zk/tests: Dump circuit layouts into target/

src/zk/circuit/burn_contract.rs

@@ -576,7 +576,8 @@ mod tests {
         };
 
         use plotters::prelude::*;
-        let root = BitMapBackend::new("burn_circuit_layout.png", (3840, 2160)).into_drawing_area();
+        let root =
+            BitMapBackend::new("target/burn_circuit_layout.png", (3840, 2160)).into_drawing_area();
         root.fill(&WHITE).unwrap();
         let root = root.titled("Burn Circuit Layout", ("sans-serif", 60)).unwrap();
         CircuitLayout::default().render(11, &circuit, &root).unwrap();

src/zk/circuit/mint_contract.rs

@@ -371,7 +371,8 @@ mod tests {
         };
 
         use plotters::prelude::*;
-        let root = BitMapBackend::new("mint_circuit_layout.png", (3840, 2160)).into_drawing_area();
+        let root =
+            BitMapBackend::new("target/mint_circuit_layout.png", (3840, 2160)).into_drawing_area();
         root.fill(&WHITE).unwrap();
         let root = root.titled("Mint Circuit Layout", ("sans-serif", 60)).unwrap();
         CircuitLayout::default().render(8, &circuit, &root).unwrap();

src/zk/gadget/arithmetic.rs

@@ -291,8 +291,8 @@ mod tests {
         };
 
         use plotters::prelude::*;
-        let root =
-            BitMapBackend::new("arithmetic_circuit_layout.png", (3840, 2160)).into_drawing_area();
+        let root = BitMapBackend::new("target/arithmetic_circuit_layout.png", (3840, 2160))
+            .into_drawing_area();
         root.fill(&WHITE).unwrap();
         let root = root.titled("Arithmetic Circuit Layout", ("sans-serif", 60)).unwrap();
         CircuitLayout::default().render(4, &circuit, &root).unwrap();