async function _subTestAtCursor()

in src/goTest.ts [78:151]
64 lines of code
16 McCabe index (conditional complexity)

async function _subTestAtCursor(
	goCtx: GoExtensionContext,
	goConfig: vscode.WorkspaceConfiguration,
	cmd: SubTestAtCursorCmd,
	args: any
) {
	const editor = vscode.window.activeTextEditor;
	if (!editor) {
		vscode.window.showInformationMessage('No editor is active.');
		return;
	}
	if (!editor.document.fileName.endsWith('_test.go')) {
		vscode.window.showInformationMessage('No tests found. Current file is not a test file.');
		return;
	}

	await editor.document.save();
	const testFunctions = (await getTestFunctions(goCtx, editor.document)) ?? [];
	// We use functionName if it was provided as argument
	// Otherwise find any test function containing the cursor.
	const currentTestFunctions = testFunctions.filter((func) => func.range.contains(editor.selection.start));
	const testFunctionName =
		args && args.functionName ? args.functionName : currentTestFunctions.map((el) => el.name)[0];

	if (!testFunctionName || currentTestFunctions.length === 0) {
		vscode.window.showInformationMessage('No test function found at cursor.');
		return;
	}

	let subTestName: string | undefined = args?.subTestName;

	if (!subTestName) {
		const testFunction = currentTestFunctions[0];
		const simpleRunRegex = /t.Run\("([^"]+)",/;
		const runRegex = /t.Run\(/;
		let lineText: string;
		let runMatch: RegExpMatchArray | null | undefined;
		let simpleMatch: RegExpMatchArray | null | undefined;
		for (let i = editor.selection.start.line; i >= testFunction.range.start.line; i--) {
			lineText = editor.document.lineAt(i).text;
			simpleMatch = lineText.match(simpleRunRegex);
			runMatch = lineText.match(runRegex);
			if (simpleMatch || (runMatch && !simpleMatch)) {
				break;
			}
		}

		if (!simpleMatch) {
			const input = await vscode.window.showInputBox({
				prompt: 'Enter sub test name'
			});
			if (input) {
				subTestName = input;
			} else {
				vscode.window.showInformationMessage('No subtest function with a simple subtest name found at cursor.');
				return;
			}
		} else {
			subTestName = simpleMatch[1];
		}
	}

	await editor.document.save();

	const escapedName = escapeSubTestName(testFunctionName, subTestName);

	if (cmd === 'debug') {
		return debugTestAtCursor(editor, escapedName, testFunctions, goConfig);
	} else if (cmd === 'test') {
		return runTestAtCursor(editor, escapedName, testFunctions, goConfig, cmd, args);
	} else {
		throw new Error(`Unsupported command: ${cmd}`);
	}
}