write the captchas to tmp in tests ref #469 !258

lib/captcha/generators/grid.test.js

@@ -22,7 +22,15 @@ const cases = [
 describe('generate gridv1 captcha', () => {
 	for(let captchaOptions of cases) {	
 		test(captchaOptions.name, async () => {
-			expect((await gridv1(captchaOptions)));
+			const { captcha } = await gridv1(captchaOptions);
+			expect(await new Promise((res, rej) => {
+				captcha.write('/tmp/captcha.jpg', (err) => {
+					if (err) {
+						return rej(err);
+					}
+					res();
+				});
+			}));
 		});
 	}
 });
@@ -30,7 +38,15 @@ describe('generate gridv1 captcha', () => {
 describe('generate gridv2 captcha', () => {
 	for(let captchaOptions of cases) {	
 		test(captchaOptions.name, async () => {
-			expect((await gridv2(captchaOptions)));
+			const { captcha } = await gridv2(captchaOptions);
+			expect(await new Promise((res, rej) => {
+				captcha.write('/tmp/captcha.jpg', (err) => {
+					if (err) {
+						return rej(err);
+					}
+					res();
+				});
+			}));
 		});
 	}
 });

lib/captcha/generators/text.test.js

@@ -14,7 +14,15 @@ describe('generate text captcha', () => {
 	];
 	for(let captchaOptions of cases) {	
 		test(captchaOptions.name, async () => {
-			expect((await generateCaptcha(captchaOptions)));
+			const { captcha } = await generateCaptcha(captchaOptions);
+			expect(await new Promise((res, rej) => {
+				captcha.write('/tmp/captcha.jpg', (err) => {
+					if (err) {
+						return rej(err);
+					}
+					res();
+				});
+			}));
 		});
 	}
 });