == 2
         |       |   |  |
         |       |   false
         |       |      |
         |       |      2
         |       1
         #<PowerAssert::Example:0x1087a6e60>

     # ./spec/power_assert_spec.cr:48

  6) PowerAssert Method call should be fail
     Failure/Error: assert array.any? { |n| n == 0 }.nil?

         array.any? { ... }.nil?
         |     |            |
         |     |            false
         |     false
         [1, 2, 3]

     # ./spec/power_assert_spec.cr:54

Finished in 2.16 milliseconds
6 examples, 6 failures, 0 errors, 0 pending

Failed examples:

crystal spec ./spec/power_assert_spec.cr:22 # PowerAssert Simple operators should be fail
crystal spec ./spec/power_assert_spec.cr:26 # PowerAssert Simple operators should be fail
crystal spec ./spec/power_assert_spec.cr:32 # PowerAssert Method call should be fail
crystal spec ./spec/power_assert_spec.cr:36 # PowerAssert Method call should be fail
crystal spec ./spec/power_assert_spec.cr:45 # PowerAssert Method call should be fail
crystal spec ./spec/power_assert_spec.cr:51 # PowerAssert Method call should be fail
Program terminated abnormally with error code: 256

ToDo

• Support a == b && c == d

License

Distributed under the MIT License. Please see LICENSE for details

Credits

• Sho Kusano @rosylilly for the Crystal implementation
• Takuto Wada @twada for the original JavaScript implementation. power_assert.cr is inspired by power-assert.