diff --git a/test/components/views/dialogs/ReactionsDialog-test.js b/test/components/views/dialogs/ReactionsDialog-test.js
new file mode 100644
index 00000000000..186a849dc42
--- /dev/null
+++ b/test/components/views/dialogs/ReactionsDialog-test.js
@@ -0,0 +1,118 @@
+import "../../../skinned-sdk";
+
+import React from "react";
+import { mount } from "enzyme";
+import { act } from "react-dom/test-utils";
+
+import * as TestUtils from "../../../test-utils";
+import ReactionsDialog from "../../../../src/components/views/dialogs/ReactionsDialog";
+
+describe("ReactionsDialog", () => {
+    const sourceRoom = "!111111111111111111:example.org";
+    const defaultMessage = TestUtils.mkMessage({
+        room: sourceRoom,
+        user: "@alice:example.org",
+        msg: "Hello world!",
+        event: true,
+    });
+    const room = TestUtils.mkStubRoom(sourceRoom);
+    room.getMember = (name) => ({ name });
+
+    const event1 = TestUtils.mkEvent({
+        type: "m.reaction",
+        content: ":)", // content is required
+        user: 'matti',
+        event: true,
+    });
+    const event2 = TestUtils.mkEvent({
+        type: "m.reaction",
+        content: ":)",
+        user: 'teppo',
+        event: true,
+    });
+    const mountReactionsDialog = async (message = defaultMessage) => {
+        const reactions = [
+            ["😊", new Set([event1])],
+            ["🌴", new Set([event2, event1])],
+        ];
+        reactions.getSortedAnnotationsByKey = jest.fn().mockReturnValue(reactions);
+
+        let wrapper;
+        await act(async () => {
+            wrapper = mount(
+                <ReactionsDialog
+                    reactions={reactions}
+                    room={room}
+                />,
+            );
+            // Wait one tick for our profile data to load so the state update happens within act
+            await new Promise(resolve => setImmediate(resolve));
+        });
+        wrapper.update();
+
+        return wrapper;
+    };
+
+    let wrapper;
+    describe("emoji list", () => {
+        beforeEach(async () => {
+            wrapper = await mountReactionsDialog();
+        });
+
+        it("shows correct total number of reactions", async () => {
+            const emojiList = wrapper.find('.mx_EmojiList > li');
+            expect(emojiList).toHaveLength(3);
+            expect(emojiList.at(0).text()).toContain('3');
+        });
+
+        it("shows correct reactions ordered by reaction count", async () => {
+            const emojiList = wrapper.find('.mx_EmojiList > li');
+            expect(emojiList.at(1).text()).toContain("🌴");
+            expect(emojiList.at(1).text()).toContain("2");
+            expect(emojiList.at(2).text()).toContain("😊");
+            expect(emojiList.at(2).text()).toContain("1");
+        });
+    });
+
+    describe("sender list", () => {
+        beforeEach(async () => {
+            wrapper = await mountReactionsDialog();
+        });
+
+        it("shows all senders and emojis by default, ordered by reaction count, sender name", async () => {
+            const senderList = wrapper.find('.mx_SenderList > li');
+            expect(senderList).toHaveLength(3);
+            expect(senderList.at(0).text()).toContain("🌴");
+            expect(senderList.at(0).text()).toContain("matti");
+            expect(senderList.at(1).text()).toContain("🌴");
+            expect(senderList.at(1).text()).toContain("teppo");
+            expect(senderList.at(2).text()).toContain("😊");
+            expect(senderList.at(2).text()).toContain("matti");
+        });
+
+        it("filters senders when clicking an emoji", async () => {
+            const emojiButtons = wrapper.find('.mx_EmojiList > li');
+
+            // 🌴
+            emojiButtons.at(1).find('div').simulate('click');
+            await new Promise(resolve => setImmediate(resolve));
+            let senderList = wrapper.find('.mx_SenderList > li');
+            expect(senderList).toHaveLength(2);
+            expect(senderList.at(0).text()).toContain('🌴');
+            expect(senderList.at(0).text()).toContain('matti');
+
+            // 😊
+            emojiButtons.at(2).find('div').simulate('click');
+            await new Promise(resolve => setImmediate(resolve));
+            senderList = wrapper.find('.mx_SenderList > li');
+            expect(senderList).toHaveLength(1);
+            expect(senderList.at(0).text()).toContain('😊');
+
+            // All
+            emojiButtons.at(0).find('div').simulate('click');
+            await new Promise(resolve => setImmediate(resolve));
+            senderList = wrapper.find('.mx_SenderList > li');
+            expect(senderList).toHaveLength(3);
+        });
+    });
+});