minor [reddit] improvements (#7436)

* apply colour scheme to reddit karma badge

* accept negative metric in reddit karma tests

Co-authored-by: repo-ranger[bot] <39074581+repo-ranger[bot]@users.noreply.github.com>

services/reddit/user-karma.service.js

@@ -25,7 +25,7 @@ export default class RedditUserKarma extends BaseJsonService {
       staticPreview: {
         label: 'combined karma',
         message: 56,
-        color: 'red',
+        color: 'brightgreen',
         style: 'social',
       },
     },
@@ -44,7 +44,7 @@ export default class RedditUserKarma extends BaseJsonService {
     return {
       label,
       message: metric(karma),
-      color: 'red',
+      color: karma > 0 ? 'brightgreen' : karma === 0 ? 'orange' : 'red',
       link: [`https://www.reddit.com/u/${user}`],
     }
   }

services/reddit/user-karma.tester.js

@@ -1,4 +1,4 @@
-import { isMetric } from '../test-validators.js'
+import { isMetricAllowNegative } from '../test-validators.js'
 import { createServiceTester } from '../tester.js'
 export const t = await createServiceTester()
 
@@ -6,21 +6,21 @@ t.create('user-karma (valid - link)')
   .get('/link/user_simulator.json')
   .expectBadge({
     label: 'u/user_simulator karma (link)',
-    message: isMetric,
+    message: isMetricAllowNegative,
   })
 
 t.create('user-karma (valid - comment')
   .get('/comment/user_simulator.json')
   .expectBadge({
     label: 'u/user_simulator karma (comment)',
-    message: isMetric,
+    message: isMetricAllowNegative,
   })
 
 t.create('user-karma (valid - combined)')
   .get('/combined/user_simulator.json')
   .expectBadge({
     label: 'u/user_simulator karma',
-    message: isMetric,
+    message: isMetricAllowNegative,
   })
 
 t.create('user-karma (non-existing user)')