chore: add tests

src/modules/atproto/shortDid.spec.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from "vitest"
+
+import { fromShortDid, toShortDid } from "./shortDid"
+
+describe("toShortDid", () => {
+  it("strips did:plc: prefix", () => {
+    expect(toShortDid("did:plc:abc123")).toBe("abc123")
+  })
+
+  it("strips did: prefix but keeps the method when non-plc", () => {
+    expect(toShortDid("did:web:example.com")).toBe("web:example.com")
+  })
+
+  it("returns input unchanged when there is no did: prefix", () => {
+    expect(toShortDid("abc123")).toBe("abc123")
+  })
+})
+
+describe("fromShortDid", () => {
+  it("adds did:plc: prefix to bare identifiers", () => {
+    expect(fromShortDid("abc123")).toBe("did:plc:abc123")
+  })
+
+  it("adds did: prefix when method is already present", () => {
+    expect(fromShortDid("web:example.com")).toBe("did:web:example.com")
+  })
+
+  it("passes through fully-qualified DIDs unchanged", () => {
+    expect(fromShortDid("did:plc:abc123")).toBe("did:plc:abc123")
+    expect(fromShortDid("did:web:example.com")).toBe("did:web:example.com")
+  })
+})
+
+describe("round-trip toShortDid → fromShortDid", () => {
+  it.each(["did:plc:abc123", "did:web:example.com", "did:key:zXyZ"])(
+    "is identity for %s",
+    (did) => {
+      expect(fromShortDid(toShortDid(did))).toBe(did)
+    }
+  )
+})