Add ReferenceMatcher type

This commit is contained in:
Michael Miller 2019-05-08 16:59:36 -06:00
parent 7168b26218
commit f53bc26c28
2 changed files with 199 additions and 0 deletions

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require "../spec_helper"
describe Spectator::Matchers::ReferenceMatcher do
describe "#match" do
context "returned MatchData" do
describe "#matched?" do
context "with the same instance" do
it "is true" do
# Box is used because it is a reference type and doesn't override the == method.
ref = Box.new([] of Int32)
partial = new_partial(ref)
matcher = Spectator::Matchers::ReferenceMatcher.new(ref)
match_data = matcher.match(partial)
match_data.matched?.should be_true
end
end
context "with different instances" do
context "with same contents" do
it "is false" do
array1 = [1, 2, 3]
array2 = [1, 2, 3]
partial = new_partial(array1)
matcher = Spectator::Matchers::ReferenceMatcher.new(array2)
match_data = matcher.match(partial)
match_data.matched?.should be_false
end
end
context "with a duplicated instance" do
it "is false" do
array1 = [1, 2, 3]
array2 = array1.dup
partial = new_partial(array1)
matcher = Spectator::Matchers::ReferenceMatcher.new(array2)
match_data = matcher.match(partial)
match_data.matched?.should be_false
end
end
context "with the same type" do
it "is false" do
obj1 = "foo"
obj2 = "bar"
partial = new_partial(obj1)
matcher = Spectator::Matchers::ReferenceMatcher.new(obj2)
match_data = matcher.match(partial)
match_data.matched?.should be_false
end
end
context "with a different type" do
it "is false" do
obj1 = "foobar"
obj2 = [1, 2, 3]
partial = new_partial(obj1)
matcher = Spectator::Matchers::ReferenceMatcher.new(obj2)
match_data = matcher.match(partial)
match_data.matched?.should be_false
end
end
end
end
describe "#values" do
context "expected" do
it "is the expected value" do
actual = "foobar"
expected = /foo/
partial = new_partial(actual)
matcher = Spectator::Matchers::ReferenceMatcher.new(expected)
match_data = matcher.match(partial)
match_data_value_sans_prefix(match_data.values, :expected)[:value].should eq(expected)
end
end
context "actual" do
it "is the actual value" do
actual = "foobar"
expected = /foo/
partial = new_partial(actual)
matcher = Spectator::Matchers::ReferenceMatcher.new(expected)
match_data = matcher.match(partial)
match_data_value_sans_prefix(match_data.values, :actual)[:value].should eq(actual)
end
end
end
describe "#message" do
it "contains the actual label" do
value = "foobar"
label = "everything"
partial = new_partial(value, label)
matcher = Spectator::Matchers::ReferenceMatcher.new(value)
match_data = matcher.match(partial)
match_data.message.should contain(label)
end
it "contains the expected label" do
value = "foobar"
label = "everything"
partial = new_partial(value)
matcher = Spectator::Matchers::ReferenceMatcher.new(value, label)
match_data = matcher.match(partial)
match_data.message.should contain(label)
end
context "when expected label is omitted" do
it "contains stringified form of expected value" do
obj1 = "foo"
obj2 = "bar"
partial = new_partial(obj1)
matcher = Spectator::Matchers::ReferenceMatcher.new(obj2)
match_data = matcher.match(partial)
match_data.message.should contain(obj2.to_s)
end
end
end
describe "#negated_message" do
it "contains the actual label" do
value = "foobar"
label = "everything"
partial = new_partial(value, label)
matcher = Spectator::Matchers::ReferenceMatcher.new(value)
match_data = matcher.match(partial)
match_data.negated_message.should contain(label)
end
it "contains the expected label" do
value = "foobar"
label = "everything"
partial = new_partial(value)
matcher = Spectator::Matchers::ReferenceMatcher.new(value, label)
match_data = matcher.match(partial)
match_data.negated_message.should contain(label)
end
context "when expected label is omitted" do
it "contains stringified form of expected value" do
obj1 = "foo"
obj2 = "bar"
partial = new_partial(obj1)
matcher = Spectator::Matchers::ReferenceMatcher.new(obj2)
match_data = matcher.match(partial)
match_data.negated_message.should contain(obj2.to_s)
end
end
end
end
end
end

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require "./value_matcher"
module Spectator::Matchers
# Matcher that tests whether two references are the same.
# The values are compared with the `Reference#same?` method.
struct ReferenceMatcher(ExpectedType) < ValueMatcher(ExpectedType)
# Determines whether the matcher is satisfied with the value given to it.
private def match?(actual)
actual.same?(expected)
end
# Determines whether the matcher is satisfied with the partial given to it.
# `MatchData` is returned that contains information about the match.
def match(partial)
values = ExpectedActual.new(partial, self)
MatchData.new(match?(values.actual), values)
end
# Match data specific to this matcher.
private struct MatchData(ExpectedType, ActualType) < MatchData
# Creates the match data.
def initialize(matched, @values : ExpectedActual(ExpectedType, ActualType))
super(matched)
end
# Information about the match.
def named_tuple
{
expected: NegatableMatchDataValue.new(@values.expected),
actual: @values.actual,
}
end
# Describes the condition that satisfies the matcher.
# This is informational and displayed to the end-user.
def message
"#{@values.actual_label} is #{@values.expected_label}"
end
# Describes the condition that won't satsify the matcher.
# This is informational and displayed to the end-user.
def negated_message
"#{@values.actual_label} is not #{@values.expected_label}"
end
end
end
end