feat: Split up EncodingPathStorage functionality into different classes

test/unit/storage/keyvalue/ContainerPathStorage.test.ts

@@ -0,0 +1,47 @@
+import { ContainerPathStorage } from '../../../../src/storage/keyvalue/ContainerPathStorage';
+import type { KeyValueStorage } from '../../../../src/storage/keyvalue/KeyValueStorage';
+
+describe('An ContainerPathStorage', (): void => {
+  const relativePath = '/container/';
+  let map: Map<string, string>;
+  let source: KeyValueStorage<string, unknown>;
+  let storage: ContainerPathStorage<unknown>;
+
+  beforeEach(async(): Promise<void> => {
+    map = new Map<string, string>();
+    source = map as any;
+    storage = new ContainerPathStorage(source, relativePath);
+  });
+
+  it('joins the input key with the relativePath to create a new key.', async(): Promise<void> => {
+    const key = 'key';
+    const generatedPath = `${relativePath}${key}`;
+    const data = 'data';
+
+    await expect(storage.set(key, data)).resolves.toBe(storage);
+    expect(map.get(generatedPath)).toBe(data);
+
+    await expect(storage.has(key)).resolves.toBe(true);
+    await expect(storage.get(key)).resolves.toBe(data);
+    await expect(storage.entries().next()).resolves.toEqual({ done: false, value: [ key, data ]});
+
+    await expect(storage.delete(key)).resolves.toBe(true);
+    expect([ ...map.keys() ]).toHaveLength(0);
+  });
+
+  it('only returns entries from the source storage matching the relative path.', async(): Promise<void> => {
+    const generatedPath = `${relativePath}key`;
+    const otherPath = `/otherContainer/key`;
+    const data = 'data';
+
+    map.set(generatedPath, data);
+    map.set(otherPath, data);
+
+    const results = [];
+    for await (const entry of storage.entries()) {
+      results.push(entry);
+    }
+    expect(results).toHaveLength(1);
+    expect(results[0]).toEqual([ 'key', data ]);
+  });
+});