diff --git a/src/shader.rs b/src/shader.rs
index 7494932..f4db914 100644
--- a/src/shader.rs
+++ b/src/shader.rs
@@ -67,4 +67,22 @@ pub fn add_includes(source: &String) -> String {
     }
 
     combined
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn preprocess_file() {
+        // Generate a shader and preprocess it
+        let mut source = read_to_string("src/shader.wgsl").unwrap();
+        source = add_includes(&source);
+
+        // Parse the WGSL into a usable module
+        let module = parse_wgsl(&source);
+
+        // Generate a valid WGSL string from the module
+        let gen_wgsl = generate_wgsl(&module);
+    }
 }
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