add tests to #1022 (#1045)

Author: Fil

test/pager-test.ts

@@ -1,4 +1,5 @@
 import assert from "node:assert";
+import {normalizeConfig} from "../src/config.js";
 import {findLink as pager} from "../src/pager.js";
 
 describe("findLink(path, options)", () => {
@@ -92,4 +93,35 @@ describe("findLink(path, options)", () => {
     assert.deepStrictEqual(pager("/b", config), {prev: {name: "a", path: "/a"}, next: {name: "c", path: "/c"}});
     assert.deepStrictEqual(pager("/c", config), {prev: {name: "b", path: "/b"}, next: undefined});
   });
+  it("normalizes / to /index", async () => {
+    const config = await normalizeConfig({pages: [{name: "Home", path: "/"}]});
+    assert.strictEqual(pager("/index", config), undefined);
+    assert.strictEqual(pager("/", config), undefined);
+  });
+  it("normalizes / to /index (2)", async () => {
+    const config = await normalizeConfig({
+      pages: [
+        {name: "Home", path: "/"},
+        {name: "Second Home", path: "/second"}
+      ]
+    });
+    assert.deepStrictEqual(pager("/second", config), {next: undefined, prev: {name: "Home", path: "/index"}});
+    assert.deepStrictEqual(pager("/index", config), {next: {name: "Second Home", path: "/second"}, prev: undefined});
+    assert.strictEqual(pager("/", config), undefined);
+  });
+  it("normalizes / to /index (3)", async () => {
+    const config = await normalizeConfig({
+      pages: [
+        {name: "Home", path: "/"},
+        {name: "Second Home", path: "/second"},
+        {name: "By The Sea", path: "/by-the-sea"}
+      ]
+    });
+    assert.deepStrictEqual(pager("/second", config), {
+      next: {name: "By The Sea", path: "/by-the-sea"},
+      prev: {name: "Home", path: "/index"}
+    });
+    assert.deepStrictEqual(pager("/index", config), {next: {name: "Second Home", path: "/second"}, prev: undefined});
+    assert.strictEqual(pager("/", config), undefined);
+  });
 });