diff --git a/desktop/app/src/utils/__tests__/sideEffect.node.tsx b/desktop/app/src/utils/__tests__/sideEffect.node.tsx
index 4ef6a3259..59897f046 100644
--- a/desktop/app/src/utils/__tests__/sideEffect.node.tsx
+++ b/desktop/app/src/utils/__tests__/sideEffect.node.tsx
@@ -59,8 +59,7 @@ describe('sideeffect', () => {
     console.error = origError;
   });
 
-  // TODO(T93353978): Re-enable.
-  test.skip('can run a basic effect', async () => {
+  test.local('can run a basic effect', async () => {
     unsubscribe = sideEffect(
       store,
       {name: 'test', throttleMs: 1},
diff --git a/desktop/flipper-plugin/src/ui/data-inspector/__tests__/DataInspector.node.tsx b/desktop/flipper-plugin/src/ui/data-inspector/__tests__/DataInspector.node.tsx
index e137f3a66..3c9827f5a 100644
--- a/desktop/flipper-plugin/src/ui/data-inspector/__tests__/DataInspector.node.tsx
+++ b/desktop/flipper-plugin/src/ui/data-inspector/__tests__/DataInspector.node.tsx
@@ -71,8 +71,7 @@ test('can manually collapse properties', async () => {
   });
 });
 
-// TODO(T95985157): Flaky in open source.
-test.skip('can filter for data', async () => {
+test.local('can filter for data', async () => {
   const res = render(
     <DataInspector data={json} collapsed={false} expandRoot />,
   );
diff --git a/desktop/flipper-plugin/src/utils/__tests__/shallowSerialization.node.tsx b/desktop/flipper-plugin/src/utils/__tests__/shallowSerialization.node.tsx
index babf952e7..3f6520e3e 100644
--- a/desktop/flipper-plugin/src/utils/__tests__/shallowSerialization.node.tsx
+++ b/desktop/flipper-plugin/src/utils/__tests__/shallowSerialization.node.tsx
@@ -225,8 +225,10 @@ test('test serialize and deserializeShallowObject function for non Object input'
   );
 });
 
-if (process.platform !== 'win32') {
-  test('test makeObjectSerializable and deserializeShallowObject function for Date input', () => {
+// dates on windows don't support changed timezones
+test.unix(
+  'test makeObjectSerializable and deserializeShallowObject function for Date input',
+  () => {
     const date = new Date(2021, 1, 29, 10, 31, 7, 205);
     expect(makeShallowSerializable(date)).toMatchInlineSnapshot(`
     Object {
@@ -237,8 +239,8 @@ if (process.platform !== 'win32') {
     expect(deserializeShallowObject(makeShallowSerializable(date))).toEqual(
       date,
     );
-  });
-}
+  },
+);
 
 test('test makeObjectSerializable and deserializeShallowObject function for Map of Sets', () => {
   const map = new Map([
diff --git a/desktop/jest.config.js b/desktop/jest.config.js
index 9cfd95007..4bd0a1067 100644
--- a/desktop/jest.config.js
+++ b/desktop/jest.config.js
@@ -13,6 +13,7 @@ module.exports = {
     '\\.(js|tsx?)$': '<rootDir>/scripts/jest-transform.js',
   },
   setupFiles: ['<rootDir>/scripts/jest-setup.js'],
+  setupFilesAfterEnv: ['<rootDir>/scripts/jest-setup-after.js'],
   moduleNameMapper: {
     '^flipper$': '<rootDir>/app/src',
     '^flipper-plugin$': '<rootDir>/flipper-plugin/src',
diff --git a/desktop/scripts/jest-setup-after.js b/desktop/scripts/jest-setup-after.js
new file mode 100644
index 000000000..21aac4e1a
--- /dev/null
+++ b/desktop/scripts/jest-setup-after.js
@@ -0,0 +1,33 @@
+/**
+ * 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
+ */
+
+// jest-setup-after will run after Jest has been initialized, so that it can be adapted.
+
+const test = global.test;
+if (!test) {
+  throw new Error('Failed jest test object');
+}
+/**
+ * This test will not be executed on Github / SandCastle,
+ * since, for example, it relies on precise timer reliability
+ */
+test.local = function local() {
+  const fn = process.env.SANDCASTLE || process.env.CI ? test.skip : test;
+  // eslint-disable-next-line
+  return fn.apply(null, arguments);
+};
+
+/**
+ * This test will only run on non-windows machines
+ */
+test.unix = function local() {
+  const fn = process.platform === 'win32' ? test.skip : test;
+  // eslint-disable-next-line
+  return fn.apply(null, arguments);
+};
diff --git a/desktop/types/index.d.ts b/desktop/types/index.d.ts
index 41b409a7e..3745ea231 100644
--- a/desktop/types/index.d.ts
+++ b/desktop/types/index.d.ts
@@ -26,3 +26,4 @@
 /// <reference path="nodejs.d.ts" />
 /// <reference path="npm-api.d.ts" />
 /// <reference path="openssl-wrapper.d.ts" />
+/// <reference path="jest-extensions.d.ts" />
diff --git a/desktop/types/jest-extensions.d.ts b/desktop/types/jest-extensions.d.ts
new file mode 100644
index 000000000..7043d44fb
--- /dev/null
+++ b/desktop/types/jest-extensions.d.ts
@@ -0,0 +1,22 @@
+/**
+ * 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
+ */
+
+declare namespace jest {
+  interface It {
+    /**
+     * This test will not be executed on Github / SandCastle,
+     * since, for example, it relies on precise timer reliability
+     */
+    local: jest.It;
+    /**
+     * This test will only run on non-windows machines
+     */
+    unix: jest.It;
+  }
+}