/
test_case_test.rb
606 lines (501 loc) · 16.2 KB
/
test_case_test.rb
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# frozen_string_literal: true
require_relative "abstract_unit"
class AssertionsTest < ActiveSupport::TestCase
def setup
@object = Class.new do
attr_accessor :num
def increment
self.num += 1
end
def decrement
self.num -= 1
end
end.new
@object.num = 0
end
def test_assert_not
assert_equal true, assert_not(nil)
assert_equal true, assert_not(false)
e = assert_raises(Minitest::Assertion) { assert_not true }
assert_equal "Expected true to be nil or false", e.message
e = assert_raises(Minitest::Assertion) { assert_not true, "custom" }
assert_equal "custom", e.message
end
def test_assert_raises_with_match_pass
assert_raises(ArgumentError, match: /incorrect/i) do
raise ArgumentError, "Incorrect argument"
end
end
def test_assert_raises_with_match_fail
assert_raises(Minitest::Assertion, match: "Expected /incorrect/i to match \"Wrong argument\".") do
assert_raises(ArgumentError, match: /incorrect/i) do
raise ArgumentError, "Wrong argument"
end
end
end
def test_assert_no_difference_pass
assert_no_difference "@object.num" do
# ...
end
end
def test_assert_no_difference_fail
error = assert_raises(Minitest::Assertion) do
assert_no_difference "@object.num" do
@object.increment
end
end
assert_equal "\"@object.num\" didn't change by 0, but by 1.\nExpected: 0\n Actual: 1", error.message
end
def test_assert_no_difference_with_message_fail
error = assert_raises(Minitest::Assertion) do
assert_no_difference "@object.num", "Object Changed" do
@object.increment
end
end
assert_equal "Object Changed.\n\"@object.num\" didn't change by 0, but by 1.\nExpected: 0\n Actual: 1", error.message
end
def test_assert_no_difference_with_multiple_expressions_pass
another_object = @object.dup
assert_no_difference ["@object.num", -> { another_object.num }] do
# ...
end
end
def test_assert_no_difference_with_multiple_expressions_fail
another_object = @object.dup
assert_raises(Minitest::Assertion) do
assert_no_difference ["@object.num", -> { another_object.num }], "Another Object Changed" do
another_object.increment
end
end
end
def test_assert_difference
assert_difference "@object.num", +1 do
@object.increment
end
end
def test_assert_difference_retval
incremented = assert_difference "@object.num", +1 do
@object.increment
end
assert_equal 1, incremented
end
def test_assert_difference_with_implicit_difference
assert_difference "@object.num" do
@object.increment
end
end
def test_arbitrary_expression
assert_difference "@object.num + 1", +2 do
@object.increment
@object.increment
end
end
def test_negative_differences
assert_difference "@object.num", -1 do
@object.decrement
end
end
def test_expression_is_evaluated_in_the_appropriate_scope
silence_warnings do
local_scope = "foo"
_ = local_scope # to suppress unused variable warning
assert_difference("local_scope; @object.num") { @object.increment }
end
end
def test_array_of_expressions
assert_difference [ "@object.num", "@object.num + 1" ], +1 do
@object.increment
end
end
def test_array_of_expressions_identify_failure
assert_raises(Minitest::Assertion) do
assert_difference ["@object.num", "1 + 1"] do
@object.increment
end
end
end
def test_array_of_expressions_identify_failure_when_message_provided
assert_raises(Minitest::Assertion) do
assert_difference ["@object.num", "1 + 1"], 1, "something went wrong" do
@object.increment
end
end
end
def test_hash_of_expressions
