diff --git a/frontend_tests/node_tests/reactions.js b/frontend_tests/node_tests/reactions.js
index 1118d06828..30ab89d482 100644
--- a/frontend_tests/node_tests/reactions.js
+++ b/frontend_tests/node_tests/reactions.js
@@ -1,4 +1,5 @@
-set_global('document', {});
+set_global('document', 'document-stub');
+set_global('$', global.make_zjquery());
 
 add_dependencies({
     people: 'js/people.js',
@@ -12,6 +13,10 @@ set_global('emoji', {
         octopus: 'octopus-css',
         smile: 'smile-css',
     },
+    emojis_by_name: {
+        alien: '1f47d',
+        smile: '1f604',
+    },
     realm_emojis: {},
 });
 
@@ -21,6 +26,8 @@ set_global('blueslip', {
 
 set_global('page_params', {user_id: 5});
 
+set_global('channel', {});
+
 (function make_people() {
     var alice = {
         email: 'alice@example.com',
@@ -42,26 +49,27 @@ set_global('page_params', {user_id: 5});
     people.add_in_realm(cali);
 }());
 
+var message = {
+    id: 1001,
+    reactions: [
+        {emoji_name: 'smile', user: {id: 5}},
+        {emoji_name: 'smile', user: {id: 6}},
+        {emoji_name: 'frown', user: {id: 7}},
+
+        // add some bogus user_ids
+        {emoji_name: 'octopus', user: {id: 8888}},
+        {emoji_name: 'frown', user: {id: 9999}},
+    ],
+};
+
+set_global('message_store', {
+    get: function (message_id) {
+        assert.equal(message_id, 1001);
+        return message;
+    },
+});
+
 (function test_basics() {
-    var message = {
-        id: 1001,
-        reactions: [
-            {emoji_name: 'smile', user: {id: 5}},
-            {emoji_name: 'smile', user: {id: 6}},
-            {emoji_name: 'frown', user: {id: 7}},
-
-            // add some bogus user_ids
-            {emoji_name: 'octopus', user: {id: 8888}},
-            {emoji_name: 'frown', user: {id: 9999}},
-        ],
-    };
-
-    set_global('message_store', {
-        get: function (message_id) {
-            assert.equal(message_id, 1001);
-            return message;
-        },
-    });
     var result = reactions.get_message_reactions(message);
 
     assert(reactions.current_user_has_reacted_to_emoji(message, 'smile'));
@@ -89,3 +97,33 @@ set_global('page_params', {user_id: 5});
    ];
    assert.deepEqual(result, expected_result);
 }());
+
+(function test_sending() {
+    var message_id = 1001; // see above for setup
+    var emoji_name = 'smile'; // should be a current reaction
+
+    global.with_stub(function (stub) {
+        global.channel.del = stub.f;
+        reactions.message_reaction_on_click(message_id, emoji_name);
+        var args = stub.get_args('args').args;
+        assert.equal(args.url, '/json/messages/1001/emoji_reactions/smile');
+
+        // args.success() does nothing; just make sure it doesn't crash
+        args.success();
+
+        // similarly, we only exercise the failure codepath
+        global.channel.xhr_error_message = function () {};
+        args.error();
+    });
+
+    emoji_name = 'alien'; // not set yet
+    global.with_stub(function (stub) {
+        global.channel.put = stub.f;
+        reactions.message_reaction_on_click(message_id, emoji_name);
+        var args = stub.get_args('args').args;
+        assert.equal(args.url, '/json/messages/1001/emoji_reactions/alien');
+    });
+
+    emoji_name = 'unknown-emoji';
+    reactions.message_reaction_on_click(message_id, emoji_name);
+}());