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 collaboratorbe_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:
area_of_circle.should 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:
describe 27.5 do it { should be_within(0.5).of(27.9) } it { should be_within(0.5).of(28.0) } it { should be_within(0.5).of(27.1) } it { should be_within(0.5).of(27.0) } it { should_not be_within(0.5).of(28.1) } it { should_not be_within(0.5).of(26.9) } # deliberate failures it { should_not be_within(0.5).of(28) } it { should_not be_within(0.5).of(27) } it { should be_within(0.5).of(28.1) } it { should 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 about 7 years ago by myronmarston.