Add test fixtures for the revive WASM version (#160)

js/fixtures/storage.json

@@ -0,0 +1,22 @@
+{
+    "language": "Solidity",
+    "sources": {
+      "fixtures/storage.sol": {
+        "content": "// SPDX-License-Identifier: GPL-3.0\npragma solidity >=0.8.2 <0.9.0;\ncontract Storage {\n uint256 number;\n function store(uint256 num) public { number = num; }\n function retrieve() public view returns (uint256){ return number; }\n}"
+      }
+    },
+    "settings": {
+      "optimizer": {
+        "enabled": true,
+        "runs": 200
+      },
+      "outputSelection": {
+        "*": {
+          "*": [
+            "abi"
+          ]
+        }
+      }
+    }
+  }
+