Add test for error scenarios

Author: axelrindle

test/test-errors.js

@@ -0,0 +1,16 @@
+// require modules
+/** @type {import('ava').TestInterface} */
+const test = require('ava');
+const versionCheck = require('../');
+
+test('fails when trying to exclude pre-releases in the graphql call', async t => {
+	await t.throwsAsync(async () => {
+		await versionCheck({
+			token: 'hello there',
+			owner: 'axelrindle',
+			repo: 'github-version-checker',
+			currentVersion: '0.0.1',
+			excludePrereleases: true
+		});
+	});
+});