/
expectations.cr
309 lines (252 loc) · 7.37 KB
/
expectations.cr
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module Spec
# :nodoc:
struct EqualExpectation(T)
def initialize(@expected_value : T)
end
def match(actual_value)
actual_value == @expected_value
end
def failure_message(actual_value)
expected = @expected_value.inspect
got = actual_value.inspect
if expected == got
expected += " : #{@expected_value.class}"
got += " : #{actual_value.class}"
end
"Expected: #{expected}\n got: #{got}"
end
def negative_failure_message(actual_value)
"Expected: actual_value != #{@expected_value.inspect}\n got: #{actual_value.inspect}"
end
end
# :nodoc:
struct BeExpectation(T)
def initialize(@expected_value : T)
end
def match(actual_value)
actual_value.same? @expected_value
end
def failure_message(actual_value)
"Expected: #{@expected_value.inspect} (object_id: #{@expected_value.object_id})\n got: #{actual_value.inspect} (object_id: #{actual_value.object_id})"
end
def negative_failure_message(actual_value)
"Expected: value.same? #{@expected_value.inspect} (object_id: #{@expected_value.object_id})\n got: #{actual_value.inspect} (object_id: #{actual_value.object_id})"
end
end
# :nodoc:
struct BeTruthyExpectation
def match(actual_value)
!!actual_value
end
def failure_message(actual_value)
"Expected: #{actual_value.inspect} to be truthy"
end
def negative_failure_message(actual_value)
"Expected: #{actual_value.inspect} not to be truthy"
end
end
# :nodoc:
struct BeFalseyExpectation
def match(actual_value)
!actual_value
end
def failure_message(actual_value)
"Expected: #{actual_value.inspect} to be falsey"
end
def negative_failure_message(actual_value)
"Expected: #{actual_value.inspect} not to be falsey"
end
end
# :nodoc:
struct CloseExpectation(T, D)
def initialize(@expected_value : T, @delta : D)
end
def match(actual_value)
(actual_value - @expected_value).abs <= @delta
end
def failure_message(actual_value)
"Expected #{actual_value.inspect} to be within #{@delta} of #{@expected_value}"
end
def negative_failure_message(actual_value)
"Expected #{actual_value.inspect} not to be within #{@delta} of #{@expected_value}"
end
end
# :nodoc:
struct BeAExpectation(T)
def match(actual_value)
actual_value.is_a?(T)
end
def failure_message(actual_value)
"Expected #{actual_value.inspect} (#{actual_value.class}) to be a #{T}"
end
def negative_failure_message(actual_value)
"Expected #{actual_value.inspect} (#{actual_value.class}) not to be a #{T}"
end
end
# :nodoc:
struct Be(T)
def self.<(other)
Be.new(other, :"<")
end
def self.<=(other)
Be.new(other, :"<=")
end
def self.>(other)
Be.new(other, :">")
end
def self.>=(other)
Be.new(other, :">=")
end
def initialize(@expected_value : T, @op : Symbol)
end
def match(actual_value)
case @op
when :"<"
actual_value < @expected_value
when :"<="
actual_value <= @expected_value
when :">"
actual_value > @expected_value
when :">="
actual_value >= @expected_value
else
false
end
end
def failure_message(actual_value)
"Expected #{actual_value.inspect} to be #{@op} #{@expected_value}"
end
def negative_failure_message(actual_value)
"Expected #{actual_value.inspect} not to be #{@op} #{@expected_value}"
end
end
# :nodoc:
struct MatchExpectation(T)
def initialize(@expected_value : T)
end
def match(actual_value)
actual_value =~ @expected_value
end
def failure_message(actual_value)
"Expected: #{actual_value.inspect}\nto match: #{@expected_value.inspect}"
end
def negative_failure_message(actual_value)
"Expected: value #{actual_value.inspect}\n to not match: #{@expected_value.inspect}"
end
end
# :nodoc:
struct ContainExpectation(T)
def initialize(@expected_value : T)
end
def match(actual_value)
actual_value.includes?(@expected_value)
end
def failure_message(actual_value)
"Expected: #{actual_value.inspect}\nto include: #{@expected_value.inspect}"
end
def negative_failure_message(actual_value)
"Expected: value #{actual_value.inspect}\nto not include: #{@expected_value.inspect}"
end
end
module Expectations
def eq(value)
Spec::EqualExpectation.new value
end
def be(value)
Spec::BeExpectation.new value
end
def be_true
eq true
end
def be_false
eq false
end
def be_truthy
Spec::BeTruthyExpectation.new
end
def be_falsey
Spec::BeFalseyExpectation.new
end
def be_nil
eq nil
end
def be_close(expected, delta)
Spec::CloseExpectation.new(expected, delta)
end
def be
Spec::Be
end
def match(value)
Spec::MatchExpectation.new(value)
end
# Passes if actual includes *expected*. Works on collections and `String`.
def contain(expected)
Spec::ContainExpectation.new(expected)
end
macro be_a(type)
Spec::BeAExpectation({{type}}).new
end
macro expect_raises
expect_raises(Exception, nil) do
{{yield}}
end
end
macro expect_raises(klass)
expect_raises({{klass}}, nil) do
{{yield}}
end
end
macro expect_raises(klass, message, file = __FILE__, line = __LINE__)
%failed = false
begin
{{yield}}
%failed = true
fail "Expected {{klass.id}} but nothing was raised", {{file}}, {{line}}
rescue %ex : {{klass.id}}
# We usually bubble Spec::AssertaionFailed, unless this is the expected exception
if %ex.class == Spec::AssertionFailed && {{klass}} != Spec::AssertionFailed
raise %ex
end
%msg = {{message}}
%ex_to_s = %ex.to_s
case %msg
when Regex
unless (%ex_to_s =~ %msg)
backtrace = %ex.backtrace.map { |f| " # #{f}" }.join "\n"
fail "Expected {{klass.id}} with message matching #{ %msg.inspect }, got #<#{ %ex.class }: #{ %ex_to_s }> with backtrace:\n#{backtrace}", {{file}}, {{line}}
end
when String
unless %ex_to_s.includes?(%msg)
backtrace = %ex.backtrace.map { |f| " # #{f}" }.join "\n"
fail "Expected {{klass.id}} with #{ %msg.inspect }, got #<#{ %ex.class }: #{ %ex_to_s }> with backtrace:\n#{backtrace}", {{file}}, {{line}}
end
end
%ex
rescue %ex
if %failed
raise %ex
else
%ex_to_s = %ex.to_s
backtrace = %ex.backtrace.map { |f| " # #{f}" }.join "\n"
fail "Expected {{klass.id}}, got #<#{ %ex.class }: #{ %ex_to_s }> with backtrace:\n#{backtrace}", {{file}}, {{line}}
end
end
end
end
module ObjectExtensions
def should(expectation, file = __FILE__, line = __LINE__)
unless expectation.match self
fail(expectation.failure_message(self), file, line)
end
end
def should_not(expectation, file = __FILE__, line = __LINE__)
if expectation.match self
fail(expectation.negative_failure_message(self), file, line)
end
end
end
end
include Spec::Expectations
class Object
include Spec::ObjectExtensions
end