1 files changed, 58 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/float_cmp_const.rs b/src/tools/clippy/tests/ui/float_cmp_const.rs
new file mode 100644
index 000000000..86ce3bf3b
--- /dev/null
+++ b/src/tools/clippy/tests/ui/float_cmp_const.rs
@@ -0,0 +1,58 @@
+// does not test any rustfixable lints
+
+#![warn(clippy::float_cmp_const)]
+#![allow(clippy::float_cmp)]
+#![allow(unused, clippy::no_effect, clippy::unnecessary_operation)]
+
+const ONE: f32 = 1.0;
+const TWO: f32 = 2.0;
+
+fn eq_one(x: f32) -> bool {
+    if x.is_nan() { false } else { x == ONE } // no error, inside "eq" fn
+}
+
+fn main() {
+    // has errors
+    1f32 == ONE;
+    TWO == ONE;
+    TWO != ONE;
+    ONE + ONE == TWO;
+    let x = 1;
+    x as f32 == ONE;
+
+    let v = 0.9;
+    v == ONE;
+    v != ONE;
+
+    // no errors, lower than or greater than comparisons
+    v < ONE;
+    v > ONE;
+    v <= ONE;
+    v >= ONE;
+
+    // no errors, zero and infinity values
+    ONE != 0f32;
+    TWO == 0f32;
+    ONE != f32::INFINITY;
+    ONE == f32::NEG_INFINITY;
+
+    // no errors, but will warn clippy::float_cmp if '#![allow(float_cmp)]' above is removed
+    let w = 1.1;
+    v == w;
+    v != w;
+    v == 1.0;
+    v != 1.0;
+
+    const ZERO_ARRAY: [f32; 3] = [0.0, 0.0, 0.0];
+    const ZERO_INF_ARRAY: [f32; 3] = [0.0, f32::INFINITY, f32::NEG_INFINITY];
+    const NON_ZERO_ARRAY: [f32; 3] = [0.0, 0.1, 0.2];
+    const NON_ZERO_ARRAY2: [f32; 3] = [0.2, 0.1, 0.0];
+
+    // no errors, zero and infinity values
+    NON_ZERO_ARRAY[0] == NON_ZERO_ARRAY2[1]; // lhs is 0.0
+    ZERO_ARRAY == NON_ZERO_ARRAY; // lhs is all zeros
+    ZERO_INF_ARRAY == NON_ZERO_ARRAY; // lhs is all zeros or infinities
+
+    // has errors
+    NON_ZERO_ARRAY == NON_ZERO_ARRAY2;
+}