# test.govlab/context/core/guards/context.guard.test.ts

> 28 lines of code and 0 definitions.

Tree: Codebase Testing
Language: typescript
Canonical: https://banes-lab.com/anatomy/testing#file-testing-test-govlab-context-core-guards-context-guard-test-ts
Source text: https://banes-lab.com/source/testing/test.govlab/context/core/guards/context.guard.test.ts.txt

Listed in [test.govlab/context/core/guards](https://banes-lab.com/api/source/testing/test.govlab/context/core/guards.md).

## Contained in

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

## Source

```typescript
import {
    isAlgoGrammar,
    isArchRelations,
    isLexicon,
    isPagGrammar,
    isReasonOntology,
    requireFace,
} from "@govlab/context/core/guards/context.guard.ts";
import assert from "node:assert/strict";
import { createGovlabContext } from "@govlab/context";
import { test } from "vitest";

const context = createGovlabContext();

test("each guard admits its own collection and refuses the others", () => {
    assert.equal(isArchRelations(context.arch), true);
    assert.equal(isArchRelations(context.lex), false);
    assert.equal(isLexicon(context.lex), true);
    assert.equal(isLexicon(context.arch), false);
    assert.equal(isAlgoGrammar(context.algo), true);
    assert.equal(isPagGrammar(context.pag), true);
    assert.equal(isReasonOntology(context.reason), true);
    assert.equal(isReasonOntology(null), false);
});

test("requireFace hands back a built collection and throws on an unbuilt one", () => {
    assert.equal(requireFace(context.pag, isPagGrammar, "pag"), context.pag);
    assert.throws(() => requireFace(undefined, isPagGrammar, "pag"), {
        message: 'govlab.context: collection "pag" was not built',
    });
});
```