assert_difference "@object.num" => 1, "@object.num + 1" => 1 do
@object.increment
end
end
def test_hash_of_expressions_with_message
error = assert_raises Minitest::Assertion do
assert_difference({ "@object.num" => 0 }, "Object Changed") do
@object.increment
end
end
assert_equal "Object Changed.\n\"@object.num\" didn't change by 0, but by 1.\nExpected: 0\n Actual: 1", error.message
end
def test_assert_difference_message_includes_change
error = assert_raises Minitest::Assertion do
assert_difference "@object.num", +5 do
@object.increment
@object.increment
end
end
assert_equal "\"@object.num\" didn't change by 5, but by 2.\nExpected: 5\n Actual: 2", error.message
end
def test_hash_of_lambda_expressions
assert_difference -> { @object.num } => 1, -> { @object.num + 1 } => 1 do
@object.increment
end
end
def test_hash_of_expressions_identify_failure
assert_raises(Minitest::Assertion) do
assert_difference "@object.num" => 1, "1 + 1" => 1 do
@object.increment
end
end
end
def test_assert_changes_pass
assert_changes "@object.num" do
@object.increment
end
end
def test_assert_changes_pass_with_lambda
assert_changes -> { @object.num } do
@object.increment
end
end
def test_assert_changes_with_from_option
assert_changes "@object.num", from: 0 do
@object.increment
end
end
def test_assert_changes_with_from_option_with_wrong_value
assert_raises Minitest::Assertion do
assert_changes "@object.num", from: -1 do
@object.increment
end
end
end
def test_assert_changes_with_from_option_with_nil
error = assert_raises Minitest::Assertion do
assert_changes "@object.num", from: nil do
@object.increment
end
end
assert_equal "Expected change from nil, got 0", error.message
end
def test_assert_changes_with_to_option
assert_changes "@object.num", to: 1 do
@object.increment
end
end
def test_assert_changes_with_to_option_but_no_change_has_special_message
error = assert_raises Minitest::Assertion do
assert_changes "@object.num", to: 0 do
# no changes
end
end
assert_equal "\"@object.num\" didn't change. It was already 0.\nExpected 0 to not be equal to 0.", error.message
end
def test_assert_changes_with_wrong_to_option
assert_raises Minitest::Assertion do
assert_changes "@object.num", to: 2 do
@object.increment
end
end
end
def test_assert_changes_with_from_option_and_to_option
assert_changes "@object.num", from: 0, to: 1 do
@object.increment
end
end
def test_assert_changes_with_from_and_to_options_and_wrong_to_value
assert_raises Minitest::Assertion do
assert_changes "@object.num", from: 0, to: 2 do
@object.increment
end
end
end
def test_assert_changes_works_with_any_object
# Silences: instance variable @new_object not initialized.
retval = silence_warnings do
assert_changes :@new_object, from: nil, to: 42 do
@new_object = 42
end
end
assert_equal 42, retval
end
def test_assert_changes_works_with_nil
oldval = @object
retval = assert_changes :@object, from: oldval, to: nil do
@object = nil
end
assert_nil retval
end
def test_assert_changes_with_to_and_case_operator
token = nil
assert_changes -> { token }, to: /\w{32}/ do
token = SecureRandom.hex
end
end
def test_assert_changes_with_to_and_from_and_case_operator
token = SecureRandom.hex
assert_changes -> { token }, from: /\w{32}/, to: /\w{32}/ do
token = SecureRandom.hex
end
end
def test_assert_changes_with_message
error = assert_raises Minitest::Assertion do
assert_changes "@object.num", "@object.num should be 1", to: 1 do
@object.decrement
end
end
assert_equal "@object.num should be 1.\nExpected change to 1, got -1\n", error.message
