Improve path checking before route registration (#155)

* [147] Ensure path sanity checks provide clear errors during registration checks

* [147] Adjust tests to not include unused variables

* [147] Adjust usage of double quotes to single quotes to ensure code style

* [147] Adjust gh-148 to gh-147 mention in tests

* [147] Remove extraneous parameters in test functions, ensure all possible method verbs are tested

lib/router.js

@@ -189,17 +189,22 @@ function Router(opts) {
 for (let i = 0; i < methods.length; i++) {
   function setMethodVerb(method) {
     Router.prototype[method] = function(name, path, middleware) {
-      if (typeof path === "string" || path instanceof RegExp) {
+      if (typeof path === 'string' || path instanceof RegExp) {
         middleware = Array.prototype.slice.call(arguments, 2);
       } else {
         middleware = Array.prototype.slice.call(arguments, 1);
         path = name;
         name = null;
       }
 
-      this.register(path, [method], middleware, {
-        name: name
-      });
+      // Sanity check to ensure we have a viable path candidate (eg: string|regex|non-empty array)
+      if (
+        typeof path !== 'string' &&
+        !(path instanceof RegExp) && 
+        (!Array.isArray(path) || path.length === 0)
+      ) throw new Error(`You have to provide a path when adding a ${method} handler`);
+
+      this.register(path, [method], middleware, {name});
 
       return this;
     };
@@ -498,7 +503,14 @@ Router.prototype.all = function (name, path, middleware) {
     name = null;
   }
 
-  this.register(path, methods, middleware, { name });
+  // Sanity check to ensure we have a viable path candidate (eg: string|regex|non-empty array)
+  if (
+    typeof path !== 'string' &&
+    !(path instanceof RegExp) && 
+    (!Array.isArray(path) || path.length === 0)
+  ) throw new Error('You have to provide a path when adding an all handler');
+
+  this.register(path, methods, middleware, {name});
 
   return this;
 };
@@ -572,7 +584,7 @@ Router.prototype.register = function (path, methods, middleware, opts) {
     name: opts.name,
     sensitive: opts.sensitive || this.opts.sensitive || false,
     strict: opts.strict || this.opts.strict || false,
-    prefix: opts.prefix || this.opts.prefix || "",
+    prefix: opts.prefix || this.opts.prefix || '',
     ignoreCaptures: opts.ignoreCaptures
   });
 

test/lib/router.js

@@ -993,7 +993,26 @@ describe('Router', function () {
           done();
         });
     });
+
+    it ('correctly returns an error when not passed a path for verb-specific registration (gh-147)', function () {
+      const router = new Router();
+      for (let el of methods) {
+          try {
+            router[el](function () {});
+          } catch (e) {
+            expect(e.message).to.be(`You have to provide a path when adding a ${el} handler`);
+          }
+      }
+    });
 
+    it ('correctly returns an error when not passed a path for "all" registration (gh-147)', function () {
+      const router = new Router();
+      try {
+        router.all(function () {});
+      } catch (e) {
+        expect(e.message).to.be('You have to provide a path when adding an all handler');
+      }
+    });
   });
 
   describe('Router#use()', function () {