vault deployment, query helper, bug fixes

test/TestOrder.sol

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+// SPDX-License-Identifier: UNLICENSED
+pragma solidity =0.7.6;
+pragma abicoder v2;
+
+import "./MockEnv.sol";
+import "forge-std/Test.sol";
+import "../src/Factory.sol";
+
+contract TestOrder is MockEnv, Test {
+    Factory public factory;
+    Vault public vault;
+
+    // vault gets 100,000 COIN and 100,000 USD
+    function setUp() public {
+        factory = new Factory();
+        vault = Vault(factory.deployVault(address(this)));
+        uint256 coinAmount = 100_000 * 10 ** COIN.decimals();
+        COIN.mint(address(vault), coinAmount);
+        uint256 usdAmount = 100_000 * 10 ** USD.decimals();
+        USD.mint(address(vault), usdAmount);
+    }
+
+
+    function testOrder() public {
+
+    }
+
+
+}