Example (#4730)

* add tests for example feature
* refactor ParameterRow value setter logic
* aside: fix property access in sampleFromSchema
* prioritize media type examples for OAS3 responses
* use `example` in schema level example
* refactor: move stringify to utils
* prioritize media type examples in OAS3 request bodies
* modify nightwatch config
* fix parameter/response regressions
* reorder and broaden default value sources
* update lockfile

test/bugs/4557-default-parameter-values.js

@@ -19,7 +19,8 @@ describe("bug #4557: default parameter values", function(){
       specSelectors: {
         security(){},
         parameterWithMetaByIdentity(){ return paramValue },
-        isOAS3(){ return false }
+        isOAS3(){ return false },
+        isSwagger2(){ return true }
       },
       fn: {},
       operation: {get: ()=>{}},
@@ -52,7 +53,8 @@ describe("bug #4557: default parameter values", function(){
       specSelectors: {
         security(){},
         parameterWithMetaByIdentity(){ return paramValue },
-        isOAS3(){ return true }
+        isOAS3(){ return true },
+        isSwagger2() { return false }
       },
       fn: {},
       operation: {get: ()=>{}},