I am writing jest for this simple function:
function isVowel(ch) {
ch = ch.toUpperCase();
return ch == "A" || ch == "E" || ch == "I" || ch == "O" || ch == "U";
}
this is the jest:
const isVowel = require("./isVowel");
test("a is vowel", () => {
const ch = isVowel("a");
expect(ch).toBe("A");
});
on running, it gives error: TypeError: isVowel is not a function
how to resolve it?
I assume you write your code in commonjs format due to the way you require it in your test file so you just simply export like this:
// isVowel.js
function isVowel(ch) {
ch = ch.toUpperCase();
return ch == "A" || ch == "E" || ch == "I" || ch == "O" || ch == "U";
}
module.exports = isVowel;