Convert to Shared Preference Plugin to Sandy

Summary:
per title

In addition, this diff adds `startUnactivated` option to allow setting up `onSend` mock implementation.

Reviewed By: mweststrate

Differential Revision: D24477989

fbshipit-source-id: f913574ebacdd436e8511baa43744249a014e90b

desktop/plugins/shared_preferences/src/__test__/shared_preferences.spec.tsx

@@ -0,0 +1,156 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import {TestUtils} from 'flipper-plugin';
+import * as plugin from '..';
+
+async function sleep(ms: number) {
+  return new Promise((resolve) => setTimeout(() => resolve(), ms));
+}
+
+// this testing is inspired by Flipper sample app
+test('general plugin logic testing', async () => {
+  const {instance, onSend, connect, sendEvent} = TestUtils.startPlugin(plugin, {
+    startUnactivated: true,
+  });
+  onSend.mockImplementation(async (method, params) => {
+    switch (method) {
+      case 'getAllSharedPreferences':
+        return {
+          sample: {Hello: 'world'},
+          other_sample: {SomeKey: 1337},
+        };
+      case 'setSharedPreference': {
+        const p = params as plugin.SetSharedPreferenceParams;
+        return {[p.preferenceName]: p.preferenceValue};
+      }
+      case 'deleteSharedPreference': {
+        return {};
+      }
+    }
+  });
+
+  // Retrieve some data when connect
+  connect();
+  await sleep(1000);
+  expect(onSend).toBeCalledWith('getAllSharedPreferences', {});
+  expect(instance.sharedPreferences.get()).toMatchInlineSnapshot(`
+    Object {
+      "other_sample": Object {
+        "changesList": Array [],
+        "preferences": Object {
+          "SomeKey": 1337,
+        },
+      },
+      "sample": Object {
+        "changesList": Array [],
+        "preferences": Object {
+          "Hello": "world",
+        },
+      },
+    }
+  `);
+  expect(instance.selectedPreferences.get()).toEqual('sample');
+
+  instance.setSelectedPreferences('other_sample');
+  expect(instance.selectedPreferences.get()).toEqual('other_sample');
+
+  // test changing preference
+  const changedPref = {
+    sharedPreferencesName: 'other_sample',
+    preferenceName: 'SomeKey',
+    preferenceValue: 5555,
+  };
+  await instance.setSharedPreference(changedPref);
+  // this is sent from client after successful update
+  sendEvent('sharedPreferencesChange', {
+    deleted: false,
+    name: 'SomeKey',
+    preferences: 'sample',
+    time: 1,
+    value: 5555,
+  });
+  expect(onSend).toBeCalledWith('setSharedPreference', changedPref);
+  expect(instance.sharedPreferences.get().sample.preferences.SomeKey).toEqual(
+    5555,
+  );
+  expect(instance.sharedPreferences.get()).toMatchInlineSnapshot(`
+    Object {
+      "other_sample": Object {
+        "changesList": Array [],
+        "preferences": Object {
+          "SomeKey": 5555,
+        },
+      },
+      "sample": Object {
+        "changesList": Array [
+          Object {
+            "deleted": false,
+            "name": "SomeKey",
+            "preferences": "sample",
+            "time": 1,
+            "value": 5555,
+          },
+        ],
+        "preferences": Object {
+          "Hello": "world",
+          "SomeKey": 5555,
+        },
+      },
+    }
+  `);
+
+  // test deleting preference
+  const deletedPref = {
+    sharedPreferencesName: 'other_sample',
+    preferenceName: 'SomeKey',
+  };
+  await instance.deleteSharedPreference(deletedPref);
+  // this is sent from client after successful update
+  sendEvent('sharedPreferencesChange', {
+    deleted: true,
+    name: 'SomeKey',
+    preferences: 'sample',
+    time: 2,
+  });
+  expect(onSend).toBeCalledWith('deleteSharedPreference', deletedPref);
+  expect(
+    instance.sharedPreferences.get().sample.preferences.SomeKey,
+  ).toBeUndefined();
+  expect(instance.sharedPreferences.get()).toMatchInlineSnapshot(`
+    Object {
+      "other_sample": Object {
+        "changesList": Array [],
+        "preferences": Object {},
+      },
+      "sample": Object {
+        "changesList": Array [
+          Object {
+            "deleted": true,
+            "name": "SomeKey",
+            "preferences": "sample",
+            "time": 2,
+          },
+          Object {
+            "deleted": false,
+            "name": "SomeKey",
+            "preferences": "sample",
+            "time": 1,
+            "value": 5555,
+          },
+        ],
+        "preferences": Object {
+          "Hello": "world",
+        },
+      },
+    }
+  `);
+});
+
+// TODO: Add unit test for UI