Upgrade referee to v3

package.json

@@ -65,7 +65,7 @@
   },
   "devDependencies": {
     "@babel/core": "^7.1.6",
-    "@sinonjs/referee": "^2.5.2",
+    "@sinonjs/referee": "^3.0.0",
     "babel-plugin-istanbul": "^5.1.0",
     "babelify": "^10.0.0",
     "browserify": "^16.2.3",

test/sandbox-test.js

@@ -31,7 +31,8 @@ referee.add("fakeServerWithClock", {
     assert: function(obj, expected) {
         return samsam.deepEqual(obj, expected) && fakeServer.create.calledOn(fakeServerWithClock);
     },
-    assertMessage: "Expected object ${0} to be a fake server with clock"
+    assertMessage: "Expected object ${0} to be a fake server with clock",
+    refuteMessage: "Expected object ${0} not to be a fake server with clock"
 });
 
 describe("Sandbox", function() {

test/test-helper.js

@@ -6,21 +6,24 @@ referee.add("spy", {
     assert: function(obj) {
         return obj !== null && typeof obj.calledWith === "function" && !obj.returns;
     },
-    assertMessage: "Expected object ${0} to be a spy function"
+    assertMessage: "Expected object ${0} to be a spy function",
+    refuteMessage: "Expected object ${0} not to be a spy function"
 });
 
 referee.add("stub", {
     assert: function(obj) {
         return obj !== null && typeof obj.calledWith === "function" && typeof obj.returns === "function";
     },
-    assertMessage: "Expected object ${0} to be a stub function"
+    assertMessage: "Expected object ${0} to be a stub function",
+    refuteMessage: "Expected object ${0} not to be a stub function"
 });
 
 referee.add("mock", {
     assert: function(obj) {
         return obj !== null && typeof obj.verify === "function" && typeof obj.expects === "function";
     },
-    assertMessage: "Expected object ${0} to be a mock"
+    assertMessage: "Expected object ${0} to be a mock",
+    refuteMessage: "Expected object ${0} not to be a mock"
 });
 
 referee.add("fakeServer", {
@@ -31,12 +34,14 @@ referee.add("fakeServer", {
             typeof obj.respondWith === "function"
         );
     },
-    assertMessage: "Expected object ${0} to be a fake server"
+    assertMessage: "Expected object ${0} to be a fake server",
+    refuteMessage: "Expected object ${0} not to be a fake server"
 });
 
 referee.add("clock", {
     assert: function(obj) {
         return obj !== null && typeof obj.tick === "function" && typeof obj.setTimeout === "function";
     },
-    assertMessage: "Expected object ${0} to be a clock"
+    assertMessage: "Expected object ${0} to be a clock",
+    refuteMessage: "Expected object ${0} not to be a clock"
 });