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Diffstat (limited to 'activemodel/test/cases/attribute_test.rb')
| -rw-r--r-- | activemodel/test/cases/attribute_test.rb | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/activemodel/test/cases/attribute_test.rb b/activemodel/test/cases/attribute_test.rb new file mode 100644 index 0000000000..20c02e689c --- /dev/null +++ b/activemodel/test/cases/attribute_test.rb @@ -0,0 +1,255 @@ +# frozen_string_literal: true + +require "cases/helper" + +module ActiveModel + class AttributeTest < ActiveModel::TestCase + setup do + @type = Minitest::Mock.new + end + + teardown do + assert @type.verify + end + + test "from_database + read type casts from database" do + @type.expect(:deserialize, "type cast from database", ["a value"]) + attribute = Attribute.from_database(nil, "a value", @type) + + type_cast_value = attribute.value + + assert_equal "type cast from database", type_cast_value + end + + test "from_user + read type casts from user" do + @type.expect(:cast, "type cast from user", ["a value"]) + attribute = Attribute.from_user(nil, "a value", @type) + + type_cast_value = attribute.value + + assert_equal "type cast from user", type_cast_value + end + + test "reading memoizes the value" do + @type.expect(:deserialize, "from the database", ["whatever"]) + attribute = Attribute.from_database(nil, "whatever", @type) + + type_cast_value = attribute.value + second_read = attribute.value + + assert_equal "from the database", type_cast_value + assert_same type_cast_value, second_read + end + + test "reading memoizes falsy values" do + @type.expect(:deserialize, false, ["whatever"]) + attribute = Attribute.from_database(nil, "whatever", @type) + + attribute.value + attribute.value + end + + test "read_before_typecast returns the given value" do + attribute = Attribute.from_database(nil, "raw value", @type) + + raw_value = attribute.value_before_type_cast + + assert_equal "raw value", raw_value + end + + test "from_database + read_for_database type casts to and from database" do + @type.expect(:deserialize, "read from database", ["whatever"]) + @type.expect(:serialize, "ready for database", ["read from database"]) + attribute = Attribute.from_database(nil, "whatever", @type) + + serialize = attribute.value_for_database + + assert_equal "ready for database", serialize + end + + test "from_user + read_for_database type casts from the user to the database" do + @type.expect(:cast, "read from user", ["whatever"]) + @type.expect(:serialize, "ready for database", ["read from user"]) + attribute = Attribute.from_user(nil, "whatever", @type) + + serialize = attribute.value_for_database + + assert_equal "ready for database", serialize + end + + test "duping dups the value" do + @type.expect(:deserialize, +"type cast", ["a value"]) + attribute = Attribute.from_database(nil, "a value", @type) + + value_from_orig = attribute.value + value_from_clone = attribute.dup.value + value_from_orig << " foo" + + assert_equal "type cast foo", value_from_orig + assert_equal "type cast", value_from_clone + end + + test "duping does not dup the value if it is not dupable" do + @type.expect(:deserialize, false, ["a value"]) + attribute = Attribute.from_database(nil, "a value", @type) + + assert_same attribute.value, attribute.dup.value + end + + test "duping does not eagerly type cast if we have not yet type cast" do + attribute = Attribute.from_database(nil, "a value", @type) + attribute.dup + end + + class MyType + def cast(value) + value + " from user" + end + + def deserialize(value) + value + " from database" + end + + def assert_valid_value(*) + end + end + + test "with_value_from_user returns a new attribute with the value from the user" do + old = Attribute.from_database(nil, "old", MyType.new) + new = old.with_value_from_user("new") + + assert_equal "old from database", old.value + assert_equal "new from user", new.value + end + + test "with_value_from_database returns a new attribute with the value from the database" do + old = Attribute.from_user(nil, "old", MyType.new) + new = old.with_value_from_database("new") + + assert_equal "old from user", old.value + assert_equal "new from database", new.value + end + + test "uninitialized attributes yield their name if a block is given to value" do + block = proc { |name| name.to_s + "!" } + foo = Attribute.uninitialized(:foo, nil) + bar = Attribute.uninitialized(:bar, nil) + + assert_equal "foo!", foo.value(&block) + assert_equal "bar!", bar.value(&block) + end + + test "uninitialized attributes have no value" do + assert_nil Attribute.uninitialized(:foo, nil).value + end + + test "attributes equal other attributes with the same constructor arguments" do + first = Attribute.from_database(:foo, 1, Type::Integer.new) + second = Attribute.from_database(:foo, 1, Type::Integer.new) + assert_equal first, second + end + + test "attributes do not equal attributes with different names" do + first = Attribute.from_database(:foo, 1, Type::Integer.new) + second = Attribute.from_database(:bar, 1, Type::Integer.new) + assert_not_equal first, second + end + + test "attributes do not equal attributes with different types" do + first = Attribute.from_database(:foo, 1, Type::Integer.new) + second = Attribute.from_database(:foo, 1, Type::Float.new) + assert_not_equal first, second + end + + test "attributes do not equal attributes with different values" do + first = Attribute.from_database(:foo, 1, Type::Integer.new) + second = Attribute.from_database(:foo, 2, Type::Integer.new) + assert_not_equal first, second + end + + test "attributes do not equal attributes of other classes" do + first = Attribute.from_database(:foo, 1, Type::Integer.new) + second = Attribute.from_user(:foo, 1, Type::Integer.new) + assert_not_equal first, second + end + + test "an attribute has not been read by default" do + attribute = Attribute.from_database(:foo, 1, Type::Value.new) + assert_not_predicate attribute, :has_been_read? + end + + test "an attribute has been read when its value is calculated" do + attribute = Attribute.from_database(:foo, 1, Type::Value.new) + attribute.value + assert_predicate attribute, :has_been_read? + end + + test "an attribute is not changed if it hasn't been assigned or mutated" do + attribute = Attribute.from_database(:foo, 1, Type::Value.new) + + assert_not_predicate attribute, :changed? + end + + test "an attribute is changed if it's been assigned a new value" do + attribute = Attribute.from_database(:foo, 1, Type::Value.new) + changed = attribute.with_value_from_user(2) + + assert_predicate changed, :changed? + end + + test "an attribute is not changed if it's assigned the same value" do + attribute = Attribute.from_database(:foo, 1, Type::Value.new) + unchanged = attribute.with_value_from_user(1) + + assert_not_predicate unchanged, :changed? + end + + test "an attribute can not be mutated if it has not been read, + and skips expensive calculations" do + type_which_raises_from_all_methods = Object.new + attribute = Attribute.from_database(:foo, "bar", type_which_raises_from_all_methods) + + assert_not_predicate attribute, :changed_in_place? + end + + test "an attribute is changed if it has been mutated" do + attribute = Attribute.from_database(:foo, "bar", Type::String.new) + attribute.value << "!" + + assert_predicate attribute, :changed_in_place? + assert_predicate attribute, :changed? + end + + test "an attribute can forget its changes" do + attribute = Attribute.from_database(:foo, "bar", Type::String.new) + changed = attribute.with_value_from_user("foo") + forgotten = changed.forgetting_assignment + + assert changed.changed? # sanity check + assert_not_predicate forgotten, :changed? + end + + test "with_value_from_user validates the value" do + type = Type::Value.new + type.define_singleton_method(:assert_valid_value) do |value| + if value == 1 + raise ArgumentError + end + end + + attribute = Attribute.from_database(:foo, 1, type) + assert_equal 1, attribute.value + assert_equal 2, attribute.with_value_from_user(2).value + assert_raises ArgumentError do + attribute.with_value_from_user(1) + end + end + + test "with_type preserves mutations" do + attribute = Attribute.from_database(:foo, +"", Type::Value.new) + attribute.value << "1" + + assert_equal 1, attribute.with_type(Type::Integer.new).value + end + end +end |