To add a collaborator to this project you will need to use the Relish gem to add the collaborator via a terminal command. Soon you'll be able to also add collaborators here!
More about adding a collaborator`be_within` matcher
Normal equality expectations do not work well for floating point values.
Consider this irb session:
> radius = 3
=> 3
> area_of_circle = radius * radius * Math::PI
=> 28.2743338823081
> area_of_circle == 28.2743338823081
=> false
Instead, you should use the be_within matcher to check that the value is within a delta of
your expected value:
expect(area_of_circle).to be_within(0.1).of(28.3)
Note that the difference between the actual and expected values must be smaller than your
delta; if it is equal, the matcher will fail.
- Scenarios
-
- basic usage
-
- Given
-
a file named "be_within_matcher_spec.rb" with:
RSpec.describe 27.5 do it { is_expected.to be_within(0.5).of(27.9) } it { is_expected.to be_within(0.5).of(28.0) } it { is_expected.to be_within(0.5).of(27.1) } it { is_expected.to be_within(0.5).of(27.0) } it { is_expected.not_to be_within(0.5).of(28.1) } it { is_expected.not_to be_within(0.5).of(26.9) } # deliberate failures it { is_expected.not_to be_within(0.5).of(28) } it { is_expected.not_to be_within(0.5).of(27) } it { is_expected.to be_within(0.5).of(28.1) } it { is_expected.to be_within(0.5).of(26.9) } end - When
-
I run
rspec be_within_matcher_spec.rb - Then
-
the output should contain all of these:
10 examples, 4 failures expected 27.5 not to be within 0.5 of 28 expected 27.5 not to be within 0.5 of 27 expected 27.5 to be within 0.5 of 28.1 expected 27.5 to be within 0.5 of 26.9
Last published 3 months ago by Jon Rowe.