Blueberry Spinach Salad

I received this recipe from a co-worker's wife and it's become one of my favorites. The addition of blueberries gives this salad a different twist.

INGREDIENTS
1/2 cup vegetable oil
1/4 cup raspberry vinegar
2 teaspoons Dijon mustard
1 teaspoon sugar
1/2 teaspoon salt
1 (10 ounce) package fresh spinach, torn
1 (4 ounce) package blue cheese, crumbled I like feta better
1 cup fresh blueberries
1/2 cup chopped pecans, toasted

DIRECTIONS
In a jar with tight-fitting lid, combine the first five ingredients and shake well. In a large salad bowl, toss the spinach, blue cheese, blueberries and pecans. Add dressing and toss gently; serve immediately.