From 2005a8349ff91a0791d1046629cd4b72001fe9fe Mon Sep 17 00:00:00 2001
From: Ekleog-NEAR <96595974+Ekleog-NEAR@users.noreply.github.com>
Date: Fri, 8 Mar 2024 01:02:05 +0100
Subject: [PATCH] introduce an always-failing fuzzer, to sanity-check our
 clusterfuzz setup (#10723)
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Based on the clusterfuzz web UI I cannot confirm whether it is actually
working properly, and I’m under the impression that it is actually not
running the fuzzers we’re asking it to.

This fuzzer should make it obvious: if clusterfuzz does not report a
fuzzer failure on it, then it is broken.

There is no good place for it, so I just put it in our current
"everything else" near-primitives crate, as it has basically no internal
dependencies on anything it’ll be very easy to move it out whenever we
actually get close to getting rid of near-primitives.
---
 Cargo.lock                 | 1 +
 core/primitives/Cargo.toml | 1 +
 core/primitives/src/lib.rs | 8 ++++++++
 3 files changed, 10 insertions(+)

diff --git a/Cargo.lock b/Cargo.lock
index 1bed020d444..14987985d25 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4190,6 +4190,7 @@ dependencies = [
  "assert_matches",
  "base64 0.21.0",
  "bencher",
+ "bolero",
  "borsh 1.0.0",
  "bytesize",
  "cfg-if 1.0.0",
diff --git a/core/primitives/Cargo.toml b/core/primitives/Cargo.toml
index 084175ec52d..6e4bd93588e 100644
--- a/core/primitives/Cargo.toml
+++ b/core/primitives/Cargo.toml
@@ -91,6 +91,7 @@ calimero_zero_storage = []
 [dev-dependencies]
 assert_matches.workspace = true
 bencher.workspace = true
+bolero.workspace = true
 insta.workspace = true
 expect-test.workspace = true
 
diff --git a/core/primitives/src/lib.rs b/core/primitives/src/lib.rs
index f15100ad7cf..ed70396a719 100644
--- a/core/primitives/src/lib.rs
+++ b/core/primitives/src/lib.rs
@@ -42,3 +42,11 @@ pub mod views;
 
 pub use crate::version::checked_feature;
 pub use near_primitives_core::chains;
+
+#[cfg(fuzz)]
+#[test]
+fn failing_fuzzer() {
+    // This fuzzer always fails. It is used as a sanity-check that our clusterfuzz instance
+    // is working properly, as it has silently stopped working quite a few times already.
+    bolero::check!().for_each(|_| panic!("The expected-to-fail fuzzer actually failed"))
+}