diff --git a/test/DecryptionFailureTracker-test.js b/test/DecryptionFailureTracker-test.js
index 617c9d5d68..baa0545f77 100644
--- a/test/DecryptionFailureTracker-test.js
+++ b/test/DecryptionFailureTracker-test.js
@@ -54,7 +54,7 @@ describe('DecryptionFailureTracker', function() {
         // Immediately track the newest failures
         tracker.trackFailures();
 
-        expect(count).toNotBe(0, 'should track a failure for an event that failed decryption');
+        expect(count).not.toBe(0, 'should track a failure for an event that failed decryption');
 
         done();
     });
diff --git a/test/components/structures/GroupView-test.js b/test/components/structures/GroupView-test.js
index 89632dcc48..b49c335bdf 100644
--- a/test/components/structures/GroupView-test.js
+++ b/test/components/structures/GroupView-test.js
@@ -185,21 +185,21 @@ describe('GroupView', function() {
             const avatar = ReactTestUtils.findRenderedComponentWithType(root, sdk.getComponent('avatars.GroupAvatar'));
             const img = ReactTestUtils.findRenderedDOMComponentWithTag(avatar, 'img');
             const avatarImgElement = ReactDOM.findDOMNode(img);
-            expect(avatarImgElement).toExist();
-            expect(avatarImgElement.src).toInclude(
+            expect(avatarImgElement).toBeTruthy();
+            expect(avatarImgElement.src).toContain(
                 'https://my.home.server/_matrix/media/v1/thumbnail/' +
                 'someavatarurl?width=48&height=48&method=crop',
             );
 
             const name = ReactTestUtils.findRenderedDOMComponentWithClass(root, 'mx_GroupView_header_name');
             const nameElement = ReactDOM.findDOMNode(name);
-            expect(nameElement).toExist();
-            expect(nameElement.innerText).toInclude('The name of a community');
-            expect(nameElement.innerText).toInclude(groupId);
+            expect(nameElement).toBeTruthy();
+            expect(nameElement.innerText).toContain('The name of a community');
+            expect(nameElement.innerText).toContain(groupId);
 
             const shortDesc = ReactTestUtils.findRenderedDOMComponentWithClass(root, 'mx_GroupView_header_shortDesc');
             const shortDescElement = ReactDOM.findDOMNode(shortDesc);
-            expect(shortDescElement).toExist();
+            expect(shortDescElement).toBeTruthy();
             expect(shortDescElement.innerText).toBe('This is a community');
         });
 
@@ -219,7 +219,7 @@ describe('GroupView', function() {
 
             const longDesc = ReactTestUtils.findRenderedDOMComponentWithClass(root, 'mx_GroupView_groupDesc');
             const longDescElement = ReactDOM.findDOMNode(longDesc);
-            expect(longDescElement).toExist();
+            expect(longDescElement).toBeTruthy();
             expect(longDescElement.innerText).toBe('This is a LONG description.');
             expect(longDescElement.innerHTML).toBe('<div dir="auto">This is a <b>LONG</b> description.</div>');
         });
@@ -239,7 +239,7 @@ describe('GroupView', function() {
             const placeholder = ReactTestUtils
                 .findRenderedDOMComponentWithClass(root, 'mx_GroupView_groupDesc_placeholder');
             const placeholderElement = ReactDOM.findDOMNode(placeholder);
-            expect(placeholderElement).toExist();
+            expect(placeholderElement).toBeTruthy();
         });
 
         httpBackend
@@ -258,15 +258,15 @@ describe('GroupView', function() {
         const prom = waitForUpdate(groupView, 4).then(() => {
             const longDesc = ReactTestUtils.findRenderedDOMComponentWithClass(root, 'mx_GroupView_groupDesc');
             const longDescElement = ReactDOM.findDOMNode(longDesc);
-            expect(longDescElement).toExist();
+            expect(longDescElement).toBeTruthy();
 
