diff --git a/mods/devtests.js b/mods/devtests.js
index bfc85af0..64244da5 100644
--- a/mods/devtests.js
+++ b/mods/devtests.js
@@ -139,3 +139,21 @@ elements.liquid = {
     ],
     category: "special"
 }
+elements.gas = {
+    behavior: [
+        "M1|M1|M1",
+        "M1|XX|M1",
+        "M1|M1|M1",
+    ],
+    state: "gas",
+    category: "special"
+}
+elements.liquid_gas = {
+    behavior: [
+        "M1%25|M1%25|M1%25",
+        "M2|XX|M2",
+        "M1|M1|M1",
+    ],
+    state: "gas",
+    category: "special"
+}