diff options
Diffstat (limited to 'activerecord/test/cases/attribute_test.rb')
-rw-r--r-- | activerecord/test/cases/attribute_test.rb | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/activerecord/test/cases/attribute_test.rb b/activerecord/test/cases/attribute_test.rb new file mode 100644 index 0000000000..aa419c7a67 --- /dev/null +++ b/activerecord/test/cases/attribute_test.rb @@ -0,0 +1,192 @@ +require 'cases/helper' +require 'minitest/mock' + +module ActiveRecord + class AttributeTest < ActiveRecord::TestCase + setup do + @type = Minitest::Mock.new + @type.expect(:==, false, [false]) + 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 + 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 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 attribute.has_been_read? + 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 attribute.changed_in_place_from?("bar") + end + end +end |