dynamodb_test.go

	// Add conditon and it should fail
	{
		err := dtable.PutItem(
			items[0],
			option.PutExpressionAttributeName("date", "#date"),
			option.PutCondition("attribute_not_exists(#date)"),
		)

		assert.Error(err)

		dynamoErr, ok := err.(awserr.Error)
		assert.True(ok, "err must be awserr.Error")
		assert.Equal("ConditionalCheckFailedException", dynamoErr.Code())
	}

	// Update the item with incrementing counter and setting role as StringSet
	{
		err := dtable.UpdateItem(
			hashKey,
			rangeKey,
			option.UpdateExpressionAttributeName("login_count", "#count"),
			option.UpdateExpressionAttributeName("role", "#role"),
			option.UpdateExpressionAttributeValue(":i", attributes.Number(1)),
			option.UpdateExpressionAttributeValue(":role", attributes.StringSet(role)),
			option.UpdateExpression("ADD #count :i SET #role = :role"),
		)
		if err != nil {
			t.Error(err)
		}
	}