end
def test_assert_no_changes_pass
assert_no_changes "@object.num" do
# ...
end
end
def test_assert_no_changes_with_from_option
assert_no_changes "@object.num", from: 0 do
# ...
end
end
def test_assert_no_changes_with_from_option_with_wrong_value
assert_raises Minitest::Assertion do
assert_no_changes "@object.num", from: -1 do
# ...
end
end
end
def test_assert_no_changes_with_from_option_with_nil
error = assert_raises Minitest::Assertion do
assert_no_changes "@object.num", from: nil do
@object.increment
end
end
assert_equal "Expected initial value of nil, got 0", error.message
end
def test_assert_no_changes_with_from_and_case_operator
token = SecureRandom.hex
assert_no_changes -> { token }, from: /\w{32}/ do
# ...
end
end
def test_assert_no_changes_with_message
error = assert_raises Minitest::Assertion do
assert_no_changes "@object.num", "@object.num should not change" do
@object.increment
end
end
assert_equal "@object.num should not change.\n\"@object.num\" changed.\nExpected: 0\n Actual: 1", error.message
end
def test_assert_no_changes_with_long_string_wont_output_everything
lines = "HEY\n" * 12
error = assert_raises Minitest::Assertion do
assert_no_changes "lines" do
lines += "HEY ALSO\n"
end
end
assert_match <<~output, error.message
"lines" changed.
--- expected
+++ actual
@@ -10,4 +10,5 @@
HEY
HEY
HEY
+HEY ALSO
"
output
end
end
class ExceptionsInsideAssertionsTest < ActiveSupport::TestCase
def before_setup
require "stringio"
@out = StringIO.new
self.tagged_logger = ActiveSupport::TaggedLogging.new(Logger.new(@out))
super
end
def test_warning_is_logged_if_caught_internally
run_test_that_should_pass_and_log_a_warning
expected = <<~MSG
ExceptionsInsideAssertionsTest - test_warning_is_logged_if_caught_internally: ArgumentError raised.
If you expected this exception, use `assert_raises` as near to the code that raises as possible.
Other block based assertions (e.g. `assert_no_changes`) can be used, as long as `assert_raises` is inside their block.
MSG
assert_includes @out.string, expected
end
def test_warning_is_not_logged_if_caught_correctly_by_user
run_test_that_should_pass_and_not_log_a_warning
assert_not @out.string.include?("assert_nothing_raised")
end
def test_warning_is_not_logged_if_assertions_are_nested_correctly
error = assert_raises(Minitest::Assertion) do
run_test_that_should_fail_but_not_log_a_warning
end
assert_not @out.string.include?("assert_nothing_raised")
assert error.message.include?("(lambda)> changed")
end
def test_fails_and_warning_is_logged_if_wrong_error_caught
error = assert_raises(Minitest::Assertion) do
run_test_that_should_fail_confusingly
end
expected = <<~MSG
ExceptionsInsideAssertionsTest - test_fails_and_warning_is_logged_if_wrong_error_caught: ArgumentError raised.
If you expected this exception, use `assert_raises` as near to the code that raises as possible.
Other block based assertions (e.g. `assert_no_changes`) can be used, as long as `assert_raises` is inside their block.
MSG
assert_includes @out.string, expected
assert_includes error.message, "ArgumentError: ArgumentError"
assert_includes error.message, "run_test_that_should_fail_confusingly"
end
private
def run_test_that_should_pass_and_log_a_warning
assert_raises(Minitest::UnexpectedError) do # this assertion passes, but it's unlikely to be how anyone writes a test
assert_no_changes -> { 1 } do # this assertion doesn't run. the error below is caught and the warning logged.
raise ArgumentError.new
end
end
end
def run_test_that_should_fail_confusingly
assert_raises(ArgumentError) do # this assertion fails (confusingly) because it catches a Minitest::UnexpectedError.
assert_no_changes -> { 1 } do # this assertion doesn't run. the error below is caught and the warning logged.