-            expect(longDescElement.innerHTML).toInclude('<h1>This is a more complicated group page</h1>');
-            expect(longDescElement.innerHTML).toInclude('<p>With paragraphs</p>');
-            expect(longDescElement.innerHTML).toInclude('<ul>');
-            expect(longDescElement.innerHTML).toInclude('<li>And lists!</li>');
+            expect(longDescElement.innerHTML).toContain('<h1>This is a more complicated group page</h1>');
+            expect(longDescElement.innerHTML).toContain('<p>With paragraphs</p>');
+            expect(longDescElement.innerHTML).toContain('<ul>');
+            expect(longDescElement.innerHTML).toContain('<li>And lists!</li>');
 
             const imgSrc = "https://my.home.server/_matrix/media/v1/thumbnail/someimageurl?width=800&amp;height=600";
-            expect(longDescElement.innerHTML).toInclude('<img src="' + imgSrc + '">');
+            expect(longDescElement.innerHTML).toContain('<img src="' + imgSrc + '">');
         });
 
         httpBackend
@@ -285,11 +285,11 @@ describe('GroupView', function() {
         const prom = waitForUpdate(groupView, 4).then(() => {
             const longDesc = ReactTestUtils.findRenderedDOMComponentWithClass(root, 'mx_GroupView_groupDesc');
             const longDescElement = ReactDOM.findDOMNode(longDesc);
-            expect(longDescElement).toExist();
+            expect(longDescElement).toBeTruthy();
 
             // If this fails, the URL could be in an img `src`, which is what we care about but
             // there's no harm in keeping this simple and checking the entire HTML string.
-            expect(longDescElement.innerHTML).toExclude('evilimageurl');
+            expect(longDescElement.innerHTML).not.toContain('evilimageurl');
         });
 
         httpBackend
@@ -308,7 +308,7 @@ describe('GroupView', function() {
         const prom = waitForUpdate(groupView, 4).then(() => {
             const roomDetailList = ReactTestUtils.findRenderedDOMComponentWithClass(root, 'mx_RoomDetailList');
             const roomDetailListElement = ReactDOM.findDOMNode(roomDetailList);
-            expect(roomDetailListElement).toExist();
+            expect(roomDetailListElement).toBeTruthy();
         });
 
         httpBackend.when('GET', '/groups/' + groupIdEncoded + '/summary').respond(200, summaryResponse);
@@ -325,7 +325,7 @@ describe('GroupView', function() {
         const prom = waitForUpdate(groupView, 4).then(() => {
             const roomDetailList = ReactTestUtils.findRenderedDOMComponentWithClass(root, 'mx_RoomDetailList');
             const roomDetailListElement = ReactDOM.findDOMNode(roomDetailList);
-            expect(roomDetailListElement).toExist();
+            expect(roomDetailListElement).toBeTruthy();
 
             const roomDetailListRoomName = ReactTestUtils.findRenderedDOMComponentWithClass(
                 root,
@@ -333,7 +333,7 @@ describe('GroupView', function() {
             );
             const roomDetailListRoomNameElement = ReactDOM.findDOMNode(roomDetailListRoomName);
 
-            expect(roomDetailListRoomNameElement).toExist();
+            expect(roomDetailListRoomNameElement).toBeTruthy();
             expect(roomDetailListRoomNameElement.innerText).toEqual('Some room name');
         });
 
@@ -364,7 +364,7 @@ describe('GroupView', function() {
         const prom = waitForUpdate(groupView, 3).then(() => {
             const shortDesc = ReactTestUtils.findRenderedDOMComponentWithClass(root, 'mx_GroupView_header_shortDesc');
             const shortDescElement = ReactDOM.findDOMNode(shortDesc);
-            expect(shortDescElement).toExist();
+            expect(shortDescElement).toBeTruthy();
             expect(shortDescElement.innerText).toBe('This is a community');
         });
 
diff --git a/test/components/views/dialogs/InteractiveAuthDialog-test.js b/test/components/views/dialogs/InteractiveAuthDialog-test.js
index 36894fbd21..88d1c804ca 100644
--- a/test/components/views/dialogs/InteractiveAuthDialog-test.js
+++ b/test/components/views/dialogs/InteractiveAuthDialog-test.js
@@ -83,8 +83,8 @@ describe('InteractiveAuthDialog', function() {
                     submitNode = node;
                 }
             }
-            expect(passwordNode).toExist();
-            expect(submitNode).toExist();
+            expect(passwordNode).toBeTruthy();
+            expect(submitNode).toBeTruthy();
 
