Move litho plugin tests

Summary:
I missed these. :(

Open source CI is unhappy about this - for good reasons.

Reviewed By: jknoxville

Differential Revision: D17500071

fbshipit-source-id: 96106f660dee59985c51e2635321ab4ad00a795a

android/plugins/litho/build.gradle

@@ -26,6 +26,9 @@ android {
         implementation deps.lithoWidget
         implementation deps.supportAppCompat
         compileOnly deps.jsr305
+
+        testImplementation deps.junit
+        testImplementation deps.robolectric
     }
 }
 

android/plugins/litho/src/test/java/com/facebook/flipper/plugins/sections/SectionsFlipperPluginTest.java

@@ -0,0 +1,26 @@
+/*
+ *  Copyright (c) 2018-present, Facebook, Inc.
+ *
+ *  This source code is licensed under the MIT license found in the LICENSE
+ *  file in the root directory of this source tree.
+ *
+ */
+package com.facebook.flipper.plugins.sections;
+
+import com.facebook.flipper.testing.FlipperConnectionMock;
+import com.facebook.flipper.testing.FlipperResponderMock;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+
+@RunWith(RobolectricTestRunner.class)
+public class SectionsFlipperPluginTest {
+  @Test
+  public void greetingTest() throws Exception {
+    final SectionsFlipperPlugin plugin = new SectionsFlipperPlugin(true);
+    final FlipperConnectionMock connection = new FlipperConnectionMock();
+    final FlipperResponderMock responder = new FlipperResponderMock();
+
+    plugin.onConnect(connection);
+  }
+}