[Test Improver] Add unit tests for useRuntimeFlag composable

shell/composables/useRuntimeFlag.test.ts

@@ -0,0 +1,59 @@
+import { ref } from 'vue';
+import { useRuntimeFlag } from '@shell/composables/useRuntimeFlag';
+
+const mockVersion = ref('2.12.0');
+const mockGetVersionInfo = jest.fn(() => ({ fullVersion: mockVersion.value }));
+
+jest.mock('@shell/utils/version', () => ({ getVersionInfo: (...args: any[]) => mockGetVersionInfo(...args) }));
+
+describe('useRuntimeFlag', () => {
+  describe('featureDropdownMenu', () => {
+    const { featureDropdownMenu } = useRuntimeFlag({} as any);
+
+    it.each([
+      {
+        desc:        'version at boundary 2.11.0',
+        fullVersion: '2.11.0',
+        expected:    true,
+      },
+      {
+        desc:        'version above boundary',
+        fullVersion: '2.12.0',
+        expected:    true,
+      },
+      {
+        desc:        'v-prefixed version at boundary',
+        fullVersion: 'v2.11.0',
+        expected:    true,
+      },
+      {
+        desc:        'pre-release version at boundary',
+        fullVersion: '2.11.0-rc1',
+        expected:    true,
+      },
+      {
+        desc:        'version just below boundary',
+        fullVersion: '2.10.9',
+        expected:    false,
+      },
+      {
+        desc:        'old version well below boundary',
+        fullVersion: '2.0.0',
+        expected:    false,
+      },
+      {
+        desc:        'uncoercible dev version string',
+        fullVersion: 'dev',
+        expected:    false,
+      },
+      {
+        desc:        'unknown version string',
+        fullVersion: 'unknown',
+        expected:    false,
+      },
+    ])('returns $expected for $desc', ({ fullVersion, expected }) => {
+      mockVersion.value = fullVersion;
+      expect(featureDropdownMenu.value).toStrictEqual(expected);
+    });
+  });
+});