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test(type-utils): add tests for isSymbolFromDefaultLibrary #9385

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Merged
merged 2 commits into from
Jun 30, 2024
Merged

test(type-utils): add tests for isSymbolFromDefaultLibrary #9385

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test: add test case
y-hsgw Jun 19, 2024
f2cb3de
Merge branch 'main' into test/isSymbolFromDefaultLibrary
auvred Jun 30, 2024
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58 changes: 58 additions & 0 deletions packages/type-utils/tests/isSymbolFromDefaultLibrary.test.ts
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Original file line number Diff line number Diff line change
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import { parseForESLint } from '@typescript-eslint/parser';
import type { TSESTree } from '@typescript-eslint/typescript-estree';
import path from 'path';
import type * as ts from 'typescript';

import { isSymbolFromDefaultLibrary } from '../src';
import { expectToHaveParserServices } from './test-utils/expectToHaveParserServices';

describe('isSymbolFromDefaultLibrary', () => {
const rootDir = path.join(__dirname, 'fixtures');

function getTypes(code: string): {
program: ts.Program;
symbol: ts.Symbol | undefined;
} {
const { services, ast } = parseForESLint(code, {
project: './tsconfig.json',
filePath: path.join(rootDir, 'file.ts'),
tsconfigRootDir: rootDir,
});
expectToHaveParserServices(services);
const declaration = ast.body[0] as TSESTree.TSTypeAliasDeclaration;
const type = services.getTypeAtLocation(declaration.id);
return { program: services.program, symbol: type.getSymbol() };
}

function runTestForAliasDeclaration(code: string, expected: boolean): void {
const { program, symbol } = getTypes(code);
const result = isSymbolFromDefaultLibrary(program, symbol);
expect(result).toBe(expected);
}

describe('is symbol from default library', () => {
function runTest(code: string): void {
runTestForAliasDeclaration(code, true);
}

it.each([
['type Test = Array<number>;'],
['type Test = Map<string,number>;'],
['type Test = Promise<void>'],
['type Test = Error'],
['type Test = Object'],
])('when code is %s, returns true', runTest);
});

describe('is not symbol from default library', () => {
function runTest(code: string): void {
runTestForAliasDeclaration(code, false);
}

it.each([
['const test: Array<number> = [1,2,3];'],
['type Test = number;'],
['interface Test { bar: string; };'],
])('when code is %s, returns false', runTest);
});
});
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