restructured contexts in mitm tests

integrationtests/self/mitm_test.go

@@ -72,6 +72,7 @@ var _ = Describe("MITM test", func() {
 				Expect(err).ToNot(HaveOccurred())
 			})
 
+			Context("unsuccessful attacks", func() {
 				AfterEach(func() {
 					Eventually(serverSess.Context().Done()).Should(BeClosed())
 					// Test shutdown is tricky due to the proxy. Just wait for a bit.
@@ -266,5 +267,10 @@ var _ = Describe("MITM test", func() {
 					})
 				})
 			})
+
+			Context("successful injection attacks", func() {
+				// TODO(tatianab): add successful injection attacks
+			})
+		})
 	}
 })