Add run-rustfix for int_plus_one test

tests/ui/int_plus_one.fixed

@@ -0,0 +1,17 @@
+// run-rustfix
+
+#[allow(clippy::no_effect, clippy::unnecessary_operation)]
+#[warn(clippy::int_plus_one)]
+fn main() {
+    let x = 1i32;
+    let y = 0i32;
+
+    let _ = x > y;
+    let _ = y < x;
+
+    let _ = x > y;
+    let _ = y < x;
+
+    let _ = x > y; // should be ok
+    let _ = y < x; // should be ok
+}

tests/ui/int_plus_one.rs

@@ -1,15 +1,17 @@
+// run-rustfix
+
 #[allow(clippy::no_effect, clippy::unnecessary_operation)]
 #[warn(clippy::int_plus_one)]
 fn main() {
     let x = 1i32;
     let y = 0i32;
 
-    x >= y + 1;
+    let _ = x >= y + 1;
-    y + 1 <= x;
+    let _ = y + 1 <= x;
 
-    x - 1 >= y;
+    let _ = x - 1 >= y;
-    y <= x - 1;
+    let _ = y <= x - 1;
 
-    x > y; // should be ok
+    let _ = x > y; // should be ok
-    y < x; // should be ok
+    let _ = y < x; // should be ok
 }

tests/ui/int_plus_one.stderr

@@ -1,43 +1,43 @@
 error: Unnecessary `>= y + 1` or `x - 1 >=`
-  --> $DIR/int_plus_one.rs:7:5
+  --> $DIR/int_plus_one.rs:9:13
    |
-LL |     x >= y + 1;
+LL |     let _ = x >= y + 1;
    |             ^^^^^^^^^^
    |
    = note: `-D clippy::int-plus-one` implied by `-D warnings`
 help: change `>= y + 1` to `> y` as shown
    |
-LL |     x > y;
+LL |     let _ = x > y;
    |             ^^^^^
 
 error: Unnecessary `>= y + 1` or `x - 1 >=`
-  --> $DIR/int_plus_one.rs:8:5
+  --> $DIR/int_plus_one.rs:10:13
    |
-LL |     y + 1 <= x;
+LL |     let _ = y + 1 <= x;
    |             ^^^^^^^^^^
 help: change `>= y + 1` to `> y` as shown
    |
-LL |     y < x;
+LL |     let _ = y < x;
    |             ^^^^^
 
 error: Unnecessary `>= y + 1` or `x - 1 >=`
-  --> $DIR/int_plus_one.rs:10:5
+  --> $DIR/int_plus_one.rs:12:13
    |
-LL |     x - 1 >= y;
+LL |     let _ = x - 1 >= y;
    |             ^^^^^^^^^^
 help: change `>= y + 1` to `> y` as shown
    |
-LL |     x > y;
+LL |     let _ = x > y;
    |             ^^^^^
 
 error: Unnecessary `>= y + 1` or `x - 1 >=`
-  --> $DIR/int_plus_one.rs:11:5
+  --> $DIR/int_plus_one.rs:13:13
    |
-LL |     y <= x - 1;
+LL |     let _ = y <= x - 1;
    |             ^^^^^^^^^^
 help: change `>= y + 1` to `> y` as shown
    |
-LL |     y < x;
+LL |     let _ = y < x;
    |             ^^^^^
 
 error: aborting due to 4 previous errors