add test

packages/growi-commons/src/test/plugin/service/tag-cache-manager.test.js

@@ -6,9 +6,36 @@ const TagCacheManager = require('@src/plugin/service/tag-cache-manager');
 
 describe('TagCacheManager', () => {
 
+  test('.constructor throws Exception when \'cacheNs\' is null', () => {
+    const generateCacheKeyMock = jest.fn();
+
+    expect(() => {
+      // eslint-disable-next-line no-new
+      new TagCacheManager(null, generateCacheKeyMock);
+    }).toThrowError(/cacheNs/);
+  });
+
+  test('.constructor throws Exception when \'generateCacheKey\' is null', () => {
+    expect(() => {
+      // eslint-disable-next-line no-new
+      new TagCacheManager('dummy ns', null);
+    }).toThrowError(/generateCacheKey/);
+  });
+
+  test('.constructor throws Exception when \'generateCacheKey\' is not function', () => {
+    expect(() => {
+      // eslint-disable-next-line no-new
+      new TagCacheManager('dummy ns', {});
+    }).toThrowError(/generateCacheKey/);
+  });
+
   test('.constructor set params', () => {
-    const instance = new TagCacheManager('dummy ns', (tagContext) => {});
+    const generateCacheKeyMock = jest.fn();
+
+    const instance = new TagCacheManager('dummy ns', generateCacheKeyMock);
     expect(instance).not.toBeNull();
+    expect(instance.cacheNs).toBe('dummy ns');
+    expect(instance.generateCacheKey).toBe(generateCacheKeyMock);
   });
 
 });