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libsiaweb/test/objAsString.test.ts

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2023-01-14 07:21:04 +00:00
import { objAsString } from "../src/objAsString";
test("objAsString", () => {
// Try undefined.
let undefinedVar;
const undefinedResult = objAsString(undefinedVar);
expect(undefinedResult).toBe("[cannot convert undefined to string]");
// Try null.
const nullVar = null;
const nullResult = objAsString(nullVar);
expect(nullResult).toBe("[cannot convert null to string]");
// Try a string.
const strResult = objAsString("asdf");
expect(strResult).toBe("asdf");
const strVar = "asdfasdf";
const strResult2 = objAsString(strVar);
expect(strResult2).toBe("asdfasdf");
// Try an object.
const objVar = { a: "b", b: 7 };
const objResult = objAsString(objVar);
expect(objResult).toBe('{"a":"b","b":7}');
// Try an object with a defined toString that is a function.
objVar.toString = function () {
return "b7";
};
const objResult3 = objAsString(objVar);
expect(objResult3).toBe("b7");
// Try an object with a defined toString that is not a function. We need to
// specifiy 'as any' because we already made 'toString' a string, and now we
// are redefining the field with a new type.
(objVar as any).toString = "b7";
const objResult2 = objAsString(objVar);
expect(objResult2).toBe('{"a":"b","b":7,"toString":"b7"}');
// Try testing an error object.
const err1 = new Error("this is an error");
const err1Result = objAsString(err1);
expect(err1Result).toBe("this is an error");
});