diff --git a/test/components/views/elements/MemberEventListSummary-test.js b/test/components/views/elements/MemberEventListSummary-test.js
new file mode 100644
index 0000000000..af4d92fa61
--- /dev/null
+++ b/test/components/views/elements/MemberEventListSummary-test.js
@@ -0,0 +1,556 @@
+const expect = require('expect');
+const React = require('react');
+const ReactDOM = require("react-dom");
+const ReactTestUtils = require('react-addons-test-utils');
+const sdk = require('matrix-react-sdk');
+const MemberEventListSummary = sdk.getComponent('views.elements.MemberEventListSummary');
+
+const testUtils = require('../../../test-utils');
+describe.only('MemberEventListSummary', function() {
+    let sandbox;
+    let parentDiv;
+
+    const generateTiles = (events) => {
+        return events.map((e) => {
+            return (
+                <div key={e.getId()} className="event_tile">
+                    Expanded membership
+                </div>
+            );
+        });
+    };
+
+    const generateMembershipEvent = (eventId, parameters) => {
+        let membership = parameters.membership;
+        let userId = parameters.userId;
+        let prevMembership = parameters.prevMembership;
+        let senderId = parameters.senderId;
+        return {
+            content: {
+                membership: membership,
+            },
+            target: {
+                name: userId.match(/@([^:]*):/)[1],
+                getAvatarUrl: () => {
+                    return "avatar.jpeg";
+                },
+                userId: userId,
+            },
+            getId: () => {
+                return eventId;
+            },
+            getContent: function() {
+                return this.content;
+            },
+            getPrevContent: function() {
+                return {
+                    membership: prevMembership ? prevMembership : this.content,
+                };
+            },
+            getSender: () => {
+                return senderId || userId;
+            },
+            getStateKey: () => {
+                return userId;
+            },
+        };
+    };
+
+    const generateEvents = (parameters) => {
+        const res = [];
+        for (let i = 0; i < parameters.length; i++) {
+            res.push(generateMembershipEvent(`event${i}`, parameters[i]));
+        }
+        return res;
+    };
+
+    const generateEventsForUsers = (userIdTemplate, n, events) => {
+        let eventsForUsers = [];
+        let userId = "";
+        for (let i = 0; i < n; i++) {
+            userId = userIdTemplate.replace('$', i);
+            events.forEach((e) => {
+                e.userId = userId;
+                return e;
+            });
+            eventsForUsers = eventsForUsers.concat(generateEvents(events));
+        }
+        return eventsForUsers;
+    };
+
+    beforeEach(function() {
+        testUtils.beforeEach(this);
+        sandbox = testUtils.stubClient();
+        parentDiv = document.createElement('div');
+        document.body.appendChild(parentDiv);
+    });
+
+    afterEach(function() {
+        sandbox.restore();
+    });
+
+    it('renders expanded events if there are less than props.threshold', function(done) {
+        const events = generateEvents([
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 1,
+            avatarsMaxLength : 5,
+            threshold : 3,
+        };
+
+        const renderer = ReactTestUtils.createRenderer();
+        renderer.render(<MemberEventListSummary {...props} />);
+        const result = renderer.getRenderOutput();
+
+        expect(result.type).toBe('div');
+        expect(result.props.children).toEqual([
+          <div className="event_tile" key="event0">Expanded membership</div>,
+        ]);
+        done();
+    });
+
+    it('renders expanded events if there are less than props.threshold', function(done) {
+        const events = generateEvents([
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 1,
+            avatarsMaxLength : 5,
+            threshold : 3,
+        };
+
+        const renderer = ReactTestUtils.createRenderer();
+        renderer.render(<MemberEventListSummary {...props} />);
+        const result = renderer.getRenderOutput();
+
+        expect(result.type).toBe('div');
+        expect(result.props.children).toEqual([
+          <div className="event_tile" key="event0">Expanded membership</div>,
+          <div className="event_tile" key="event1">Expanded membership</div>,
+        ]);
+        done();
+    });
+
+    it('renders collapsed events if events.length = props.threshold', function(done) {
+        const events = generateEvents([
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 1,
+            avatarsMaxLength : 5,
+            threshold : 3,
+        };
+
+        const instance = ReactDOM.render(<MemberEventListSummary {...props} />, parentDiv);
