# test.govlab/quality/core/selectors/catalog.selector.test.ts

> 13 lines of code and 0 definitions.

Tree: Codebase Testing
Language: typescript
Canonical: https://banes-lab.com/anatomy/testing#file-testing-test-govlab-quality-core-selectors-catalog-selector-test-ts
Source text: https://banes-lab.com/source/testing/test.govlab/quality/core/selectors/catalog.selector.test.ts.txt

Listed in [test.govlab/quality/core/selectors](https://banes-lab.com/api/source/testing/test.govlab/quality/core/selectors.md), after [test.govlab/quality/core/selectors/block.selector.test.ts](https://banes-lab.com/source/testing/test.govlab/quality/core/selectors/block.selector.test.ts.md) and before [test.govlab/quality/core/selectors/concept.selector.test.ts](https://banes-lab.com/source/testing/test.govlab/quality/core/selectors/concept.selector.test.ts.md).

## Contained in

- [test.govlab/quality/core/selectors](https://banes-lab.com/anatomy/testing/folder-testing-test-govlab-quality-core-selectors.md)

## Source

```typescript
import { expect, test } from "vitest";
import { distinctRules } from "@govlab/quality/core/selectors/catalog.selector.ts";

test("distinctRules keeps the first rule of each id, in order", () => {
    const rules = [
        { ruleId: "a", tool: "one" },
        { ruleId: "b", tool: "one" },
        { ruleId: "a", tool: "two" },
    ];
    expect(distinctRules(rules)).toStrictEqual([
        { ruleId: "a", tool: "one" },
        { ruleId: "b", tool: "one" },
    ]);
});
```