Add test

clippy_utils/src/sugg.rs

@@ -1040,4 +1040,37 @@ fn binop_maybe_par() {
         let sugg = Sugg::BinOp(AssocOp::Add, "(1 + 1) + (1 + 1)".into());
         assert_eq!("((1 + 1) + (1 + 1))", sugg.maybe_par().to_string());
     }
+    #[test]
+    fn not_op() {
+        use AssocOp::{Add, Equal, Greater, GreaterEqual, LAnd, LOr, Less, LessEqual, NotEqual};
+
+        // Invert the comparison operator.
+        let sugg = Sugg::BinOp(Equal, "1 == 1".into());
+        assert_eq!("1 != 1", (!sugg).to_string());
+
+        let sugg = Sugg::BinOp(NotEqual, "1 != 1".into());
+        assert_eq!("1 == 1", (!sugg).to_string());
+
+        let sugg = Sugg::BinOp(Less, "1 < 1".into());
+        assert_eq!("1 >= 1", (!sugg).to_string());
+
+        let sugg = Sugg::BinOp(LessEqual, "1 <= 1".into());
+        assert_eq!("1 > 1", (!sugg).to_string());
+
+        let sugg = Sugg::BinOp(Greater, "1 > 1".into());
+        assert_eq!("1 <= 1", (!sugg).to_string());
+
+        let sugg = Sugg::BinOp(GreaterEqual, "1 >= 1".into());
+        assert_eq!("1 < 1", (!sugg).to_string());
+
+        // Other operators are inverted like !(..).
+        let sugg = Sugg::BinOp(Add, "1 + 1".into());
+        assert_eq!("!(1 + 1)", (!sugg).to_string());
+
+        let sugg = Sugg::BinOp(LAnd, "1 && 1".into());
+        assert_eq!("!(1 && 1)", (!sugg).to_string());
+
+        let sugg = Sugg::BinOp(LOr, "1 || 1".into());
+        assert_eq!("!(1 || 1)", (!sugg).to_string());
+    }
 }

tests/ui/needless_bool/fixable.fixed

@@ -41,6 +41,15 @@ fn main() {
     x;
     !x;
     !(x && y);
+    let a = 0;
+    let b = 1;
+
+    a != b;
+    a == b;
+    a >= b;
+    a > b;
+    a <= b;
+    a < b;
     if x {
         x
     } else {

tests/ui/needless_bool/fixable.rs

@@ -53,6 +53,39 @@ fn main() {
     } else {
         true
     };
+    let a = 0;
+    let b = 1;
+
+    if a == b {
+        false
+    } else {
+        true
+    };
+    if a != b {
+        false
+    } else {
+        true
+    };
+    if a < b {
+        false
+    } else {
+        true
+    };
+    if a <= b {
+        false
+    } else {
+        true
+    };
+    if a > b {
+        false
+    } else {
+        true
+    };
+    if a >= b {
+        false
+    } else {
+        true
+    };
     if x {
         x
     } else {

tests/ui/needless_bool/fixable.stderr

@@ -31,7 +31,67 @@ LL | |     };
    | |_____^ help: you can reduce it to: `!(x && y)`
 
 error: this if-then-else expression returns a bool literal
-  --> $DIR/fixable.rs:72:5
+  --> $DIR/fixable.rs:59:5
+   |
+LL | /     if a == b {
+LL | |         false
+LL | |     } else {
+LL | |         true
+LL | |     };
+   | |_____^ help: you can reduce it to: `a != b`
+
+error: this if-then-else expression returns a bool literal
+  --> $DIR/fixable.rs:64:5
+   |
+LL | /     if a != b {
+LL | |         false
+LL | |     } else {
+LL | |         true
+LL | |     };
+   | |_____^ help: you can reduce it to: `a == b`
+
+error: this if-then-else expression returns a bool literal
+  --> $DIR/fixable.rs:69:5
+   |
+LL | /     if a < b {
+LL | |         false
+LL | |     } else {
+LL | |         true
+LL | |     };
+   | |_____^ help: you can reduce it to: `a >= b`
+
+error: this if-then-else expression returns a bool literal
+  --> $DIR/fixable.rs:74:5
+   |
+LL | /     if a <= b {
+LL | |         false
+LL | |     } else {
+LL | |         true
+LL | |     };
+   | |_____^ help: you can reduce it to: `a > b`
+
+error: this if-then-else expression returns a bool literal
+  --> $DIR/fixable.rs:79:5
+   |
+LL | /     if a > b {
+LL | |         false
+LL | |     } else {
+LL | |         true
+LL | |     };
+   | |_____^ help: you can reduce it to: `a <= b`
+
+error: this if-then-else expression returns a bool literal
+  --> $DIR/fixable.rs:84:5
+   |
+LL | /     if a >= b {
+LL | |         false
+LL | |     } else {
+LL | |         true
+LL | |     };
+   | |_____^ help: you can reduce it to: `a < b`
+
+error: this if-then-else expression returns a bool literal
+  --> $DIR/fixable.rs:105:5
    |
 LL | /     if x {
 LL | |         return true;
@@ -41,7 +101,7 @@ LL | |     };
    | |_____^ help: you can reduce it to: `return x`
 
