additional tests for jingle

src/plugins/jingle/styles/jingle.scss

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+.conversejs {
+    .chatbox {
+        .chat-head {
+            .button-color{
+                color: var(--chat-head-text-color) !important;
+            }
+        }
+    }
+}

src/plugins/jingle/tests/jingle.js

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+/* global mock */
+
+describe("A Call Button", function () {
+
+    it("has been shown in the toolbar",
+            mock.initConverse(['chatBoxesFetched'], {}, async function (_converse) {
+
+        await mock.waitForRoster(_converse, 'current');
+        await mock.openControlBox(_converse);
+        const contact_jid = mock.cur_names[2].replace(/ /g,'.').toLowerCase() + '@montague.lit';
+        spyOn(_converse.api, "trigger").and.callThrough();
+        // First check that the button does show
+        await mock.openChatBoxFor(_converse, contact_jid);
+        const view = _converse.chatboxviews.get(contact_jid);
+        const toolbar = view.querySelector('.chat-toolbar');
+        const call_button = toolbar.querySelector('converse-jingle-toolbar-button');
+        // Now check that the state changes
+        // toggleJingleCallStatus
+        const chatbox = view.model;
+        call_button.click();
+        expect(chatbox.get('jingle_status') === _converse.JINGLE_CALL_STATUS.PENDING);
+        call_button.click();        
+    }));
+});