Cook the pasta in a large pot of boiling salted water until al dente.
Meanwhile, combine tomatoes and beans in a large non-stick skillet. Bring to a boil over medium high heat. Reduce heat, and simmer 10 minutes.
Add spinach to the sauce; cook for 2 minutes or until spinach wilts, stirring constantly.
Serve sauce over pasta, and sprinkle with feta.
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