256 lines
8.3 KiB
Ruby
256 lines
8.3 KiB
Ruby
# frozen_string_literal: true
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require "cases/helper"
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module ActiveModel
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class AttributeTest < ActiveModel::TestCase
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setup do
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@type = Minitest::Mock.new
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end
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teardown do
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assert @type.verify
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end
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test "from_database + read type casts from database" do
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@type.expect(:deserialize, "type cast from database", ["a value"])
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attribute = Attribute.from_database(nil, "a value", @type)
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type_cast_value = attribute.value
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assert_equal "type cast from database", type_cast_value
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end
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test "from_user + read type casts from user" do
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@type.expect(:cast, "type cast from user", ["a value"])
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attribute = Attribute.from_user(nil, "a value", @type)
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type_cast_value = attribute.value
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assert_equal "type cast from user", type_cast_value
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end
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test "reading memoizes the value" do
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@type.expect(:deserialize, "from the database", ["whatever"])
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attribute = Attribute.from_database(nil, "whatever", @type)
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type_cast_value = attribute.value
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second_read = attribute.value
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assert_equal "from the database", type_cast_value
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assert_same type_cast_value, second_read
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end
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test "reading memoizes falsy values" do
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@type.expect(:deserialize, false, ["whatever"])
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attribute = Attribute.from_database(nil, "whatever", @type)
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attribute.value
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attribute.value
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end
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test "read_before_typecast returns the given value" do
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attribute = Attribute.from_database(nil, "raw value", @type)
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raw_value = attribute.value_before_type_cast
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assert_equal "raw value", raw_value
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end
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test "from_database + read_for_database type casts to and from database" do
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@type.expect(:deserialize, "read from database", ["whatever"])
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@type.expect(:serialize, "ready for database", ["read from database"])
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attribute = Attribute.from_database(nil, "whatever", @type)
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serialize = attribute.value_for_database
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assert_equal "ready for database", serialize
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end
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test "from_user + read_for_database type casts from the user to the database" do
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@type.expect(:cast, "read from user", ["whatever"])
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@type.expect(:serialize, "ready for database", ["read from user"])
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attribute = Attribute.from_user(nil, "whatever", @type)
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serialize = attribute.value_for_database
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assert_equal "ready for database", serialize
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end
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test "duping dups the value" do
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@type.expect(:deserialize, +"type cast", ["a value"])
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attribute = Attribute.from_database(nil, "a value", @type)
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value_from_orig = attribute.value
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value_from_clone = attribute.dup.value
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value_from_orig << " foo"
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assert_equal "type cast foo", value_from_orig
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assert_equal "type cast", value_from_clone
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end
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test "duping does not dup the value if it is not dupable" do
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@type.expect(:deserialize, false, ["a value"])
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attribute = Attribute.from_database(nil, "a value", @type)
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assert_same attribute.value, attribute.dup.value
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end
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test "duping does not eagerly type cast if we have not yet type cast" do
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attribute = Attribute.from_database(nil, "a value", @type)
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attribute.dup
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end
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class MyType
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def cast(value)
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value + " from user"
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end
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def deserialize(value)
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value + " from database"
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end
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def assert_valid_value(*)
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end
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end
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test "with_value_from_user returns a new attribute with the value from the user" do
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old = Attribute.from_database(nil, "old", MyType.new)
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new = old.with_value_from_user("new")
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assert_equal "old from database", old.value
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assert_equal "new from user", new.value
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end
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test "with_value_from_database returns a new attribute with the value from the database" do
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old = Attribute.from_user(nil, "old", MyType.new)
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new = old.with_value_from_database("new")
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assert_equal "old from user", old.value
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assert_equal "new from database", new.value
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end
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test "uninitialized attributes yield their name if a block is given to value" do
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block = proc { |name| name.to_s + "!" }
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foo = Attribute.uninitialized(:foo, nil)
