src/vs/platform/environment/common/environmentService.ts/AbstractNativeEnvironmentService/extensionTestsLocationURI
class AbstractNativeEnvironmentService:	get extensionTestsLocationURI(): URI | undefined {
		const extensionTestsPath = this.args.extensionTestsPath;
		if (extensionTestsPath) {
			if (/^[^:/?#]+?:\/\//.test(extensionTestsPath)) {
				return URI.parse(extensionTestsPath);
			}

			return URI.file(normalize(extensionTestsPath));
		}

		return undefined;
	}