From 053e8d72f623a79c5d10bb9f7e82911900dad711 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Thu, 12 Sep 2024 13:06:12 -0700
Subject: [PATCH] Enable fuzz-testing of `importize`

---
 fuzz/src/roundtrip_wit.rs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/fuzz/src/roundtrip_wit.rs b/fuzz/src/roundtrip_wit.rs
index ee31598005..7271fbd035 100644
--- a/fuzz/src/roundtrip_wit.rs
+++ b/fuzz/src/roundtrip_wit.rs
@@ -35,15 +35,18 @@ pub fn run(u: &mut Unstructured<'_>) -> Result<()> {
     // to avoid timing out this fuzzer with asan enabled.
     let mut decoded_worlds = Vec::new();
     for (id, world) in resolve.worlds.iter().take(20) {
-        log::debug!("testing world {}", world.name);
+        log::debug!("embedding world {} as in a dummy module", world.name);
         let mut dummy = wit_component::dummy_module(&resolve, id);
         wit_component::embed_component_metadata(&mut dummy, &resolve, id, StringEncoding::UTF8)
             .unwrap();
         write_file("dummy.wasm", &dummy);
 
+        // Decode what was just created and record it later for testing merging
+        // worlds together.
         let (_, decoded) = wit_component::metadata::decode(&dummy).unwrap();
         decoded_worlds.push(decoded.resolve);
 
+        log::debug!("... componentizing the world into a binary component");
         let wasm = wit_component::ComponentEncoder::default()
             .module(&dummy)
             .unwrap()
@@ -56,7 +59,15 @@ pub fn run(u: &mut Unstructured<'_>) -> Result<()> {
         .validate_all(&wasm)
         .unwrap();
 
+        log::debug!("... decoding the component itself");
         wit_component::decode(&wasm).unwrap();
+
+        // Test out importizing the world and then assert the world is still
+        // valid.
+        log::debug!("... importizing this world");
+        let mut resolve2 = resolve.clone();
+        let _ = resolve2.importize(id);
+        resolve.assert_valid();
     }
 
     if decoded_worlds.len() < 2 {