Use test-utils for all zkvms (#88)

tests/openvm/basic/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "ere-test-openvm-guest"
+version = "0.1.0"
+edition = "2021"
+
+[workspace]
+
+[dependencies]
+openvm = { git = "https://github.com/openvm-org/openvm.git", features = ["std"], tag = "v1.2.0" }
+test-utils = { path = "../../../crates/test-utils" }

tests/openvm/basic/src/main.rs

@@ -0,0 +1,16 @@
+use openvm::io::{read, read_vec, reveal_u32};
+use test_utils::guest::BasicStruct;
+
+fn main() {
+    // Read `Hello world` bytes.
+    let bytes = read_vec();
+    assert_eq!(String::from_utf8_lossy(&bytes), "Hello world");
+
+    // Read `BasicStruct`.
+    let basic_struct = read::<BasicStruct>();
+    let output = basic_struct.output();
+
+    output.chunks(4).enumerate().for_each(|(idx, bytes)| {
+        reveal_u32(u32::from_le_bytes(bytes.try_into().unwrap()), idx);
+    });
+}