             // submit should be disabled
             expect(submitNode.disabled).toBe(true);
diff --git a/test/components/views/groups/GroupMemberList-test.js b/test/components/views/groups/GroupMemberList-test.js
index d71d0377d7..3922610644 100644
--- a/test/components/views/groups/GroupMemberList-test.js
+++ b/test/components/views/groups/GroupMemberList-test.js
@@ -114,7 +114,7 @@ describe("GroupMemberList", function() {
 
             const memberList = ReactTestUtils.findRenderedDOMComponentWithClass(root, "mx_MemberList_joined");
             const memberListElement = ReactDOM.findDOMNode(memberList);
-            expect(memberListElement).toExist();
+            expect(memberListElement).toBeTruthy();
             expect(memberListElement.innerText).toBe("Test");
         });
 
@@ -134,7 +134,7 @@ describe("GroupMemberList", function() {
 
             const memberList = ReactTestUtils.findRenderedDOMComponentWithClass(root, "mx_MemberList_joined");
             const memberListElement = ReactDOM.findDOMNode(memberList);
-            expect(memberListElement).toExist();
+            expect(memberListElement).toBeTruthy();
             expect(memberListElement.innerText).toBe("Failed to load group members");
         });
 
diff --git a/test/components/views/rooms/RoomList-test.js b/test/components/views/rooms/RoomList-test.js
index e512b96ba8..0c970edb0b 100644
--- a/test/components/views/rooms/RoomList-test.js
+++ b/test/components/views/rooms/RoomList-test.js
@@ -69,7 +69,7 @@ describe('RoomList', () => {
         ReactTestUtils.findRenderedComponentWithType(root, RoomList);
 
         movingRoom = createRoom({name: 'Moving room'});
-        expect(movingRoom.roomId).toNotBe(null);
+        expect(movingRoom.roomId).not.toBe(null);
 
         // Mock joined member
         myMember = new RoomMember(movingRoomId, myUserId);
@@ -139,7 +139,7 @@ describe('RoomList', () => {
             throw err;
         }
 
-        expect(expectedRoomTile).toExist();
+        expect(expectedRoomTile).toBeTruthy();
         expect(expectedRoomTile.props.room).toBe(room);
     }
 
diff --git a/test/matrix-to-test.js b/test/matrix-to-test.js
index 6392e326e9..26bd3b1a96 100644
--- a/test/matrix-to-test.js
+++ b/test/matrix-to-test.js
@@ -39,7 +39,7 @@ describe('matrix-to', function() {
     it('should pick no candidate servers when the room is not found', function() {
         peg.get().getRoom = () => null;
         const pickedServers = pickServerCandidates("!somewhere:example.org");
-        expect(pickedServers).toExist();
+        expect(pickedServers).toBeTruthy();
         expect(pickedServers.length).toBe(0);
     });
 
@@ -50,7 +50,7 @@ describe('matrix-to', function() {
             };
         };
         const pickedServers = pickServerCandidates("!somewhere:example.org");
-        expect(pickedServers).toExist();
+        expect(pickedServers).toBeTruthy();
         expect(pickedServers.length).toBe(0);
     });
 
