Fix error message discrepancy in node 16

Author: axelrindle

lib/scheme-mapper.js

@@ -1,10 +1,18 @@
+function validate(obj) {
+	if (! obj) {
+		throw new Error('The object to map must not be falsy!');
+	}
+}
+
 /**
  * Maps a response object into the form described here:
  * https://github.com/axelrindle/github-version-checker/wiki/API#releases
  * 
  * @returns {ReleaseDescriptor}
  */
 module.exports.release = obj => {
+	validate(obj)
+
 	return {
 		name: obj.name,
 		tag: {
@@ -23,6 +31,8 @@ module.exports.release = obj => {
  * @returns {TagDescriptor}
  */
 module.exports.tag = obj => {
+	validate(obj)
+
 	return {
 		name: obj.name
 	}

test/test-scheme-mapper.js

@@ -50,12 +50,12 @@ test('scheme-mapper#release fails with invalid object', t => {
 	const error = t.throws(() => {
 		return schemeMapper.release(null);
 	});
-	t.is(error.message, 'Cannot read property \'name\' of null');
+	t.is(error.message, 'The object to map must not be falsy!');
 
 	const error2 = t.throws(() => {
 		return schemeMapper.release(undefined);
 	});
-	t.is(error2.message, 'Cannot read property \'name\' of undefined');
+	t.is(error2.message, 'The object to map must not be falsy!');
 });
 
 test('scheme-mapper#tag maps correctly', t => {
@@ -74,10 +74,10 @@ test('scheme-mapper#tag fails with invalid object', t => {
 	const error = t.throws(() => {
 		return schemeMapper.tag(null);
 	});
-	t.is(error.message, 'Cannot read property \'name\' of null');
+	t.is(error.message, 'The object to map must not be falsy!');
 
 	const error2 = t.throws(() => {
 		return schemeMapper.tag(undefined);
 	});
-	t.is(error2.message, 'Cannot read property \'name\' of undefined');
+	t.is(error2.message, 'The object to map must not be falsy!');
 });