+        const summary = ReactTestUtils.findRenderedDOMComponentWithClass(instance, "mx_MemberEventListSummary_summary");
+        const summaryText = summary.innerText;
+
+        expect(summaryText).toBe("user_1 joined and left and joined");
+
+        done();
+    });
+
+    it('truncates long join,leave repetitions', function(done) {
+        const events = generateEvents([
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 1,
+            avatarsMaxLength : 5,
+            threshold : 3,
+        };
+
+        const instance = ReactDOM.render(<MemberEventListSummary {...props} />, parentDiv);
+        const summary = ReactTestUtils.findRenderedDOMComponentWithClass(instance, "mx_MemberEventListSummary_summary");
+        const summaryText = summary.innerText;
+
+        expect(summaryText).toBe("user_1 joined and left 7 times");
+
+        done();
+    });
+
+    it('truncates long join,leave repetitions inbetween other events', function(done) {
+        const events = generateEvents([
+            {userId : "@user_1:some.domain", prevMembership: "ban", membership: "leave", senderId: "@some_other_user:some.domain"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "invite", senderId: "@some_other_user:some.domain"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 1,
+            avatarsMaxLength : 5,
+            threshold : 3,
+        };
+
+        const instance = ReactDOM.render(<MemberEventListSummary {...props} />, parentDiv);
+        const summary = ReactTestUtils.findRenderedDOMComponentWithClass(instance, "mx_MemberEventListSummary_summary");
+        const summaryText = summary.innerText;
+
+        expect(summaryText).toBe("user_1 was unbanned, joined and left 7 times and was invited");
+
+        done();
+    });
+
+    it('truncates multiple sequences of repetitions with other events inbetween', function(done) {
+        const events = generateEvents([
+            {userId : "@user_1:some.domain", prevMembership: "ban", membership: "leave", senderId: "@some_other_user:some.domain"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "ban", senderId: "@some_other_user:some.domain"},
+            {userId : "@user_1:some.domain", prevMembership: "ban", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "invite", senderId: "@some_other_user:some.domain"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 1,
+            avatarsMaxLength : 5,
+            threshold : 3,
+        };
+
+        const instance = ReactDOM.render(<MemberEventListSummary {...props} />, parentDiv);
+        const summary = ReactTestUtils.findRenderedDOMComponentWithClass(instance, "mx_MemberEventListSummary_summary");
+        const summaryText = summary.innerText;
+
+        expect(summaryText).toBe("user_1 was unbanned, joined and left 2 times, was banned, joined and left 3 times and was invited");
+
+        done();
+    });
+
+    it('handles multple users following the same sequence of memberships', function(done) {
+        const events = generateEvents([
+            // user_1
+            {userId : "@user_1:some.domain", prevMembership: "ban", membership: "leave", senderId: "@some_other_user:some.domain"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "ban", senderId: "@some_other_user:some.domain"},
+            // user_2
+            {userId : "@user_2:some.domain", prevMembership: "ban", membership: "leave", senderId: "@some_other_user:some.domain"},
+            {userId : "@user_2:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_2:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_2:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_2:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_2:some.domain", prevMembership: "leave", membership: "ban", senderId: "@some_other_user:some.domain"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 1,
+            avatarsMaxLength : 5,
+            threshold : 3,
+        };
+
+        const instance = ReactDOM.render(<MemberEventListSummary {...props} />, parentDiv);
+        const summary = ReactTestUtils.findRenderedDOMComponentWithClass(instance, "mx_MemberEventListSummary_summary");
+        const summaryText = summary.innerText;
+
+        expect(summaryText).toBe("user_1 and 1 other were unbanned, joined and left 2 times and were banned");
+
+        done();
+    });
+
+    it('handles multple users following the same sequence of memberships', function(done) {
+        const events = generateEvents([
+            // user_1
+            {userId : "@user_1:some.domain", prevMembership: "ban", membership: "leave", senderId: "@some_other_user:some.domain"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "ban", senderId: "@some_other_user:some.domain"},
+            // user_2
+            {userId : "@user_2:some.domain", prevMembership: "ban", membership: "leave", senderId: "@some_other_user:some.domain"},
