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Don't store initial value in matcher

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Michael Miller 2019-07-19 12:07:50 -06:00
parent 770100891c
commit 59cf939536
2 changed files with 29 additions and 23 deletions
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25
src/spectator/matchers/change_from_matcher.cr
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@ -2,31 +2,36 @@ require "./value_matcher"
module Spectator::Matchers
# Matcher that tests whether an expression changed from a specific value.
struct ChangeFromMatcher(ExpressionType, FromType) < ValueMatcher(ExpressionType)
struct ChangeFromMatcher(ExpressionType, FromType) < Matcher
# Textual representation of what the matcher expects.
# This shouldn't be used in the conditional logic,
# but for verbose output to help the end-user.
getter label : String
# Determines whether the matcher is satisfied with the partial given to it.
# `MatchData` is returned that contains information about the match.
def match(partial)
before = @expression.call # Retrieve the expression's initial value.
partial.actual # Invoke action that might change the expression's value.
after = @expression.call # Retrieve the expression's value.
if expected != @actual_before
after = @expression.call # Retrieve the expression's value again.
if @expected_before != before
# Initial value isn't what was expected.
InitialMatchData.new(expected, @actual_before, after, partial.label, label)
InitialMatchData.new(@expected_before, before, after, partial.label, label)
else
# Check if the expression's value changed.
matched = expected != after
ChangeMatchData.new(matched, expected, @actual_before, after, partial.label, label)
same = before == after
ChangeMatchData.new(!same, @expected_before, before, after, partial.label, label)
end
end
# Creates a new change matcher with a custom label.
def initialize(expression_label : String, expected_before : FromType, @actual_before : ExpressionType, &expression : -> ExpressionType)
super(expected_before, expression_label)
def initialize(@label, @expected_before : FromType, &expression : -> ExpressionType)
@expression = expression
end
# Creates a new change matcher.
def initialize(expected_before : FromType, @actual_before : ExpressionType, &expression : -> ExpressionType)
super(expected_before, expression.to_s)
def initialize(@expected_before : FromType, &expression : -> ExpressionType)
@label = expression.to_s
@expression = expression
end

23
src/spectator/matchers/change_matcher.cr
View file

@ -3,35 +3,36 @@ require "./value_matcher"
module Spectator::Matchers
# Matcher that tests whether an expression changed.
struct ChangeMatcher(ExpressionType) < ValueMatcher(ExpressionType)
# Determines whether the matcher is satisfied with the value given to it.
private def match?(after)
expected != after
end
struct ChangeMatcher(ExpressionType) < Matcher
# Textual representation of what the matcher expects.
# This shouldn't be used in the conditional logic,
# but for verbose output to help the end-user.
getter label : String
# Determines whether the matcher is satisfied with the partial given to it.
# `MatchData` is returned that contains information about the match.
def match(partial)
before = @expression.call # Retrieve the expression's initial value.
partial.actual # Invoke action that might change the expression's value.
after = @expression.call # Retrieve the expression's value.
MatchData.new(match?(after), expected, after, partial.label, label)
after = @expression.call # Retrieve the expression's value again.
same = before == after # Did the value change?
MatchData.new(!same, before, after, partial.label, label)
end
# Creates a new change matcher with a custom label.
def initialize(label : String, &expression : -> ExpressionType)
super(yield, label)
def initialize(@label, &expression : -> ExpressionType)
@expression = expression
end
# Creates a new change matcher.
def initialize(&expression : -> ExpressionType)
super(yield, expression.to_s)
@label = expression.to_s
@expression = expression
end
# Specifies what the initial value of the expression must be.
def from(value : T) forall T
ChangeFromMatcher.new(label, value, expected, &@expression)
ChangeFromMatcher.new(label, value, &@expression)
end
# Match data specific to this matcher.