# test.secrets/core/predicates/character.predicate.test.ts

> 13 lines of code and 0 definitions.

Tree: Codebase Testing
Language: typescript
Canonical: https://banes-lab.com/anatomy/testing#file-testing-test-secrets-core-predicates-character-predicate-test-ts
Source text: https://banes-lab.com/source/testing/test.secrets/core/predicates/character.predicate.test.ts.txt

Listed in [test.secrets/core/predicates](https://banes-lab.com/api/source/testing/test.secrets/core/predicates.md), before [test.secrets/core/predicates/environment.predicate.test.ts](https://banes-lab.com/source/testing/test.secrets/core/predicates/environment.predicate.test.ts.md).

## Contained in

- [test.secrets/core/predicates](https://banes-lab.com/anatomy/testing/folder-testing-test-secrets-core-predicates.md)

## Source

```typescript
import { describe, expect, it } from "vitest";
import { isBase64Url, isInAlphabet } from "@ssot/secrets/core/predicates/character.predicate.ts";

describe("isInAlphabet and isBase64Url", () => {
    it("hold a text to its declared alphabet", () => {
        expect(isInAlphabet("abc123", "alnum")).toBe(true);
        expect(isInAlphabet("abc-123", "alnum")).toBe(false);
        expect(isInAlphabet("abc-123", "alnumDash")).toBe(true);
        expect(isInAlphabet("ABC123", "upperDigit")).toBe(true);
        expect(isInAlphabet("Abc123", "upperDigit")).toBe(false);
        expect(isBase64Url("aB9-_")).toBe(true);
        expect(isBase64Url("aB9+/")).toBe(false);
    });
});
```