testCaseDuplicates

Reports test cases that are identical to previous test cases.

✅ This rule is included in the flint logical presets.

When writing tests for lint rules, it’s possible to accidentally create deeply identical test cases. Doing so provides no added benefit for testing and is unnecessary.

Examples

❌ Incorrect

ruleTester.describe(rule, {
  valid: ["a", "a"],
});

ruleTester.describe(rule, {
  invalid: [
    {
      code: `
                a;
            `,
      snapshot: `
                a;
                ~
                Lint report for a.
            `,
    },
    {
      code: `
                a;
            `,
      snapshot: `
                a;
                ~
                Lint report for a.
            `,
    },
  ],
});

✅ Correct

ruleTester.describe(rule, {
  valid: ["a", "b"],
});

ruleTester.describe(rule, {
  invalid: [
    {
      code: `
                a;
            `,
      snapshot: `
                a;
                ~
                Lint report for a.
            `,
    },
    {
      code: `
                b;
            `,
      snapshot: `
                b;
                ~
                Lint report for b.
            `,
    },
  ],
});

Options

This rule is not configurable.

Equivalents in Other Linters

• ESLint: eslint-plugin-eslint-plugin/no-identical-tests