function generateTests()

in src/goGenerateTests.ts [161:242]
72 lines of code
17 McCabe index (conditional complexity)

function generateTests(
	ctx: vscode.ExtensionContext,
	goCtx: GoExtensionContext,
	conf: Config,
	goConfig: vscode.WorkspaceConfiguration
): Promise<boolean> {
	return new Promise<boolean>((resolve, reject) => {
		const cmd = getBinPath('gotests');
		let args = ['-w'];
		const goGenerateTestsFlags: string[] = goConfig['generateTestsFlags'] || [];

		for (let i = 0; i < goGenerateTestsFlags.length; i++) {
			const flag = goGenerateTestsFlags[i];
			if (flag === '-w' || flag === 'all') {
				continue;
			}
			if (flag === '-only') {
				i++;
				continue;
			}
			if (i + 1 < goGenerateTestsFlags.length && (flag === '-template_dir' || flag === '-template_params_file')) {
				const configFilePath = resolvePath(goGenerateTestsFlags[i + 1]);
				args.push(flag, configFilePath);
				i++;
				continue;
			}
			args.push(flag);
		}

		if (conf.func) {
			args = args.concat(['-only', `^${conf.func}$`, conf.dir]);
		} else {
			args = args.concat(['-all', conf.dir]);
		}

		cp.execFile(cmd, args, { env: toolExecutionEnvironment() }, (err, stdout, stderr) => {
			outputChannel.appendLine('Generating Tests: ' + cmd + ' ' + args.join(' '));

			try {
				if (err && (<any>err).code === 'ENOENT') {
					promptForMissingTool('gotests');
					return resolve(false);
				}
				if (err) {
					console.log(err);
					outputChannel.appendLine(err.message);
					return reject('Cannot generate test due to errors');
				}

				let message = stdout;
				let testsGenerated = false;

				// Expected stdout is of the format "Generated TestMain\nGenerated Testhello\n"
				if (stdout.startsWith(generatedWord)) {
					const lines = stdout
						.split('\n')
						.filter((element) => {
							return element.startsWith(generatedWord);
						})
						.map((element) => {
							return element.substr(generatedWord.length);
						});
					message = `Generated ${lines.join(', ')}`;
					testsGenerated = true;
				}

				vscode.window.showInformationMessage(message);
				outputChannel.append(message);

				if (testsGenerated && !conf.isTestFile) {
					toggleTestFile(ctx, goCtx)();
				}

				return resolve(true);
			} catch (e) {
				vscode.window.showInformationMessage((e as any).msg);
				outputChannel.append((e as any).msg);
				reject(e);
			}
		});
	});
}