# rules/eslint/closure-tests-centralized.eslint.rule.ts

> 35 lines of code and 6 definitions.

Tree: Governance tree
Language: typescript
Canonical: https://banes-lab.com/anatomy/governance#file-governance-rules-eslint-closure-tests-centralized-eslint-rule-ts
Source text: https://banes-lab.com/source/governance/rules/eslint/closure-tests-centralized.eslint.rule.ts.txt

Listed in [rules/eslint](https://banes-lab.com/api/source/governance/rules/eslint.md), after [rules/eslint/closure-standalone-script-imported.eslint.rule.ts](https://banes-lab.com/source/governance/rules/eslint/closure-standalone-script-imported.eslint.rule.ts.md) and before [rules/eslint/closure-transitive-liveness.eslint.rule.ts](https://banes-lab.com/source/governance/rules/eslint/closure-transitive-liveness.eslint.rule.ts.md).

## Definitions

- `isTestFile` (lexical_declaration, line 8)
- `create` (method_definition, line 13, exported)
- `TEST_SUFFIXES` (lexical_declaration, line 6)
- `{ filename }` (lexical_declaration, line 14, exported)
- `basename` (lexical_declaration, line 15, exported)
- `program` (method_definition, line 20, exported)

## Uses

- [shared/factories/listener.factory.ts](https://banes-lab.com/source/governance/shared/factories/listener.factory.ts.md)

## Records this file grounds

- [Mirrored Test Placement](https://banes-lab.com/records/architecture/mirrored-test-placement.md)

## Records this file checks

- [Mirrored Test Placement](https://banes-lab.com/records/architecture/mirrored-test-placement.md)

## Source

```typescript
import type { LocalRule, RuleContext, RuleListener } from "../../types/rule.types.ts";
import { TEST_ROOT_SEGMENT, basenameOf, normalizePath } from "../../shared/resolvers/anchor.resolver.ts";
import { defineCheck } from "@govlab/context/check";
import { listener } from "../../shared/factories/listener.factory.ts";

const TEST_SUFFIXES = [".test.ts", ".spec.ts"];

const isTestFile = function isTestFile(basename: string): boolean {
    return TEST_SUFFIXES.some((suffix) => basename.endsWith(suffix));
};

export default {
    create(context: RuleContext): RuleListener {
        const { filename } = context;
        const basename = basenameOf(filename);
        if (!isTestFile(basename) || normalizePath(filename).includes(TEST_ROOT_SEGMENT)) {
            return {};
        }
        return listener({
            program(_view, node) {
                context.report({ data: { basename }, messageId: "misplacedTestFile", node });
            },
        });
    },
    meta: {
        docs: {
            checks: defineCheck({ detects: [], enforces: ["architecture:mirrored-test-placement"] }),
            description:
                "A test file must live under the centralized test root, in the container for the member it covers, mirroring that member's source tree. A test beside its source defeats the one axis the centralization exists for — running the whole surface, finding the gaps, and reading coverage as a structure parallel to the code.",
        },
        messages: {
            misplacedTestFile:
                "Test file '{{basename}}' lives outside the centralized test root. Move it under that root, into the container for the member it covers, at the path mirroring the subject's own — the mirror is what makes a missing test visible as a missing folder.",
        },
        schema: [],
        type: "problem",
    },
} satisfies LocalRule;
```