refactor: cover last 3 branches with tests

src/assertCacheEntry.ts

@@ -1,5 +1,9 @@
 import type { CacheMetadata } from './common';
 
+export function logKey(key?: string) {
+  return key ? `for ${key} ` : '';
+}
+
 export function assertCacheEntry(
   entry: unknown,
   key?: string,
@@ -9,9 +13,9 @@ export function assertCacheEntry(
 } {
   if (!isRecord(entry)) {
     throw new Error(
-      `Cache entry ${
-        key ? `for ${key} ` : ''
-      }is not a cache entry object, it's a ${typeof entry}`,
+      `Cache entry ${logKey(
+        key,
+      )}is not a cache entry object, it's a ${typeof entry}`,
     );
   }
   if (
@@ -21,17 +25,13 @@ export function assertCacheEntry(
     (entry.metadata.swr != null && typeof entry.metadata.swr !== 'number')
   ) {
     throw new Error(
-      `Cache entry ${
-        key ? `for ${key} ` : ''
-      }does not have valid metadata property`,
+      `Cache entry ${logKey(key)}does not have valid metadata property`,
     );
   }
 
   if (!('value' in entry)) {
     throw new Error(
-      `Cache entry for ${
-        key ? `for ${key} ` : ''
-      }does not have a value property`,
+      `Cache entry for ${logKey(key)}does not have a value property`,
     );
   }
 }

src/cachified.spec.ts

@@ -18,6 +18,7 @@ import {
   totalTtl,
 } from './index';
 import { Deferred } from './createBatch';
+import { logKey } from './assertCacheEntry';
 
 jest.mock('./index', () => {
   if (process.version.startsWith('v18')) {
@@ -1249,7 +1250,9 @@ describe('cachified', () => {
       (cb as Function)(new Error('Nope2'), null);
       return false;
     });
-    expect(cache.delete('test-0')).rejects.toThrowErrorMatchingInlineSnapshot(`"Nope2"`);
+    expect(cache.delete('test-0')).rejects.toThrowErrorMatchingInlineSnapshot(
+      `"Nope2"`,
+    );
 
     // handle corrupt cache
     await new Promise((res) => redis.set('test-3', '{{{', res));
@@ -1589,3 +1592,9 @@ describe('totalTtl helper', () => {
     expect(totalTtl({ createdTime: 0, swr: 5 })).toBe(5);
   });
 });
+
+describe('internal logKey helper', () => {
+  it('falls back to empty string, when no key given', () => {
+    expect(logKey()).toBe('');
+  });
+});