housekeeping: add test against overzealous prefix-stripping in error …

…paths (via swagger-api#1925)

* housekeeping: add failing test

* remove exclusive test method

test/unit/plugins/validate-semantic/2and3/paths.js

@@ -354,6 +354,37 @@ describe("validation plugin - semantic - 2and3 paths", () => {
         })
 
         it("should return one error when no parameters are defined", function(){
+          const spec = {
+            swagger: "2.0",
+            info: {
+              title: "test",
+              version: "1.0.0"
+            },
+            paths: {
+              "/{12345instanceABCDE_instance_12345}": {
+                get: {
+                  responses: {
+                    "200": {
+                      description: "ok"
+                    }
+                  }
+                }
+              }
+            }
+          }
+
+          return validateHelper(spec)
+          .then(system => {
+            const allErrors = system.errSelectors.allErrors().toJS()
+            const firstError = allErrors[0]
+            expect(allErrors.length).toEqual(1)
+            expect(firstError.message).toEqual( "Declared path parameter \"12345instanceABCDE_instance_12345\" needs to be defined as a path parameter at either the path or operation level")
+            expect(firstError.path).toEqual(["paths", "/{12345instanceABCDE_instance_12345}"])
+          })
+
+        })
+
+        it("should return a well-formed error when ", function(){
           const spec = {
             swagger: "2.0",
             paths: {