Write the foundry test

packages/contracts-periphery/contracts/foundry-tests/AttestationStation.t.sol

+//SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
+
+/* Testing utilities */
+import { Test } from "forge-std/Test.sol";
+import { TestERC20 } from "../testing/helpers/TestERC20.sol";
+import { TestERC721 } from "../testing/helpers/TestERC721.sol";
+import { AssetReceiver } from "../universal/AssetReceiver.sol";
+import { AttestationStation } from "../universal/op-nft/AttestationStation.sol";
+
+contract AssetReceiver_Initializer is Test {
+    address alice_attestor = address(128);
+    address bob = address(256);
+    address sally = address(512);
+
+    function _setUp() public {
+        // Give alice and bob some ETH
+        vm.deal(alice_attestor, 1 ether);
+
+        vm.label(alice_attestor, "alice_attestor");
+        vm.label(bob, "bob");
+        vm.label(sally, "sally");
+    }
+}
+
+contract AssetReceiverTest is AssetReceiver_Initializer {
+    function setUp() public {
+        super._setUp();
+    }
+
+    function test_attest_single() external {
+        AttestationStation attestationStation = new AttestationStation();
+        attestationStation.initialize();
+
+        // alice is going to attest about bob
+        AttestationStation.AttestationData memory attestationData = AttestationStation
+            .AttestationData({
+                about: bob,
+                key: bytes32("test-key:string"),
+                val: bytes("test-value")
+            });
+
+        // assert the attestation starts empty
+        assertEq(attestationStation.attestations(address(this), address(this), "test"), "");
+
+        // make attestation
+        vm.prank(alice_attestor);
+        attestationStation.attest(attestationData.about, attestationData.key, attestationData.val);
+
+        // assert the attestation is there
+        assertEq(
+            attestationStation.readAttestation(
+                alice_attestor,
+                attestationData.about,
+                attestationData.key
+            ),
+            attestationData.val
+        );
+
+        bytes memory new_val = bytes("new updated value");
+        // make a new attestations to same about and key
+        attestationData = AttestationStation.AttestationData({
+            about: attestationData.about,
+            key: attestationData.key,
+            val: new_val
+        });
+
+        vm.prank(alice_attestor);
+        attestationStation.attest(attestationData.about, attestationData.key, attestationData.val);
+
+        // assert the attestation is updated
+        assertEq(
+            attestationStation.readAttestation(
+                alice_attestor,
+                attestationData.about,
+                attestationData.key
+            ),
+            attestationData.val
+        );
+    }
+
+    function test_attest_bulk() external {
+        AttestationStation attestationStation = new AttestationStation();
+
+        vm.prank(alice_attestor);
+
+        AttestationStation.AttestationData[]
+            memory attestationData = new AttestationStation.AttestationData[](3);
+        attestationData[0] = AttestationStation.AttestationData({
+            about: bob,
+            key: bytes32("test-key:string"),
+            val: bytes("test-value")
+        });
+
+        attestationData[1] = AttestationStation.AttestationData({
+            about: bob,
+            key: bytes32("test-key2"),
+            val: bytes("test-value2")
+        });
+
+        attestationData[2] = AttestationStation.AttestationData({
+            about: sally,
+            key: bytes32("test-key:string"),
+            val: bytes("test-value3")
+        });
+
+        attestationStation.attestBulk(attestationData);
+
+        // assert the attestations are there
+        assertEq(
+            attestationStation.readAttestation(
+                alice_attestor,
+                attestationData[0].about,
+                attestationData[0].key
+            ),
+            attestationData[0].val
+        );
+        assertEq(
+            attestationStation.readAttestation(
+                alice_attestor,
+                attestationData[1].about,
+                attestationData[1].key
+            ),
+            attestationData[1].val
+        );
+        assertEq(
+            attestationStation.readAttestation(
+                alice_attestor,
+                attestationData[2].about,
+                attestationData[2].key
+            ),
+            attestationData[2].val
+        );
+    }
+}