CLI: default pairing channel for pairing commands

src/cli/pairing-cli.test.ts

@@ -163,6 +163,15 @@ describe("pairing cli", () => {
     expect(listChannelPairingRequests).toHaveBeenCalledWith("zalo");
   });
 
+  it("defaults list to the sole available channel", async () => {
+    listPairingChannels.mockReturnValueOnce(["slack"]);
+    listChannelPairingRequests.mockResolvedValueOnce([]);
+
+    await runPairing(["pairing", "list"]);
+
+    expect(listChannelPairingRequests).toHaveBeenCalledWith("slack");
+  });
+
   it("accepts channel as positional for approve (npm-run compatible)", async () => {
     mockApprovedPairing();
 
@@ -199,4 +208,20 @@ describe("pairing cli", () => {
       accountId: "yy",
     });
   });
+
+  it("defaults approve to the sole available channel when only code is provided", async () => {
+    listPairingChannels.mockReturnValueOnce(["slack"]);
+    mockApprovedPairing();
+
+    await runPairing(["pairing", "approve", "ABCDEFGH"]);
+
+    expect(approveChannelPairingCode).toHaveBeenCalledWith({
+      channel: "slack",
+      code: "ABCDEFGH",
+    });
+  });
+
+  it("keeps approve usage error when multiple channels exist and channel is omitted", async () => {
+    await expect(runPairing(["pairing", "approve", "ABCDEFGH"])).rejects.toThrow("Usage:");
+  });
 });