Merge branch 'master' into custom-discarded-job-handling

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..14d86cef97
--- /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".dup, ["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 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 is not changed if it hasn't been assigned or mutated" do
+      attribute = Attribute.from_database(:foo, 1, Type::Value.new)
+
+      refute 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 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)
+
+      refute 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 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 attribute.changed_in_place?
+      assert 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
+      refute 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, "".dup, Type::Value.new)
+      attribute.value << "1"
+
+      assert_equal 1, attribute.with_type(Type::Integer.new).value
+    end
+  end
+end