diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..7540e8d
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "conformance_tests/cel-spec"]
+	path = conformance_tests/cel-spec
+	url = git@github.com:google/cel-spec.git
+[submodule "conformance_tests/googleapis"]
+	path = conformance_tests/googleapis
+	url = git@github.com:googleapis/googleapis.git
diff --git a/Cargo.toml b/Cargo.toml
index 3125f83..611e833 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,2 +1,3 @@
 [workspace]
-members = ["parser", "program", "web"]
\ No newline at end of file
+members = ["parser", "program", "web", "cel_spec"]
+resolver = "1"
\ No newline at end of file
diff --git a/cel_spec/Cargo.toml b/cel_spec/Cargo.toml
new file mode 100644
index 0000000..87f91f9
--- /dev/null
+++ b/cel_spec/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "cel_spec"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+prost = "0.12"
+prost-types = "0.12"
+prost-reflect = { version =  "0.13.0", features = ["text-format"]}
+quote = "1.0.35"
+program = { path = "../program" }
+
+[build_dependencies]
+prost-build = "0.12.3"
diff --git a/cel_spec/build.rs b/cel_spec/build.rs
new file mode 100644
index 0000000..e755986
--- /dev/null
+++ b/cel_spec/build.rs
@@ -0,0 +1,13 @@
+use std::{env, io::Result, path::PathBuf};
+
+fn main() -> Result<()> {
+    let out = env::var("OUT_DIR").expect("OUT_DIR environment variable not set");
+    let out = PathBuf::from(out).join("cel.bin");
+    let mut config = prost_build::Config::new();
+    config.disable_comments(&["."]);
+    config.file_descriptor_set_path(out);
+    config.compile_protos(
+        &["cel-spec/proto/test/v1/simple.proto"],
+        &["cel-spec/proto/", "googleapis/"],
+    )
+}
diff --git a/cel_spec/src/lib.rs b/cel_spec/src/lib.rs
new file mode 100644
index 0000000..77fdeb8
--- /dev/null
+++ b/cel_spec/src/lib.rs
@@ -0,0 +1,44 @@
+use proc_macro::TokenStream;
+use quote::{format_ident, quote, ToTokens};
+
+const BYTES: &[u8] = include_bytes!(concat!(env!("OUT_DIR"), "/cel.bin"));
+
+#[proc_macro]
+pub fn cel_test(attr: TokenStream) -> TokenStream {
+    println!("attr: \"{}\"", attr.to_string());
+    use prost_reflect::{DescriptorPool, DynamicMessage};
+
+    let pool = DescriptorPool::decode(BYTES.as_ref()).unwrap();
+    let message_descriptor = pool.get_message_by_name("google.api.expr.test.v1.SimpleTestFile").unwrap();
+    let bytes = include_str!("../cel-spec/tests/simple/testdata/basic.textproto");
+    let suite = DynamicMessage::parse_text_format(message_descriptor, &bytes).unwrap();
+
+    let mut ast = String::new();
+    for section in suite.get_field_by_name("section").unwrap().as_list().unwrap() {
+        let section = section.as_message().unwrap();
+        let sname = section.get_field_by_name("name").unwrap();
+
+        ast.push_str(format!("pub mod {}{{", sname.as_str().unwrap()).as_str());
+
+        for case in section.get_field_by_name("test").unwrap().as_list().unwrap() {
+            let case = case.as_message().unwrap();
+            let name = case.get_field_by_name("name").unwrap();
+            let expr = case.get_field_by_name("expr").unwrap();
+   
+            let name = format_ident!("{}", name.as_str().unwrap());
+            let expr = expr.as_str().unwrap();
+            ast.push_str(
+                &quote!{
+                    #[test]
+                    fn #name() {
+                        assert!(program::Program::new(#expr).expect("failed to compile").execute(program::context::Context::default()));
+                    }
+                }.to_string()
+            )
+        }
+
+        ast.push_str("}");
+        break;
+    }
+    ast.parse().unwrap()
+}
\ No newline at end of file
diff --git a/cel_spec/tests/test.rs b/cel_spec/tests/test.rs
new file mode 100644
index 0000000..01703d6
--- /dev/null
+++ b/cel_spec/tests/test.rs
@@ -0,0 +1,6 @@
+
+extern crate cel_spec;
+
+cel_spec::cel_test!(suite = "basic");
+
+
diff --git a/program/Cargo.toml b/program/Cargo.toml
index 9606b56..293a1d5 100644
--- a/program/Cargo.toml
+++ b/program/Cargo.toml
@@ -9,3 +9,4 @@ edition = "2021"
 parser = {path = "../parser"}
 ordered-float = "4.2.0"
 ordered_hash_map = "0.4.0"
+prost-reflect = "0.13.0"
\ No newline at end of file
diff --git a/web/Cargo.toml b/web/Cargo.toml
index 6daa73f..a4bd8b8 100644
--- a/web/Cargo.toml
+++ b/web/Cargo.toml
@@ -9,6 +9,3 @@ crate-type = ["cdylib"]
 [dependencies]
 program = {path = "../program"}
 wasm-bindgen = "0.2"
-
-[profile.release]
-panic = "unwind"
\ No newline at end of file