feat(consistent-data-testid): add support for custom error message (#719)

Closes #718

* feat(consistent-data-testid): add support for custom message in the rule configuration

* feat(consistent-data-testid): update docs

* feat(consistent-data-testid): use undefined as default value for customMessage

* feat(consistent-data-testid): add comment to test case

Co-authored-by: Patrick Ahmetovic <patrick.ahmetovic@prescreen.io>

Author: patriscus

docs/rules/consistent-data-testid.md

@@ -34,6 +34,7 @@ const baz = (props) => <div>...</div>;
 | ----------------- | -------- | ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------- |
 | `testIdPattern`   | Yes      | None          | A regex used to validate the format of the `data-testid` value. `{fileName}` can optionally be used as a placeholder and will be substituted with the name of the file OR the name of the files parent directory in the case when the file name is `index.js` OR empty string in the case of dynamically changing routes (that contain square brackets) with `Gatsby.js` or `Next.js` | `^{fileName}(\_\_([A-Z]+[a-z]_?)+)_\$`                |
 | `testIdAttribute` | No       | `data-testid` | A string (or array of strings) used to specify the attribute used for querying by ID. This is only required if data-testid has been explicitly overridden in the [RTL configuration](https://testing-library.com/docs/dom-testing-library/api-queries#overriding-data-testid)                                                                                                         | `data-my-test-attribute`, `["data-testid", "testId"]` |
+| `customMessage`   | No       | `undefined`   | A string used to display a custom message whenever warnings/errors are reported.                                                                                                                                                                                                                                                                                                      | `A custom message`                                    |
 
 ## Example
 
@@ -59,6 +60,17 @@ const baz = (props) => <div>...</div>;
 }
 ```
 
+```json
+{
+	"testing-library/consistent-data-testid": [
+		2,
+		{
+			"customMessage": "A custom message"
+		}
+	]
+}
+```
+
 ## Notes
 
 - If you are using Gatsby.js's [client-only routes](https://www.gatsbyjs.com/docs/reference/routing/file-system-route-api/#syntax-client-only-routes) or Next.js's [dynamic routes](https://nextjs.org/docs/routing/dynamic-routes) and therefore have square brackets (`[]`) in the filename (e.g. `../path/to/[component].js`), the `{fileName}` placeholder will be replaced with an empty string. This is because a linter cannot know what the dynamic content will be at run time.

lib/rules/consistent-data-testid.ts

@@ -2,11 +2,14 @@ import { createTestingLibraryRule } from '../create-testing-library-rule';
 import { isJSXAttribute, isLiteral } from '../node-utils';
 
 export const RULE_NAME = 'consistent-data-testid';
-export type MessageIds = 'consistentDataTestId';
+export type MessageIds =
+	| 'consistentDataTestId'
+	| 'consistentDataTestIdCustomMessage';
 export type Options = [
 	{
 		testIdAttribute?: string[] | string;
 		testIdPattern: string;
+		customMessage?: string;
 	}
 ];
 
@@ -28,6 +31,7 @@ export default createTestingLibraryRule<Options, MessageIds>({
 		},
 		messages: {
 			consistentDataTestId: '`{{attr}}` "{{value}}" should match `{{regex}}`',
+			consistentDataTestIdCustomMessage: '`{{message}}`',
 		},
 		schema: [
 			{
@@ -53,6 +57,10 @@ export default createTestingLibraryRule<Options, MessageIds>({
 							},
 						],
 					},
+					customMessage: {
+						default: undefined,
+						type: 'string',
+					},
 				},
 			},
 		],
@@ -61,6 +69,7 @@ export default createTestingLibraryRule<Options, MessageIds>({
 		{
 			testIdPattern: '',
 			testIdAttribute: 'data-testid',
+			customMessage: undefined,
 		},
 	],
 	detectionOptions: {
@@ -69,7 +78,7 @@ export default createTestingLibraryRule<Options, MessageIds>({
 
 	create: (context, [options]) => {
 		const { getFilename } = context;
-		const { testIdPattern, testIdAttribute: attr } = options;
+		const { testIdPattern, testIdAttribute: attr, customMessage } = options;
 
 		function getFileNameData() {
 			const splitPath = getFilename().split('/');
@@ -100,6 +109,14 @@ export default createTestingLibraryRule<Options, MessageIds>({
 			}
 		}
 
+		function getErrorMessageId(): MessageIds {
+			if (customMessage === undefined) {
+				return 'consistentDataTestId';
+			}
+
+			return 'consistentDataTestIdCustomMessage';
+		}
+
 		return {
 			JSXIdentifier: (node) => {
 				if (
@@ -118,11 +135,12 @@ export default createTestingLibraryRule<Options, MessageIds>({
 				if (value && typeof value === 'string' && !regex.test(value)) {
 					context.report({
 						node,
-						messageId: 'consistentDataTestId',
+						messageId: getErrorMessageId(),
 						data: {
 							attr: node.name,
 							value,
 							regex,
+							message: customMessage,
 						},
 					});
 				}

tests/lib/rules/consistent-data-testid.test.ts

@@ -283,6 +283,7 @@ const invalidTestCases: InvalidTestCase[] = [
 					attr: 'data-testid',
 					value: 'Awesome__CoolStuff',
 					regex: '/error/',
+					message: '',
 				},
 			},
 		],
@@ -312,6 +313,7 @@ const invalidTestCases: InvalidTestCase[] = [
 					attr: 'data-testid',
 					value: 'Nope',
 					regex: '/matchMe/',
+					message: '',
 				},
 			},
 		],
@@ -342,6 +344,7 @@ const invalidTestCases: InvalidTestCase[] = [
 					attr: 'my-custom-attr',
 					value: 'WrongComponent__cool',
 					regex: '/^Parent(__([A-Z]+[a-z]*?)+)*$/',
+					message: '',
 				},
 			},
 		],
@@ -380,6 +383,7 @@ const invalidTestCases: InvalidTestCase[] = [
 					attr: 'another-custom-attr',
 					value: 'wrong',
 					regex: '/^right$/',
+					message: '',
 				},
 			},
 		],
@@ -409,6 +413,38 @@ const invalidTestCases: InvalidTestCase[] = [
 					attr: 'data-testid',
 					value: 'WrongComponent__cool',
 					regex: '/^Parent(__([A-Z]+[a-z]*?)+)*$/',
+					message: '',
+				},
+			},
+		],
+	},
+	{
+		code: ` // test for custom message
+            import React from 'react';
+            
+            const TestComponent = props => {
+              return (
+                <div data-testid="snake_case_value">
+                  Hello
+                </div>
+              )
+            };
+          `,
+		options: [
+			{
+				testIdPattern: '^([a-z][a-z0-9]*)(-[a-z0-9]+)*$', //kebab-case
+				customMessage: 'Please use kebab-cased data-testid values.',
+			},
+		],
+		filename: '/my/cool/__tests__/Parent/index.js',
+		errors: [
+			{
+				messageId: 'consistentDataTestIdCustomMessage',
+				data: {
+					attr: 'data-testid',
+					value: 'snake_case_value',
+					regex: '^([a-z][a-z0-9]*)(-[a-z0-9]+)*$',
+					message: 'Please use kebab-cased data-testid values.',
 				},
 			},
 		],