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test(type-utils): add tests for getDeclaration #10074

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Merged
merged 3 commits into from
Oct 14, 2024
Merged

test(type-utils): add tests for getDeclaration #10074

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c365b73
getDeclaration test
YuyaYoshioka Sep 29, 2024
93615cb
Merge branch 'main' into 8358-getDeclaration
YuyaYoshioka Sep 29, 2024
14db76c
create mock function
YuyaYoshioka Oct 11, 2024
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55 changes: 55 additions & 0 deletions packages/type-utils/tests/getDeclaration.test.ts
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Original file line number Diff line number Diff line change
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import type { TSESTree } from '@typescript-eslint/types';
import type { ParserServicesWithTypeInformation } from '@typescript-eslint/typescript-estree';
import type * as ts from 'typescript';

import { getDeclaration } from '../src';

const node = {} as TSESTree.Node;

const mockSymbol = (declarations?: ts.Declaration[]): ts.Symbol => {
return {
getDeclarations: () => declarations,
} as ts.Symbol;
};

const mockServices = (
symbol?: ts.Symbol,
): ParserServicesWithTypeInformation => {
return {
getSymbolAtLocation: (_: TSESTree.Node) => symbol,
} as ParserServicesWithTypeInformation;
};

const mockDeclaration = (): ts.Declaration => {
return {} as ts.Declaration;
};

describe('getDeclaration', () => {
describe('when symbol does not exist', () => {
it('returns null', () => {
const services = mockServices();

expect(getDeclaration(services, node)).toBeNull();
});
});

describe('when declarations do not exist', () => {
it('returns null', () => {
const symbol = mockSymbol();
const services = mockServices(symbol);

expect(getDeclaration(services, node)).toBeNull();
});
});

describe('when declarations exist', () => {
it('returns the first declaration', () => {
const declaration1 = mockDeclaration();
const declaration2 = mockDeclaration();
const symbol = mockSymbol([declaration1, declaration2]);
const services = mockServices(symbol);

expect(getDeclaration(services, node)).toBe(declaration1);
});
});
});
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