fix: finish 2.9.0 plugin moves and get every check green

plugins/step-ca/tests/backend/settings-validation.test.ts

@@ -0,0 +1,25 @@
+import { describe, expect, it } from "vitest";
+import { validateCaSettings } from "../../src/backend/client.js";
+
+describe("validateCaSettings", () => {
+  it("accepts an https URL and a SHA-256 fingerprint", () => {
+    expect(
+      validateCaSettings({
+        caUrl: "https://ca.example.com:9000/",
+        fingerprint: "ab".repeat(32),
+      }),
+    ).toEqual({});
+  });
+
+  it("rejects a plain http URL and a short fingerprint at save time", () => {
+    const errors = validateCaSettings({
+      caUrl: "http://ca.example.com",
+      fingerprint: "abcd",
+    });
+    expect(Object.keys(errors).sort()).toEqual(["caUrl", "fingerprint"]);
+  });
+
+  it("leaves empty fields to the not-configured message", () => {
+    expect(validateCaSettings({ caUrl: "", fingerprint: " " })).toEqual({});
+  });
+});