1 files changed, 46 insertions, 0 deletions
diff --git a/test/fabrics.test.ts b/test/fabrics.test.ts
new file mode 100644
index 0000000..b3cd18e
--- /dev/null
+++ b/test/fabrics.test.ts
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+import { describe, expect, it } from "vitest";
+import { findLikelyStrays, formatFabricTable, type FabricTable } from "../src/fabrics.js";
+
+const table: FabricTable = {
+  supportedFabrics: 5,
+  commissionedFabrics: 4,
+  entries: [
+    { fabricIndex: 1, fabricId: 100n, nodeId: 10n, vendorId: 0x1349, label: "Apple Home", isOurs: false },
+    { fabricIndex: 2, fabricId: 200n, nodeId: 20n, vendorId: 0xfff1, label: "mattertimesync", isOurs: true },
+    { fabricIndex: 3, fabricId: 300n, nodeId: 30n, vendorId: 0xfff1, label: "mattertimesync", isOurs: false },
+    { fabricIndex: 4, fabricId: 400n, nodeId: 40n, vendorId: 0xfff1, label: "mattertimesync", isOurs: false },
+  ],
+};
+
+describe("findLikelyStrays", () => {
+  it("flags entries with our label that are not our identity", () => {
+    expect(findLikelyStrays(table).map(entry => entry.fabricIndex)).toEqual([3, 4]);
+  });
+
+  it("never flags other ecosystems' entries", () => {
+    const strays = findLikelyStrays(table);
+    expect(strays.some(entry => entry.label === "Apple Home")).toBe(false);
+  });
+
+  it("flags nothing when our identity is not in the table", () => {
+    const withoutOurs: FabricTable = {
+      ...table,
+      entries: table.entries.map(entry => ({ ...entry, isOurs: false })),
+    };
+    expect(findLikelyStrays(withoutOurs)).toEqual([]);
+  });
+});
+
+describe("formatFabricTable", () => {
+  const output = formatFabricTable(1n, table);
+
+  it("shows slot usage and marks our entry", () => {
+    expect(output).toContain("4 of 5 slots used");
+    expect(output).toContain("[this controller]");
+  });
+
+  it("names known vendors and lists stale indices", () => {
+    expect(output).toContain("(Apple)");
+    expect(output).toContain("index 3, index 4");
+  });
+});