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bar = Attribute.uninitialized(:bar, nil)
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assert_equal "foo!", foo.value(&block)
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assert_equal "bar!", bar.value(&block)
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end
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test "uninitialized attributes have no value" do
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assert_nil Attribute.uninitialized(:foo, nil).value
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end
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test "attributes equal other attributes with the same constructor arguments" do
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first = Attribute.from_database(:foo, 1, Type::Integer.new)
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second = Attribute.from_database(:foo, 1, Type::Integer.new)
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assert_equal first, second
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end
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test "attributes do not equal attributes with different names" do
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first = Attribute.from_database(:foo, 1, Type::Integer.new)
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second = Attribute.from_database(:bar, 1, Type::Integer.new)
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assert_not_equal first, second
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end
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test "attributes do not equal attributes with different types" do
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first = Attribute.from_database(:foo, 1, Type::Integer.new)
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second = Attribute.from_database(:foo, 1, Type::Float.new)
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assert_not_equal first, second
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end
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test "attributes do not equal attributes with different values" do
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first = Attribute.from_database(:foo, 1, Type::Integer.new)
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second = Attribute.from_database(:foo, 2, Type::Integer.new)
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assert_not_equal first, second
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end
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test "attributes do not equal attributes of other classes" do
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first = Attribute.from_database(:foo, 1, Type::Integer.new)
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second = Attribute.from_user(:foo, 1, Type::Integer.new)
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assert_not_equal first, second
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end
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test "an attribute has not been read by default" do
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attribute = Attribute.from_database(:foo, 1, Type::Value.new)
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assert_not_predicate attribute, :has_been_read?
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end
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test "an attribute has been read when its value is calculated" do
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attribute = Attribute.from_database(:foo, 1, Type::Value.new)
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attribute.value
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assert_predicate attribute, :has_been_read?
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end
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test "an attribute is not changed if it hasn't been assigned or mutated" do
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attribute = Attribute.from_database(:foo, 1, Type::Value.new)
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assert_not_predicate attribute, :changed?
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end
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test "an attribute is changed if it's been assigned a new value" do
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attribute = Attribute.from_database(:foo, 1, Type::Value.new)
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changed = attribute.with_value_from_user(2)
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assert_predicate changed, :changed?
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end
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test "an attribute is not changed if it's assigned the same value" do
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attribute = Attribute.from_database(:foo, 1, Type::Value.new)
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unchanged = attribute.with_value_from_user(1)
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assert_not_predicate unchanged, :changed?
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end
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test "an attribute cannot be mutated if it has not been read,
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and skips expensive calculations" do
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type_which_raises_from_all_methods = Object.new
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attribute = Attribute.from_database(:foo, "bar", type_which_raises_from_all_methods)
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assert_not_predicate attribute, :changed_in_place?
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end
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test "an attribute is changed if it has been mutated" do
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attribute = Attribute.from_database(:foo, "bar", Type::String.new)
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attribute.value << "!"
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assert_predicate attribute, :changed_in_place?
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assert_predicate attribute, :changed?
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end
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test "an attribute can forget its changes" do
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attribute = Attribute.from_database(:foo, "bar", Type::String.new)
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changed = attribute.with_value_from_user("foo")
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forgotten = changed.forgetting_assignment
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assert changed.changed? # sanity check
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assert_not_predicate forgotten, :changed?
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end
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test "with_value_from_user validates the value" do
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type = Type::Value.new
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type.define_singleton_method(:assert_valid_value) do |value|
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if value == 1
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raise ArgumentError
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end
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end
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attribute = Attribute.from_database(:foo, 1, type)
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assert_equal 1, attribute.value
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assert_equal 2, attribute.with_value_from_user(2).value
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assert_raises ArgumentError do
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attribute.with_value_from_user(1)
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end
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end
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test "with_type preserves mutations" do
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attribute = Attribute.from_database(:foo, +"", Type::Value.new)
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attribute.value << "1"
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assert_equal 1, attribute.with_type(Type::Integer.new).value
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end
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end
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end
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