 error: this if-then-else expression returns a bool literal
-  --> $DIR/fixable.rs:80:5
+  --> $DIR/fixable.rs:113:5
    |
 LL | /     if x {
 LL | |         return false;
@@ -51,7 +111,7 @@ LL | |     };
    | |_____^ help: you can reduce it to: `return !x`
 
 error: this if-then-else expression returns a bool literal
-  --> $DIR/fixable.rs:88:5
+  --> $DIR/fixable.rs:121:5
    |
 LL | /     if x && y {
 LL | |         return true;
@@ -61,7 +121,7 @@ LL | |     };
    | |_____^ help: you can reduce it to: `return x && y`
 
 error: this if-then-else expression returns a bool literal
-  --> $DIR/fixable.rs:96:5
+  --> $DIR/fixable.rs:129:5
    |
 LL | /     if x && y {
 LL | |         return false;
@@ -71,7 +131,7 @@ LL | |     };
    | |_____^ help: you can reduce it to: `return !(x && y)`
 
 error: equality checks against true are unnecessary
-  --> $DIR/fixable.rs:104:8
+  --> $DIR/fixable.rs:137:8
    |
 LL |     if x == true {};
    |        ^^^^^^^^^ help: try simplifying it as shown: `x`
@@ -79,25 +139,25 @@ LL |     if x == true {};
    = note: `-D clippy::bool-comparison` implied by `-D warnings`
 
 error: equality checks against false can be replaced by a negation
-  --> $DIR/fixable.rs:108:8
+  --> $DIR/fixable.rs:141:8
    |
 LL |     if x == false {};
    |        ^^^^^^^^^^ help: try simplifying it as shown: `!x`
 
 error: equality checks against true are unnecessary
-  --> $DIR/fixable.rs:118:8
+  --> $DIR/fixable.rs:151:8
    |
 LL |     if x == true {};
    |        ^^^^^^^^^ help: try simplifying it as shown: `x`
 
 error: equality checks against false can be replaced by a negation
-  --> $DIR/fixable.rs:119:8
+  --> $DIR/fixable.rs:152:8
    |
 LL |     if x == false {};
    |        ^^^^^^^^^^ help: try simplifying it as shown: `!x`
 
 error: this if-then-else expression returns a bool literal
-  --> $DIR/fixable.rs:128:12
+  --> $DIR/fixable.rs:161:12
    |
 LL |       } else if returns_bool() {
    |  ____________^
@@ -108,7 +168,7 @@ LL | |     };
    | |_____^ help: you can reduce it to: `{ !returns_bool() }`
 
 error: this if-then-else expression returns a bool literal
-  --> $DIR/fixable.rs:141:5
+  --> $DIR/fixable.rs:174:5
    |
 LL | /     if unsafe { no(4) } & 1 != 0 {
 LL | |         true
@@ -118,16 +178,16 @@ LL | |     };
    | |_____^ help: you can reduce it to: `(unsafe { no(4) } & 1 != 0)`
 
 error: this if-then-else expression returns a bool literal
-  --> $DIR/fixable.rs:146:30
+  --> $DIR/fixable.rs:179:30
    |
 LL |     let _brackets_unneeded = if unsafe { no(4) } & 1 != 0 { true } else { false };
    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: you can reduce it to: `unsafe { no(4) } & 1 != 0`
 
 error: this if-then-else expression returns a bool literal
-  --> $DIR/fixable.rs:149:9
+  --> $DIR/fixable.rs:182:9
    |
 LL |         if unsafe { no(4) } & 1 != 0 { true } else { false }
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: you can reduce it to: `(unsafe { no(4) } & 1 != 0)`
 
-error: aborting due to 15 previous errors
+error: aborting due to 21 previous errors