Add more workouts functionality and tests

app/controllers/workouts_controller.rb

@@ -10,4 +10,37 @@ class WorkoutsController < ApplicationController
   def edit
     @workout = Workout.find(params[:id])
   end
+
+  def update
+    params.permit!
+    @workout = Workout.find(params[:id])
+
+    if @workout.update_attributes(params[:workout])
+      redirect_to @workout, notice: 'Workout updated'
+    else
+      render action: 'edit'
+    end
+  end
+
+  def new
+    @workout = Workout.new
+  end
+
+  def create
+    params.permit!
+    @workout = Workout.new(params[:workout])
+
+    if @workout.save
+      redirect_to @workout, notice: 'Workout created'
+    else
+      render action: 'new'
+    end
+  end
+
+  def destroy
+    @workout = Workout.find(params[:id])
+    @workout.destroy
+
+    redirect_to workouts_url, notice: 'Workout deleted'
+  end
 end