fix test case for 0-0 input case in test_and_gate (#119)

garble/mpz-garble-core/src/lib.rs

@@ -97,7 +97,7 @@ mod tests {
         let (z_0, encrypted_gate) = gen::and_gate(cipher, &x_0, &y_0, &delta, gid);
         let z_1 = z_0 ^ delta;
 
-        assert_eq!(ev::and_gate(cipher, &x_0, &y_1, &encrypted_gate, gid), z_0);
+        assert_eq!(ev::and_gate(cipher, &x_0, &y_0, &encrypted_gate, gid), z_0);
         assert_eq!(ev::and_gate(cipher, &x_0, &y_1, &encrypted_gate, gid), z_0);
         assert_eq!(ev::and_gate(cipher, &x_1, &y_0, &encrypted_gate, gid), z_0);
         assert_eq!(ev::and_gate(cipher, &x_1, &y_1, &encrypted_gate, gid), z_1);