+            {userId : "@user_2:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_2:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_2:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_2:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_2:some.domain", prevMembership: "leave", membership: "ban", senderId: "@some_other_user:some.domain"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 1,
+            avatarsMaxLength : 5,
+            threshold : 3,
+        };
+
+        const instance = ReactDOM.render(<MemberEventListSummary {...props} />, parentDiv);
+        const summary = ReactTestUtils.findRenderedDOMComponentWithClass(instance, "mx_MemberEventListSummary_summary");
+        const summaryText = summary.innerText;
+
+        expect(summaryText).toBe("user_1 and 1 other were unbanned, joined and left 2 times and were banned");
+
+        done();
+    });
+
+    it('handles many users following the same sequence of memberships', function(done) {
+        const events = generateEventsForUsers("@user_$:some.domain", 20, [
+            {prevMembership: "ban", membership: "leave", senderId: "@some_other_user:some.domain"},
+            {prevMembership: "leave", membership: "join"},
+            {prevMembership: "join", membership: "leave"},
+            {prevMembership: "leave", membership: "join"},
+            {prevMembership: "join", membership: "leave"},
+            {prevMembership: "leave", membership: "ban", senderId: "@some_other_user:some.domain"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 1,
+            avatarsMaxLength : 5,
+            threshold : 3,
+        };
+
+        const instance = ReactDOM.render(<MemberEventListSummary {...props} />, parentDiv);
+        const summary = ReactTestUtils.findRenderedDOMComponentWithClass(instance, "mx_MemberEventListSummary_summary");
+        const summaryText = summary.innerText;
+
+        expect(summaryText).toBe("user_0 and 19 others were unbanned, joined and left 2 times and were banned");
+
+        done();
+    });
+
+    it('correctly orders sequences of transitions by the order of their first event', function(done) {
+        const events = generateEvents([
+            {userId : "@user_2:some.domain", prevMembership: "ban", membership: "leave", senderId: "@some_other_user:some.domain"},
+            {userId : "@user_1:some.domain", prevMembership: "ban", membership: "leave", senderId: "@some_other_user:some.domain"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "leave", membership: "ban", senderId: "@some_other_user:some.domain"},
+            {userId : "@user_2:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_2:some.domain", prevMembership: "join", membership: "leave"},
+            {userId : "@user_2:some.domain", prevMembership: "leave", membership: "join"},
+            {userId : "@user_2:some.domain", prevMembership: "join", membership: "leave"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 1,
+            avatarsMaxLength : 5,
+            threshold : 3,
+        };
+
+        const instance = ReactDOM.render(<MemberEventListSummary {...props} />, parentDiv);
+        const summary = ReactTestUtils.findRenderedDOMComponentWithClass(instance, "mx_MemberEventListSummary_summary");
+        const summaryText = summary.innerText;
+
+        expect(summaryText).toBe(
+            "user_2 was unbanned and joined and left 2 times, user_1 was unbanned, joined and left 2 times and was banned"
+        );
+
+        done();
+    });
+
+    it('correctly identifies transitions', function(done) {
+        const events = generateEvents([
+            // invited
+            {userId : "@user_1:some.domain", membership: "invite"},
+            // banned
+            {userId : "@user_1:some.domain", membership: "ban"},
+            // joined
+            {userId : "@user_1:some.domain", membership: "join"},
+            // invite_reject
+            {userId : "@user_1:some.domain", prevMembership: "invite", membership: "leave"},
+            // left
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave"},
+            // invite_withdrawal
+            {userId : "@user_1:some.domain", prevMembership: "invite", membership: "leave", senderId: "@some_other_user:some.domain"},
+            // unbanned
+            {userId : "@user_1:some.domain", prevMembership: "ban", membership: "leave", senderId: "@some_other_user:some.domain"},
+            // kicked
+            {userId : "@user_1:some.domain", prevMembership: "join", membership: "leave", senderId: "@some_other_user:some.domain"},
+            // default = left
+            {userId : "@user_1:some.domain", prevMembership: "????", membership: "leave", senderId: "@some_other_user:some.domain"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 1,
+            avatarsMaxLength : 5,
+            threshold : 3,
+        };
+
+        const instance = ReactDOM.render(<MemberEventListSummary {...props} />, parentDiv);
+        const summary = ReactTestUtils.findRenderedDOMComponentWithClass(instance, "mx_MemberEventListSummary_summary");
