Example for Unit Test (#52)

unit_testing/README.md

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+# unit_testing
+
+A flutter example app to demonstrate unit testing.
+
+<p>
+  <img src="example/exp.gif" width="" height = "300">
+</p>
+
+
+# Unit Test
+
+Unit tests are handy for verifying the behavior of a single function, method, or class. [click here](https://flutter.dev/docs/cookbook/testing/unit/introduction) for more information.
+
+## Getting Started
+
+This project is a starting point for a Flutter application.
+
+A few resources to get you started if this is your first Flutter project:
+
+- [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab)
+- [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook)
+
+For help getting started with Flutter, view our
+[online documentation](https://flutter.dev/docs), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.