initialize mainPage variable (for linter)

test/e2e/scenarios/models.js

@@ -1,5 +1,5 @@
 describe("Render Model Wrapper", function () {
-    let modelWrapper
+    let modelWrapper, mainPage
 
     beforeEach(function (client, done) {
         mainPage = client
@@ -37,7 +37,7 @@ describe("Render Model Wrapper", function () {
         modelWrapper.waitForElementVisible("@orderModel")
             .click("@orderModelCallapse")
             .assert.cssClassNotPresent("@orderModelCallapse", "callapsed")
-        
+
         client.end()
     })
 
@@ -45,35 +45,35 @@ describe("Render Model Wrapper", function () {
         modelWrapper.waitForElementVisible("@categoryModel")
             .click("@categoryModelCallapse")
             .assert.cssClassNotPresent("@categoryModelCallapse", "callapsed")
-        
+
         client.end()
     })
     it("Testing user model", function(client){
         modelWrapper.waitForElementVisible("@userModel")
             .click("@userModelCallapse")
             .assert.cssClassNotPresent("@userModelCallapse", "callapsed")
-        
+
         client.end()
     })
     it("Testing tag model", function(client){
         modelWrapper.waitForElementVisible("@tagModel")
             .click("@tagModelCallapse")
             .assert.cssClassNotPresent("@tagModelCallapse", "callapsed")
-        
+
         client.end()
     })
     it("Testing pet model", function(client){
         modelWrapper.waitForElementVisible("@petModel")
             .click("@petModelCallapse")
             .assert.cssClassNotPresent("@petModelCallapse", "callapsed")
-        
+
         client.end()
     })
     it("Testing apiResponse model", function(client){
         modelWrapper.waitForElementVisible("@apiResponseModel")
             .click("@apiResponseModelCallapse")
             .assert.cssClassNotPresent("@apiResponseModelCallapse", "callapsed")
-        
+
         client.end()
     })
-})
+})