Fill a large pot halfway with water and heat over high heat until boiling.
Add pasta and cook for 9 minutes, or until tender.
While pasta is cooking, cut tomatoes in half, and chop basil.
Strain pasta and rinse well with cold water. Pour into a large bowl.
In a small bowl, mix olive oil, mustard, garlic, salt, and pepper.
Add dressing mixture to pasta and stir well.
Add tomatoes, feta, and basil to pasta, and toss to combine.
Chill for 1 hour before serving.