raise ArgumentError.new
end
end
end
def run_test_that_should_pass_and_not_log_a_warning
assert_no_changes -> { 1 } do # this assertion passes
assert_raises(ArgumentError) do # this assertion passes
raise ArgumentError.new
end
end
end
def run_test_that_should_fail_but_not_log_a_warning
assert_no_changes -> { rand } do # this assertion fails
assert_raises(ArgumentError) do # this assertion passes
raise ArgumentError.new
end
end
end
end
# Setup and teardown callbacks.
class SetupAndTeardownTest < ActiveSupport::TestCase
setup :reset_callback_record, :foo
teardown :foo, :sentinel
def test_inherited_setup_callbacks
assert_equal [:reset_callback_record, :foo], self.class._setup_callbacks.map(&:filter)
assert_equal [:foo], @called_back
assert_equal [:foo, :sentinel], self.class._teardown_callbacks.map(&:filter)
end
def setup
end
def teardown
end
private
def reset_callback_record
@called_back = []
end
def foo
@called_back << :foo
end
def sentinel
assert_equal [:foo], @called_back
end
end
class SubclassSetupAndTeardownTest < SetupAndTeardownTest
setup :bar
teardown :bar
def test_inherited_setup_callbacks
assert_equal [:reset_callback_record, :foo, :bar], self.class._setup_callbacks.map(&:filter)
assert_equal [:foo, :bar], @called_back
assert_equal [:foo, :sentinel, :bar], self.class._teardown_callbacks.map(&:filter)
end
private
def bar
@called_back << :bar
end
def sentinel
assert_equal [:foo, :bar, :bar], @called_back
end
end
class TestCaseTaggedLoggingTest < ActiveSupport::TestCase
def before_setup
require "stringio"
@out = StringIO.new
self.tagged_logger = ActiveSupport::TaggedLogging.new(Logger.new(@out))
super
end
def test_logs_tagged_with_current_test_case
assert_match "#{self.class}: #{name}\n", @out.string
end
end
class TestOrderTest < ActiveSupport::TestCase
def setup
@original_test_order = ActiveSupport::TestCase.test_order
end
def teardown
ActiveSupport::TestCase.test_order = @original_test_order
end
def test_defaults_to_random
ActiveSupport::TestCase.test_order = nil
assert_equal :random, ActiveSupport::TestCase.test_order
assert_equal :random, ActiveSupport.test_order
end
def test_test_order_is_global
ActiveSupport::TestCase.test_order = :sorted
assert_equal :sorted, ActiveSupport.test_order
assert_equal :sorted, ActiveSupport::TestCase.test_order
assert_equal :sorted, self.class.test_order
assert_equal :sorted, Class.new(ActiveSupport::TestCase).test_order
ActiveSupport.test_order = :random
assert_equal :random, ActiveSupport.test_order
assert_equal :random, ActiveSupport::TestCase.test_order
assert_equal :random, self.class.test_order
assert_equal :random, Class.new(ActiveSupport::TestCase).test_order
end
end
class ConstStubbable
CONSTANT = 1
end
class SubclassOfConstStubbable < ConstStubbable
end
class TestConstStubbing < ActiveSupport::TestCase
test "stubbing a constant temporarily replaces it with a new value" do
stub_const(ConstStubbable, :CONSTANT, 2) do
assert_equal 2, ConstStubbable::CONSTANT
end
assert_equal 1, ConstStubbable::CONSTANT
end
test "stubbed constant still reset even if exception is raised" do
assert_raises(RuntimeError) do
stub_const(ConstStubbable, :CONSTANT, 2) do
assert_equal 2, ConstStubbable::CONSTANT
raise "Exception"
end
end
assert_equal 1, ConstStubbable::CONSTANT
end
test "stubbing a constant that does not exist in the receiver raises NameError" do
assert_raises(NameError) do
stub_const(ConstStubbable, :NOT_A_CONSTANT, 1) { }
end
assert_raises(NameError) do
stub_const(SubclassOfConstStubbable, :CONSTANT, 1) { }
end
end
test "stubbing a constant that does not exist can be done with `exists: false`" do
stub_const(ConstStubbable, :NOT_A_CONSTANT, 1, exists: false) do
assert_equal 1, ConstStubbable::NOT_A_CONSTANT
end
assert_raises(NameError) do
ConstStubbable::NOT_A_CONSTANT
end
assert_raises(NameError) do
stub_const(Object, :ConstStubbable, 1, exists: false)
end
end
end