+        const summaryText = summary.innerText;
+
+        expect(summaryText).toBe(
+            "user_1 was invited, was banned, joined, rejected their invitation, left, had their invitation withdrawn, was unbanned, was kicked and left"
+        );
+
+        done();
+    });
+
+    it('handles invitation plurals correctly when there are multiple users', function(done) {
+        const events = generateEvents([
+            {userId : "@user_1:some.domain", prevMembership: "invite", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "invite", membership: "leave", senderId: "@some_other_user:some.domain"},
+            {userId : "@user_2:some.domain", prevMembership: "invite", membership: "leave"},
+            {userId : "@user_2:some.domain", prevMembership: "invite", membership: "leave", senderId: "@some_other_user:some.domain"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 1,
+            avatarsMaxLength : 5,
+            threshold : 3,
+        };
+
+        const instance = ReactDOM.render(<MemberEventListSummary {...props} />, parentDiv);
+        const summary = ReactTestUtils.findRenderedDOMComponentWithClass(instance, "mx_MemberEventListSummary_summary");
+        const summaryText = summary.innerText;
+
+        expect(summaryText).toBe(
+            "user_1 and 1 other rejected their invitations and had their invitations withdrawn"
+        );
+
+        done();
+    });
+
+    it('handles invitation plurals correctly when there are multiple invites', function(done) {
+        const events = generateEvents([
+            {userId : "@user_1:some.domain", prevMembership: "invite", membership: "leave"},
+            {userId : "@user_1:some.domain", prevMembership: "invite", membership: "leave"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 1,
+            avatarsMaxLength : 5,
+            threshold : 1, // threshold = 1 to force collapse
+        };
+
+        const instance = ReactDOM.render(<MemberEventListSummary {...props} />, parentDiv);
+        const summary = ReactTestUtils.findRenderedDOMComponentWithClass(instance, "mx_MemberEventListSummary_summary");
+        const summaryText = summary.innerText;
+
+        expect(summaryText).toBe(
+            "user_1 rejected their invitations 2 times"
+        );
+
+        done();
+    });
+
+    it('handles a summary length = 2, with no "others"', function(done) {
+        const events = generateEvents([
+            {userId : "@user_1:some.domain", membership: "join"},
+            {userId : "@user_1:some.domain", membership: "join"},
+            {userId : "@user_2:some.domain", membership: "join"},
+            {userId : "@user_2:some.domain", membership: "join"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 2,
+            avatarsMaxLength : 5,
+            threshold : 3,
+        };
+
+        const instance = ReactDOM.render(<MemberEventListSummary {...props} />, parentDiv);
+        const summary = ReactTestUtils.findRenderedDOMComponentWithClass(instance, "mx_MemberEventListSummary_summary");
+        const summaryText = summary.innerText;
+
+        expect(summaryText).toBe(
+            "user_1 and user_2 joined 2 times"
+        );
+
+        done();
+    });
+
+    it('handles a summary length = 2, with 1 "other"', function(done) {
+        const events = generateEvents([
+            {userId : "@user_1:some.domain", membership: "join"},
+            {userId : "@user_2:some.domain", membership: "join"},
+            {userId : "@user_3:some.domain", membership: "join"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 2,
+            avatarsMaxLength : 5,
+            threshold : 3,
+        };
+
+        const instance = ReactDOM.render(<MemberEventListSummary {...props} />, parentDiv);
+        const summary = ReactTestUtils.findRenderedDOMComponentWithClass(instance, "mx_MemberEventListSummary_summary");
+        const summaryText = summary.innerText;
+
+        expect(summaryText).toBe(
+            "user_1, user_2 and 1 other joined"
+        );
+
+        done();
+    });
+
+    it('handles a summary length = 2, with many "others"', function(done) {
+        const events = generateEventsForUsers("@user_$:some.domain", 20, [
+            {membership: "join"},
+        ]);
+        const props = {
+            events : events,
+            children : generateTiles(events),
+            summaryLength : 2,
+            avatarsMaxLength : 5,
+            threshold : 3,
+        };
+
+        const instance = ReactDOM.render(<MemberEventListSummary {...props} />, parentDiv);
+        const summary = ReactTestUtils.findRenderedDOMComponentWithClass(instance, "mx_MemberEventListSummary_summary");
+        const summaryText = summary.innerText;
+
+        expect(summaryText).toBe(
+            "user_0, user_1 and 18 others joined"
+        );
+
+        done();
+    });
+});
\ No newline at end of file