diff --git a/packages/cosmwasm/src/cw1cosmwasmclient.spec.ts b/packages/cosmwasm/src/cw1cosmwasmclient.spec.ts
new file mode 100644
index 00000000..c3824ffd
--- /dev/null
+++ b/packages/cosmwasm/src/cw1cosmwasmclient.spec.ts
@@ -0,0 +1,139 @@
+/* eslint-disable @typescript-eslint/naming-convention */
+import { coins, Secp256k1HdWallet } from "@cosmjs/launchpad";
+
+import { Cw1CosmWasmClient } from "./cw1cosmwasmclient";
+import {
+  alice,
+  deployedCw1,
+  launchpad,
+  makeRandomAddress,
+  pendingWithoutCw1,
+  pendingWithoutLaunchpad,
+} from "./testutils.spec";
+
+describe("Cw1CosmWasmClient", () => {
+  const contractAddress = deployedCw1.instances[0];
+  const defaultToAddress = makeRandomAddress();
+  const defaultMsg = {
+    bank: {
+      send: {
+        from_address: contractAddress,
+        to_address: defaultToAddress,
+        amount: coins(1, "ucosm"),
+      },
+    },
+  };
+
+  describe("constructor", () => {
+    it("can be constructed", async () => {
+      const wallet = await Secp256k1HdWallet.fromMnemonic(alice.mnemonic);
+      const client = new Cw1CosmWasmClient(launchpad.endpoint, alice.address0, wallet, contractAddress);
+      expect(client).toBeTruthy();
+    });
+  });
+
+  describe("canSend", () => {
+    it("returns true if client signer can send", async () => {
+      pendingWithoutLaunchpad();
+      pendingWithoutCw1();
+
+      const wallet = await Secp256k1HdWallet.fromMnemonic(alice.mnemonic);
+      const client = new Cw1CosmWasmClient(
+        launchpad.endpoint,
+        alice.address0,
+        wallet,
+        deployedCw1.instances[0],
+      );
+      const result = await client.canSend(defaultMsg);
+
+      expect(result).toEqual({ can_send: true });
+    });
+
+    it("returns false if client signer cannot send", async () => {
+      pendingWithoutLaunchpad();
+      pendingWithoutCw1();
+
+      const wallet = await Secp256k1HdWallet.fromMnemonic(alice.mnemonic);
+      const client = new Cw1CosmWasmClient(
+        launchpad.endpoint,
+        alice.address1,
+        wallet,
+        deployedCw1.instances[0],
+      );
+      const result = await client.canSend(defaultMsg);
+
+      expect(result).toEqual({ can_send: false });
+    });
+
+    it("returns true if supplied signer can send", async () => {
+      pendingWithoutLaunchpad();
+      pendingWithoutCw1();
+
+      const wallet = await Secp256k1HdWallet.fromMnemonic(alice.mnemonic);
+      const client = new Cw1CosmWasmClient(
+        launchpad.endpoint,
+        alice.address1,
+        wallet,
+        deployedCw1.instances[0],
+      );
+      const result = await client.canSend(defaultMsg, alice.address0);
+
+      expect(result).toEqual({ can_send: true });
+    });
+
+    it("returns false if supplied signer cannot send", async () => {
+      pendingWithoutLaunchpad();
+      pendingWithoutCw1();
+
+      const wallet = await Secp256k1HdWallet.fromMnemonic(alice.mnemonic);
+      const client = new Cw1CosmWasmClient(
+        launchpad.endpoint,
+        alice.address0,
+        wallet,
+        deployedCw1.instances[0],
+      );
+      const result = await client.canSend(defaultMsg, alice.address1);
+
+      expect(result).toEqual({ can_send: false });
+    });
+  });
+
+  describe("executeSubkey", () => {
+    it("works", async () => {
+      pendingWithoutLaunchpad();
+      pendingWithoutCw1();
+
+      const wallet = await Secp256k1HdWallet.fromMnemonic(alice.mnemonic);
+      const client = new Cw1CosmWasmClient(
+        launchpad.endpoint,
+        alice.address0,
+        wallet,
+        deployedCw1.instances[0],
+      );
+      const result = await client.executeSubkey([defaultMsg]);
+
+      expect(result.transactionHash).toBeTruthy();
+    });
+
+    it("works with a transfer", async () => {
+      pendingWithoutLaunchpad();
+      pendingWithoutCw1();
+
+      const wallet = await Secp256k1HdWallet.fromMnemonic(alice.mnemonic);
+      const client = new Cw1CosmWasmClient(
+        launchpad.endpoint,
+        alice.address0,
+        wallet,
+        deployedCw1.instances[0],
+      );
+      const balanceBefore = parseInt((await client.getAccount())!.balance[0].amount, 10);
+      const memo = "This time with coins";
+      const transferAmount = coins(1000, "ucosm");
+      const result = await client.executeSubkey([defaultMsg], memo, transferAmount);
+      const balanceAfter = parseInt((await client.getAccount())!.balance[0].amount, 10);
+
+      expect(result.transactionHash).toBeTruthy();
+      expect(balanceAfter).toEqual(balanceBefore + 999);
+    });
+  });
+});