Update ui tests and add rustfix

Author: HarrisonMc555

tests/ui/get_last_with_len.fixed

@@ -0,0 +1,31 @@
+// run-rustfix
+
+#![warn(clippy::get_last_with_len)]
+
+fn dont_use_last() {
+    let x = vec![2, 3, 5];
+    let _ = x.last(); // ~ERROR Use x.last()
+}
+
+fn indexing_two_from_end() {
+    let x = vec![2, 3, 5];
+    let _ = x.get(x.len() - 2);
+}
+
+fn index_into_last() {
+    let x = vec![2, 3, 5];
+    let _ = x[x.len() - 1];
+}
+
+fn use_last_with_different_vec_length() {
+    let x = vec![2, 3, 5];
+    let y = vec!['a', 'b', 'c'];
+    let _ = x.get(y.len() - 1);
+}
+
+fn main() {
+    dont_use_last();
+    indexing_two_from_end();
+    index_into_last();
+    use_last_with_different_vec_length();
+}

tests/ui/get_last_with_len.rs

@@ -1,3 +1,5 @@
+// run-rustfix
+
 #![warn(clippy::get_last_with_len)]
 
 fn dont_use_last() {

tests/ui/get_last_with_len.stderr

@@ -1,10 +1,10 @@
-error: unknown clippy lint: clippy::get_last_with_len
-  --> $DIR/get_last_with_len.rs:1:9
+error: Use `x.last()` instead of `x.get(x.len() - 1)`
+  --> $DIR/get_last_with_len.rs:7:13
    |
-LL | #![warn(clippy::get_last_with_len)]
-   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     let _ = x.get(x.len() - 1); // ~ERROR Use x.last()
+   |             ^^^^^^^^^^^^^^^^^^ help: try: `x.last()`
    |
-   = note: `-D clippy::unknown-clippy-lints` implied by `-D warnings`
+   = note: `-D clippy::get-last-with-len` implied by `-D warnings`
 
 error: aborting due to previous error