What is the test for a motion to dismiss an action for improper venue?

Federal Rule of Civil Procedure 12(b)(3) allows a defendant to move to dismiss an action for improper venue. On a Rule 12(b)(3) motion, "the pleadings need not be accepted as true, and the court may consider facts outside of the pleadings," but the court must draw all reasonable inferences and resolve all factual conflicts in favor of the non-moving party. Murphy v. Schneider Nat'l, Inc., 362 F.3d 1133, 1137 (9th Cir. 2004).

Under 28 U.S.C. 1391(b),

28 U.S.C. 1391(b).