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node_modules/@n8n/eslint-plugin-community-nodes/docs/rules/credential-test-required.md

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+# Ensure credentials have a credential test (`@n8n/community-nodes/credential-test-required`)
+
+💼 This rule is enabled in the following configs: ✅ `recommended`, ☑️ `recommendedWithoutN8nCloudSupport`.
+
+💡 This rule is manually fixable by [editor suggestions](https://eslint.org/docs/latest/use/core-concepts#rule-suggestions).
+
+<!-- end auto-generated rule header -->
+
+## Rule Details
+
+Ensures that your credentials include a `test` method to validate user credentials. This helps users verify their credentials are working correctly.
+
+## Examples
+
+### ❌ Incorrect
+
+```typescript
+export class MyApiCredential implements ICredentialType {
+  name = 'myApi';
+  displayName = 'My API';
+  properties: INodeProperties[] = [
+    {
+      displayName: 'API Key',
+      name: 'apiKey',
+      type: 'string',
+      typeOptions: { password: true },
+      default: '',
+    },
+  ];
+  // Missing test method
+}
+```
+
+### ✅ Correct
+
+```typescript
+export class MyApiCredential implements ICredentialType {
+  name = 'myApi';
+  displayName = 'My API';
+  properties: INodeProperties[] = [
+    {
+      displayName: 'API Key',
+      name: 'apiKey',
+      type: 'string',
+      typeOptions: { password: true },
+      default: '',
+    },
+  ];
+
+  test: ICredentialTestRequest = {
+    request: {
+      baseURL: 'https://api.myservice.com',
+      url: '/user',
+      method: 'GET',
+    },
+  };
+}
+```