1 files changed, 108 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/eq_op.rs b/src/tools/clippy/tests/ui/eq_op.rs
new file mode 100644
index 000000000..422f94865
--- /dev/null
+++ b/src/tools/clippy/tests/ui/eq_op.rs
@@ -0,0 +1,108 @@
+// compile-flags: --test
+
+#![warn(clippy::eq_op)]
+#![allow(clippy::double_parens, clippy::identity_op, clippy::nonminimal_bool)]
+
+fn main() {
+    // simple values and comparisons
+    let _ = 1 == 1;
+    let _ = "no" == "no";
+    // even though I agree that no means no ;-)
+    let _ = false != false;
+    let _ = 1.5 < 1.5;
+    let _ = 1u64 >= 1u64;
+
+    // casts, methods, parentheses
+    let _ = (1u32 as u64) & (1u32 as u64);
+    #[rustfmt::skip]
+    {
+        let _ = 1 ^ ((((((1))))));
+    };
+
+    // unary and binary operators
+    let _ = (-(2) < -(2));
+    let _ = ((1 + 1) & (1 + 1) == (1 + 1) & (1 + 1));
+    let _ = (1 * 2) + (3 * 4) == 1 * 2 + 3 * 4;
+
+    // various other things
+    let _ = ([1] != [1]);
+    let _ = ((1, 2) != (1, 2));
+    let _ = vec![1, 2, 3] == vec![1, 2, 3]; //no error yet, as we don't match macros
+
+    // const folding
+    let _ = 1 + 1 == 2;
+    let _ = 1 - 1 == 0;
+
+    let _ = 1 - 1;
+    let _ = 1 / 1;
+    let _ = true && true;
+
+    let _ = true || true;
+
+    let a: u32 = 0;
+    let b: u32 = 0;
+
+    let _ = a == b && b == a;
+    let _ = a != b && b != a;
+    let _ = a < b && b > a;
+    let _ = a <= b && b >= a;
+
+    let mut a = vec![1];
+    let _ = a == a;
+    let _ = 2 * a.len() == 2 * a.len(); // ok, functions
+    let _ = a.pop() == a.pop(); // ok, functions
+
+    check_ignore_macro();
+
+    // named constants
+    const A: u32 = 10;
+    const B: u32 = 10;
+    const C: u32 = A / B; // ok, different named constants
+    const D: u32 = A / A;
+}
+
+macro_rules! check_if_named_foo {
+    ($expression:expr) => {
+        if stringify!($expression) == "foo" {
+            println!("foo!");
+        } else {
+            println!("not foo.");
+        }
+    };
+}
+
+macro_rules! bool_macro {
+    ($expression:expr) => {
+        true
+    };
+}
+
+fn check_ignore_macro() {
+    check_if_named_foo!(foo);
+    // checks if the lint ignores macros with `!` operator
+    let _ = !bool_macro!(1) && !bool_macro!("");
+}
+
+struct Nested {
+    inner: ((i32,), (i32,), (i32,)),
+}
+
+fn check_nested(n1: &Nested, n2: &Nested) -> bool {
+    // `n2.inner.0.0` mistyped as `n1.inner.0.0`
+    (n1.inner.0).0 == (n1.inner.0).0 && (n1.inner.1).0 == (n2.inner.1).0 && (n1.inner.2).0 == (n2.inner.2).0
+}
+
+#[test]
+fn eq_op_shouldnt_trigger_in_tests() {
+    let a = 1;
+    let result = a + 1 == 1 + a;
+    assert!(result);
+}
+
+#[test]
+fn eq_op_macros_shouldnt_trigger_in_tests() {
+    let a = 1;
+    let b = 2;
+    assert_eq!(a, a);
+    assert_eq!(a + b, b + a);
+}