correct exception spelling

test/arguments.js

@@ -27,7 +27,7 @@ test.before('setup', async t => {
 test('url is required', async t => {
 	try {
 		await got();
-		t.fail('Exception is not thrown');
+		t.fail('Exception was not thrown');
 	} catch (err) {
 		t.regexTest(/Parameter `url` must be a string or object, not undefined/, err.message);
 	}
@@ -55,7 +55,7 @@ test('overrides querystring from opts', async t => {
 test('should throw with auth in url', async t => {
 	try {
 		await got(`https://test:45d3ps453@account.myservice.com/api/token`);
-		t.fail('Exception is not thrown');
+		t.fail('Exception was not thrown');
 	} catch (err) {
 		t.regexTest(/Basic authentication must be done with auth option/, err.message);
 	}

test/helpers.js

@@ -32,14 +32,14 @@ test('promise mode', async t => {
 
 	try {
 		await got.get(`${s.url}/404`);
-		t.fail('Exception is not thrown');
+		t.fail('Exception was not thrown');
 	} catch (err) {
 		t.is(err.response.body, 'not found');
 	}
 
 	try {
 		await got.get('.com', {retries: 0});
-		t.fail('Exception is not thrown');
+		t.fail('Exception was not thrown');
 	} catch (err) {
 		t.ok(err);
 	}