Added User password_reset spec and some refactor

*Make returned error in errors array
*Use constants

spec/controllers/api/users_controller_spec.rb

@@ -0,0 +1,72 @@
+require 'spec_helper'
+
+describe Api::V1::UsersController do
+
+  describe "#password_reset" do
+
+    context "as a user" do
+      before(:each) do
+        @user = FactoryGirl.create(:user)
+        sign_in @user
+      end
+
+      it "returns 403" do
+        post :password_reset
+        expect(@response.code.to_i).to eql 403
+      end
+
+      it "returns an error message" do
+        post :password_reset
+        json = JSON.parse(@response.body)
+        expect(json["errors"].first).to eql Api::V1::UsersController::CANNOT_MANAGE
+      end
+
+    end
+
+    context "as an admin" do
+      before(:each) do
+        @user = FactoryGirl.create(:admin)
+        sign_in @user
+      end
+
+      it "forbids a user to reset their own password" do
+        post :password_reset, user_id: @user.id
+        expect(@response.code.to_i).to eql 403
+        json = JSON.parse(@response.body)
+        expect(json["errors"].first).to eql Api::V1::UsersController::NOT_ALLOWED
+      end
+
+      context "with no user in json data" do
+        it "returns 404" do
+          post :password_reset
+          expect(@response.code.to_i).to eql 404
+        end
+
+        it "returns an error message" do
+          post :password_reset
+          json = JSON.parse(@response.body)
+          expect(json["errors"].first).to eql Api::V1::UsersController::NOT_FOUND
+        end
+      end
+
+      context "another user exists" do
+        before(:each) do
+          @user2 = FactoryGirl.create(:user)
+        end
+
+        it "returns 200" do
+          post :password_reset, user_id: @user2.id
+          expect(@response.code.to_i).to eql 200
+        end
+
+        it "returns that users new password" do
+          post :password_reset, user_id: @user2.id
+          json = JSON.parse(@response.body)
+          expect(json["password"].length).to eql Api::V1::UsersController::PASS_LENGTH
+        end
+
+      end
+
+    end
+  end
+end