@@ -74,7 +74,7 @@ describe('matrix-to', function() {
             };
         };
         const pickedServers = pickServerCandidates("!somewhere:example.org");
-        expect(pickedServers).toExist();
+        expect(pickedServers).toBeTruthy();
         expect(pickedServers.length).toBe(3);
         expect(pickedServers[0]).toBe("pl_95");
         // we don't check the 2nd and 3rd servers because that is done by the next test
@@ -112,7 +112,7 @@ describe('matrix-to', function() {
             };
         };
         const pickedServers = pickServerCandidates("!somewhere:example.org");
-        expect(pickedServers).toExist();
+        expect(pickedServers).toBeTruthy();
         expect(pickedServers.length).toBe(3);
         expect(pickedServers[0]).toBe("first");
         expect(pickedServers[1]).toBe("second");
@@ -143,7 +143,7 @@ describe('matrix-to', function() {
             };
         };
         const pickedServers = pickServerCandidates("!somewhere:example.org");
-        expect(pickedServers).toExist();
+        expect(pickedServers).toBeTruthy();
         expect(pickedServers.length).toBe(3);
         expect(pickedServers[0]).toBe("first");
         expect(pickedServers[1]).toBe("second");
@@ -178,7 +178,7 @@ describe('matrix-to', function() {
             };
         };
         const pickedServers = pickServerCandidates("!somewhere:example.org");
-        expect(pickedServers).toExist();
+        expect(pickedServers).toBeTruthy();
         expect(pickedServers.length).toBe(3);
     });
 
@@ -194,7 +194,7 @@ describe('matrix-to', function() {
             };
         };
         const pickedServers = pickServerCandidates("!somewhere:example.org");
-        expect(pickedServers).toExist();
+        expect(pickedServers).toBeTruthy();
         expect(pickedServers.length).toBe(0);
     });
 
@@ -210,7 +210,7 @@ describe('matrix-to', function() {
             };
         };
         const pickedServers = pickServerCandidates("!somewhere:example.org");
-        expect(pickedServers).toExist();
+        expect(pickedServers).toBeTruthy();
         expect(pickedServers.length).toBe(0);
     });
 
@@ -226,7 +226,7 @@ describe('matrix-to', function() {
             };
         };
         const pickedServers = pickServerCandidates("!somewhere:example.org");
-        expect(pickedServers).toExist();
+        expect(pickedServers).toBeTruthy();
         expect(pickedServers.length).toBe(0);
     });
 
@@ -242,7 +242,7 @@ describe('matrix-to', function() {
             };
         };
         const pickedServers = pickServerCandidates("!somewhere:example.org");
-        expect(pickedServers).toExist();
+        expect(pickedServers).toBeTruthy();
         expect(pickedServers.length).toBe(0);
     });
 
@@ -258,7 +258,7 @@ describe('matrix-to', function() {
             };
         };
         const pickedServers = pickServerCandidates("!somewhere:example.org");
-        expect(pickedServers).toExist();
+        expect(pickedServers).toBeTruthy();
         expect(pickedServers.length).toBe(1);
         expect(pickedServers[0]).toBe("example.org:8448");
     });
@@ -292,7 +292,7 @@ describe('matrix-to', function() {
             };
         };
         const pickedServers = pickServerCandidates("!somewhere:example.org");
-        expect(pickedServers).toExist();
+        expect(pickedServers).toBeTruthy();
         expect(pickedServers.length).toBe(0);
     });
 
@@ -325,7 +325,7 @@ describe('matrix-to', function() {
             };
         };
         const pickedServers = pickServerCandidates("!somewhere:example.org");
-        expect(pickedServers).toExist();
+        expect(pickedServers).toBeTruthy();
         expect(pickedServers.length).toBe(0);
     });
 
@@ -358,7 +358,7 @@ describe('matrix-to', function() {
             };
         };
         const pickedServers = pickServerCandidates("!somewhere:example.org");
-        expect(pickedServers).toExist();
+        expect(pickedServers).toBeTruthy();
         expect(pickedServers.length).toBe(1);
         expect(pickedServers[0]).toEqual("evilcorp.com");
     });
@@ -392,7 +392,7 @@ describe('matrix-to', function() {
             };
         };
         const pickedServers = pickServerCandidates("!somewhere:example.org");
-        expect(pickedServers).toExist();
+        expect(pickedServers).toBeTruthy();
         expect(pickedServers.length).toBe(1);
         expect(pickedServers[0]).toEqual("evilcorp.com");
     });