# test.govlab/patterns/core/classifiers/syntax.classifier.test.ts

> 24 lines of code and 0 definitions.

Tree: Codebase Testing
Language: typescript
Canonical: https://banes-lab.com/anatomy/testing#file-testing-test-govlab-patterns-core-classifiers-syntax-classifier-test-ts
Source text: https://banes-lab.com/source/testing/test.govlab/patterns/core/classifiers/syntax.classifier.test.ts.txt

Listed in [test.govlab/patterns/core/classifiers](https://banes-lab.com/api/source/testing/test.govlab/patterns/core/classifiers.md), after [test.govlab/patterns/core/classifiers/schema.classifier.test.ts](https://banes-lab.com/source/testing/test.govlab/patterns/core/classifiers/schema.classifier.test.ts.md).

## Contained in

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

## Source

```typescript
import {
    ROLE_CALL,
    ROLE_DEFINITION,
    ROLE_NODE,
    roleOf,
    stateOf,
} from "@govlab/patterns/core/classifiers/syntax.classifier.ts";
import { describe, expect, it } from "vitest";

describe("the syntax classifier", () => {
    it("roleOf reads the role from the node-type convention", () => {
        expect(roleOf("call_expression")).toBe(ROLE_CALL);
        expect(roleOf("function_declaration")).toBe(ROLE_DEFINITION);
        expect(roleOf("declaration_list")).toBe(ROLE_NODE);
        expect(roleOf("identifier")).toBe(ROLE_NODE);
    });

    it("stateOf takes the first matching state rule and defaults to structure", () => {
        expect(stateOf("call_expression")).toBe("call");
        expect(stateOf("assignment_expression")).toBe("write");
        expect(stateOf("lexical_declaration")).toBe("declare");
        expect(stateOf("if_statement")).toBe("control");
        expect(stateOf("member_expression")).toBe("read");
        expect(stateOf("program")).toBe("structure");
    });
});
```