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prefer-todo.ts
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prefer-todo.ts
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import {
AST_NODE_TYPES,
TSESLint,
TSESTree,
} from '@typescript-eslint/experimental-utils';
import {
JestFunctionCallExpression,
TestCaseName,
createRule,
getNodeName,
hasOnlyOneArgument,
isFunction,
isStringNode,
isTestCaseCall,
} from './utils';
function isEmptyFunction(node: TSESTree.CallExpressionArgument) {
if (!isFunction(node)) {
return false;
}
return (
node.body.type === AST_NODE_TYPES.BlockStatement && !node.body.body.length
);
}
function createTodoFixer(
node: JestFunctionCallExpression<TestCaseName>,
fixer: TSESLint.RuleFixer,
) {
const testName = getNodeName(node).split('.').shift();
return fixer.replaceText(node.callee, `${testName}.todo`);
}
const isTargetedTestCase = (
node: TSESTree.CallExpression,
): node is JestFunctionCallExpression<TestCaseName> =>
isTestCaseCall(node) &&
[TestCaseName.it, TestCaseName.test, 'it.skip', 'test.skip'].includes(
getNodeName(node),
);
export default createRule({
name: __filename,
meta: {
docs: {
category: 'Best Practices',
description: 'Suggest using `test.todo`',
recommended: false,
},
messages: {
emptyTest: 'Prefer todo test case over empty test case',
unimplementedTest: 'Prefer todo test case over unimplemented test case',
},
fixable: 'code',
schema: [],
type: 'layout',
},
defaultOptions: [],
create(context) {
return {
CallExpression(node) {
const [title, callback] = node.arguments;
if (!title || !isTargetedTestCase(node) || !isStringNode(title)) {
return;
}
if (callback && isEmptyFunction(callback)) {
context.report({
messageId: 'emptyTest',
node,
fix: fixer => [
fixer.removeRange([title.range[1], callback.range[1]]),
createTodoFixer(node, fixer),
],
});
}
if (hasOnlyOneArgument(node)) {
context.report({
messageId: 'unimplementedTest',
node,
fix: fixer => [createTodoFixer(node, fixer)],
});
}
},
};
},
});