Format (#257)

* Add Rustfmt

* Add Taplo

src/tests/mock_rng.rs

@@ -6,22 +6,21 @@
 // of this source tree.
 
 use core::cmp::min;
-use rand::{CryptoRng, Error, RngCore};
 use std::vec::Vec;
 
+use rand::{CryptoRng, Error, RngCore};
+
 /// A simple implementation of `RngCore` for testing purposes.
 ///
 /// This generates a cyclic sequence (i.e. cycles over an initial buffer)
-///
-///
 #[derive(Clone, Debug)]
 pub struct CycleRng {
     v: Vec<u8>,
 }
 
 impl CycleRng {
-    /// Create a `CycleRng`, yielding a sequence starting with
-    /// `initial` and looping thereafter
+    /// Create a `CycleRng`, yielding a sequence starting with `initial` and
+    /// looping thereafter
     pub fn new(initial: Vec<u8>) -> Self {
         CycleRng { v: initial }
     }