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More about adding a collaboratorComparison matchers
RSpec provides a number of matchers that are based on Ruby's built-in operators. These
can be used for generalized comparison of values. E.g.
expect(9).to be > 6
expect(3).to be <= 3
expect(1).to be < 6
expect('a').to be < 'b'
- Scenarios
-
- numeric operator matchers
-
- Given
-
a file named "numeric_operator_matchers_spec.rb" with:
RSpec.describe 18 do it { is_expected.to be < 20 } it { is_expected.to be > 15 } it { is_expected.to be <= 19 } it { is_expected.to be >= 17 } # deliberate failures it { is_expected.to be < 15 } it { is_expected.to be > 20 } it { is_expected.to be <= 17 } it { is_expected.to be >= 19 } it { is_expected.to be < 'a' } end RSpec.describe 'a' do it { is_expected.to be < 'b' } # deliberate failures it { is_expected.to be < 18 } end
- When
-
I run
rspec numeric_operator_matchers_spec.rb
- Then
- the output should contain "11 examples, 6 failures"
- And
-
the output should contain:
Failure/Error: it { is_expected.to be < 15 } expected: < 15 got: 18
- And
-
the output should contain:
Failure/Error: it { is_expected.to be > 20 } expected: > 20 got: 18
- And
-
the output should contain:
Failure/Error: it { is_expected.to be <= 17 } expected: <= 17 got: 18
- And
-
the output should contain:
Failure/Error: it { is_expected.to be >= 19 } expected: >= 19 got: 18
- And
-
the output should contain:
Failure/Error: it { is_expected.to be < 'a' } expected: < "a" got: 18
- And
-
the output should contain:
Failure/Error: it { is_expected.to be < 18 } expected: < 18 got: "a"
- string operator matchers
-
- Given
-
a file named "string_operator_matchers_spec.rb" with:
RSpec.describe "Strawberry" do it { is_expected.to be < "Tomato" } it { is_expected.to be > "Apple" } it { is_expected.to be <= "Turnip" } it { is_expected.to be >= "Banana" } # deliberate failures it { is_expected.to be < "Cranberry" } it { is_expected.to be > "Zuchini" } it { is_expected.to be <= "Potato" } it { is_expected.to be >= "Tomato" } end
- When
-
I run
rspec string_operator_matchers_spec.rb
- Then
- the output should contain "8 examples, 4 failures"
- And
-
the output should contain:
Failure/Error: it { is_expected.to be < "Cranberry" } expected: < "Cranberry" got: "Strawberry"
- And
-
the output should contain:
Failure/Error: it { is_expected.to be > "Zuchini" } expected: > "Zuchini" got: "Strawberry"
- And
-
the output should contain:
Failure/Error: it { is_expected.to be <= "Potato" } expected: <= "Potato" got: "Strawberry"
- And
-
the output should contain:
Failure/Error: it { is_expected.to be >= "Tomato" } expected: >= "Tomato" got: "Strawberry"
Last published about 5 years ago by myronmarston.