test: add test

tests/index.ts

@@ -5,4 +5,5 @@ describe('get-tsconfig', ({ runTestSuite }) => {
 	runTestSuite(import('./specs/parse-tsconfig/index.js'));
 	runTestSuite(import('./specs/create-paths-matcher.js'));
 	runTestSuite(import('./specs/create-files-matcher.js'));
+	runTestSuite(import('./specs/issues.js'));
 });

tests/specs/issues.ts

@@ -0,0 +1,36 @@
+import path from 'path';
+import { createFixture } from 'fs-fixture';
+import { expect, testSuite } from 'manten';
+import { createTsconfigJson } from '../utils.js';
+import { createPathsMatcher, getTsconfig } from '#get-tsconfig';
+
+export default testSuite(({ test }) => {
+	test('#79 implicit relative base url', async () => {
+		await using fixture = await createFixture({
+			'some-dir/src/file.ts': '',
+			'some-dir/tsconfig.json': createTsconfigJson({
+				compilerOptions: {
+					paths: {
+						'@/*': ['./src/*'],
+					},
+				},
+			}),
+		});
+
+		const originalCwd = process.cwd();
+
+		try {
+			process.chdir(fixture.path);
+
+			const tsconfig = getTsconfig('./some-dir');
+			expect(tsconfig).not.toBeNull();
+
+			const matcher = createPathsMatcher(tsconfig!)!;
+			expect(matcher).not.toBeNull();
+
+			expect(matcher('@/file.ts').at(0)).toBe(path.join(fixture.path, 'some-dir/src/file.ts'));
+		} finally {
+			process.chdir(originalCwd);
+		}
+	});
+});