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valid-describe.js
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valid-describe.js
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'use strict';
const getDocsUrl = require('./util').getDocsUrl;
const isDescribe = require('./util').isDescribe;
const isFunction = require('./util').isFunction;
const isAsync = node => node.async;
const isString = node =>
(node.type === 'Literal' && typeof node.value === 'string') ||
node.type === 'TemplateLiteral';
const hasParams = node => node.params.length > 0;
const paramsLocation = params => {
const first = params[0];
const last = params[params.length - 1];
return {
start: {
line: first.loc.start.line,
column: first.loc.start.column,
},
end: {
line: last.loc.end.line,
column: last.loc.end.column,
},
};
};
module.exports = {
meta: {
docs: {
url: getDocsUrl(__filename),
},
},
create(context) {
return {
CallExpression(node) {
if (isDescribe(node)) {
const name = node.arguments[0];
const callbackFunction = node.arguments[1];
if (!isString(name)) {
context.report({
message: 'First argument must be name',
loc: paramsLocation(node.arguments),
});
}
if (callbackFunction === undefined) {
return context.report({
message: 'Describe requires name and callback arguments',
loc: paramsLocation(node.arguments),
});
}
if (!isFunction(callbackFunction)) {
return context.report({
message: 'Second argument must be function',
loc: paramsLocation(node.arguments),
});
}
if (isAsync(callbackFunction)) {
context.report({
message: 'No async describe callback',
node: callbackFunction,
});
}
if (hasParams(callbackFunction)) {
context.report({
message: 'Unexpected argument(s) in describe callback',
loc: paramsLocation(callbackFunction.params),
});
}
callbackFunction.body.body.forEach(node => {
if (node.type === 'ReturnStatement') {
context.report({
message: 'Unexpected return statement in describe callback',
node,
});
}
});
}
},
};
},
};