Add less-than matcher

This commit is contained in:
Michael Miller 2019-01-23 20:31:28 -07:00
parent f7d5c27e65
commit 4ccc27321e
2 changed files with 27 additions and 2 deletions

View file

@ -10,8 +10,8 @@ module Spectator::Matchers
# ``` # ```
# expect(0).to be < 1 # expect(0).to be < 1
# ``` # ```
def <(other : ExpectedType) forall ExpectedType def <(expected : ExpectedType) forall ExpectedType
raise NotImplementedError.new("be <") LessThanMatcher.new(expected)
end end
# Creates a matcher that checks if a value is less than or equal to an expected value. # Creates a matcher that checks if a value is less than or equal to an expected value.

View file

@ -0,0 +1,25 @@
require "./value_matcher"
module Spectator::Matchers
# Matcher that tests whether one value is less than another.
# The values are compared with the `<` operator.
struct LessThanMatcher(ExpectedType) < ValueMatcher(ExpectedType)
# Determines whether the matcher is satisfied with the value given to it.
# True is returned if the match was successful, false otherwise.
def match?(partial : Expectations::ValueExpectationPartial(ActualType)) : Bool forall ActualType
partial.actual < expected
end
# Describes the condition that satisfies the matcher.
# This is informational and displayed to the end-user.
def message(partial : Expectations::ValueExpectationPartial(ActualType)) : String forall ActualType
"Expected #{partial.label} to be less than #{label} (using <)"
end
# Describes the condition that won't satsify the matcher.
# This is informational and displayed to the end-user.
def negated_message(partial : Expectations::ValueExpectationPartial(ActualType)) : String forall ActualType
"Expected #{partial.label} to not be less than #{label} (using <)"
end
end
end