Fixed tests for @tryghost/email-suppression-list

These were missing and caused the build to fail

ghost/email-suppression-list/package.json

@@ -8,6 +8,7 @@
   "scripts": {
     "dev": "echo \"Implement me!\"",
     "test": "NODE_ENV=testing c8 --all --check-coverage --reporter text --reporter cobertura mocha './test/**/*.test.js'",
+    "test:unit": "yarn test",
     "lint:code": "eslint *.js lib/ --ext .js --cache",
     "lint": "yarn lint:code && yarn lint:test",
     "lint:test": "eslint -c test/.eslintrc.js test/ --ext .js --cache"

ghost/email-suppression-list/test/index.test.js

@@ -0,0 +1,6 @@
+const assert = require('assert');
+describe('exports', function () {
+    it('exports the lib/email-suppression-list file', function () {
+       	assert(require('../') === require('../lib/email-suppression-list'));
+    });
+});

ghost/email-suppression-list/test/lib/email-suppression-list.test.js

@@ -0,0 +1,26 @@
+const assert = require('assert');
+const {EmailSuppressionData} = require('../../lib/email-suppression-list');
+
+describe('EmailSuppressionData', function () {
+    it('Has null info when not suppressed', function () {
+        const now = new Date();
+        const data = new EmailSuppressionData(false, {
+            reason: 'spam',
+            timestamp: now
+        });
+
+        assert(data.suppressed === false);
+        assert(data.info === null);
+    });
+    it('', function () {
+        const now = new Date();
+        const data = new EmailSuppressionData(true, {
+            reason: 'spam',
+            timestamp: now
+        });
+
+        assert(data.suppressed === true);
+        assert(data.info.reason === 'spam');
+        assert(data.info.timestamp === now);
+    });
+});