Hello Jon,
Thanks for your reply.
I modified it as:
RSpec::Matchers.define :have_constant do |const|
match do |owner|
@actual = owner.const_defined?(const) && owner.const_get(const)
@expected = @second
owner.const_defined?(const) && owner.const_get(const) == @second
end
chain :with_value do |second|
@second = second
end
diffable
failure_message do |actual|
"expected that #{const} would be defined with #{actual} but got
#{@second}"
end
end
Now the error message is close, but not quiet correct.
Failures:
1) FeatureService constants should have constant
:TABLE_OF_PREVIOUS_INSPECTIONS with value "3oelqiFW1"
Failure/Error: it { is_expected.to
have_constant(:TABLE_OF_PREVIOUS_INSPECTIONS).with_value('3oelqiFW1') }
expected that TABLE_OF_PREVIOUS_INSPECTIONS would be defined with
3oelqiFW but got 3oelqiFW1
Diff:
@@ -1,2 +1,2 @@
-:TABLE_OF_PREVIOUS_INSPECTIONS
+"3oelqiFW"
I want it to be like:
Failures:
1) FeatureService constants should have constant
:TABLE_OF_PREVIOUS_INSPECTIONS with value "3oelqiFW1"
Failure/Error: it { is_expected.to
have_constant(:TABLE_OF_PREVIOUS_INSPECTIONS).with_value('3oelqiFW1') }
expected that TABLE_OF_PREVIOUS_INSPECTIONS would be defined with
3oelqiFW but got 3oelqiFW1
Diff:
@@ -1,2 +1,2 @@
-"3oelqiFW1"
+"3oelqiFW"
What needs to be tweaked ?
On Monday, May 13, 2019 at 2:39:27 PM UTC+5:30, Jon Rowe wrote:
>
> Hi Arup
>
> You need to define `expected` and `actual` to surface the variables you
> wish to diff. In your case `expected` should be `@second` and `actual`
> should be `owner.const_defined?(const) && owner.const_get(const)`.
>
> See the matcher protocol documentation for more information.
>
>
> http://rspec.info/documentation/3.8/rspec-expectations/RSpec/Matchers/MatcherProtocol.html#diffable%3F-instance_method
>
> Cheers
> Jon Rowe
> ---------------------------
> [email protected] <javascript:>
> jonrowe.co.uk
>
> On 13 May 2019 at 10:56, Arup Rakshit wrote:
>
> Hi,
>
> I am trying to write a custom matcher, but not able to show the diff and
> error message correctly. I need help with it.
>
> RSpec::Matchers.define :have_constant do |const|
> match do |owner|
> owner.const_defined?(const) && owner.const_get(const) == @second
> end
>
> chain :with_value do |second|
> @second = second
> end
>
> diffable
>
> failure_message do |actual|
> "expected that #{const} would be defined in #{actual} with #{@second}"
> end
> end
>
> And the spec is:
>
> describe "FeatureService" do
> describe 'constants' do
> subject { FeatureService }
>
> it { is_expected.to
> have_constant(:IMO_NUMBER_VALIDATION).with_value('6cjXBWdq') }
> it { is_expected.to have_constant(:JOB_TYPES).with_value('6cjXBWdq') }
> # ...
> end
> end
>
> The actual class is:
>
> class FeatureService
> JOB_TYPES = 'WN2HsoIm'.freeze
>
> #...
> end
>
> When I run the test the failure message is not quiet helpful. So how can I
> tweak the custom matcher so that it can be helpful when it writes to stdout
> than what I see currently.
>
> $ rspec ./spec/services/feature_service_spec.rb:8
> Run options: include
> {:locations=>{"./spec/services/feature_service_spec.rb"=>[8]}}
> F
>
> Failures:
>
> 1) FeatureService constants should have constant :JOB_TYPES with value
> "6cjXBWdq"
> Failure/Error: it { is_expected.to
> have_constant(:JOB_TYPES).with_value('6cjXBWdq') }
>
> expected that JOB_TYPES would be defined in FeatureService with
> 6cjXBWdq
> Diff:
> @@ -1,2 +1,2 @@
> -:JOB_TYPES
> +FeatureService
>
> # ./spec/services/feature_service_spec.rb:8:in `block (3 levels) in
> <top (required)>'
>
>
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