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diff --git a/demoapp/app/src/test/java/com/google/phonenumbers/demoapp/phonenumbers/PhoneNumberFormattingTest.java b/demoapp/app/src/test/java/com/google/phonenumbers/demoapp/phonenumbers/PhoneNumberFormattingTest.java
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+++ b/demoapp/app/src/test/java/com/google/phonenumbers/demoapp/phonenumbers/PhoneNumberFormattingTest.java
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+package com.google.phonenumbers.demoapp.phonenumbers;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+import com.google.phonenumbers.demoapp.phonenumbers.PhoneNumberInApp.FormattingState;
+import org.junit.Test;
+
+/** JUnit Tests for class {@link PhoneNumberFormatting}. */
+public class PhoneNumberFormattingTest {
+
+  @Test
+  public void formatPhoneNumberInApp_parsingError() {
+    PhoneNumberInApp phoneNumberInApp = new PhoneNumberInApp("19735", "Izabelle Goodwin", "#");
+
+    PhoneNumberFormatting.formatPhoneNumberInApp(phoneNumberInApp, "CH", false);
+
+    assertNull(phoneNumberInApp.getFormattedPhoneNumber());
+    assertEquals(FormattingState.PARSING_ERROR, phoneNumberInApp.getFormattingState());
+    assertFalse(phoneNumberInApp.shouldContactBeUpdated());
+  }
+
+  @Test
+  public void formatPhoneNumberInApp_numberIsShortNumber() {
+    PhoneNumberInApp phoneNumberInApp = new PhoneNumberInApp("2", "Beatrice Bradley", "144");
+
+    PhoneNumberFormatting.formatPhoneNumberInApp(phoneNumberInApp, "CH", false);
+
+    assertNull(phoneNumberInApp.getFormattedPhoneNumber());
+    assertEquals(FormattingState.NUMBER_IS_SHORT_NUMBER, phoneNumberInApp.getFormattingState());
+    assertFalse(phoneNumberInApp.shouldContactBeUpdated());
+  }
+
+  @Test
+  public void formatPhoneNumberInApp_invalidNumber() {
+    PhoneNumberInApp phoneNumberInApp =
+        new PhoneNumberInApp("1283", "Donte Salinas", "04466818029999");
+
+    PhoneNumberFormatting.formatPhoneNumberInApp(phoneNumberInApp, "CH", false);
+
+    assertNull(phoneNumberInApp.getFormattedPhoneNumber());
+    assertEquals(FormattingState.NUMBER_IS_NOT_VALID, phoneNumberInApp.getFormattingState());
+    assertFalse(phoneNumberInApp.shouldContactBeUpdated());
+  }
+
+  @Test
+  public void formatPhoneNumberInApp_numberIsAlreadyInE164() {
+    PhoneNumberInApp phoneNumberInApp =
+        new PhoneNumberInApp("345", "Kassandra Coffey", "+41446681804");
+
+    PhoneNumberFormatting.formatPhoneNumberInApp(phoneNumberInApp, "CH", false);
+
+    assertNull(phoneNumberInApp.getFormattedPhoneNumber());
+    assertEquals(FormattingState.NUMBER_IS_ALREADY_IN_E164, phoneNumberInApp.getFormattingState());
+    assertFalse(phoneNumberInApp.shouldContactBeUpdated());
+  }
+
+  @Test
+  public void
+      formatPhoneNumberInApp_originalWithWhitespace_ignoreWhitespaceTrue_numberIsAlreadyInE164() {
+    PhoneNumberInApp phoneNumberInApp =
+
+        new PhoneNumberInApp("443221", "Nayeli Martinez", "+41 446 68 18 07");
+    PhoneNumberFormatting.formatPhoneNumberInApp(phoneNumberInApp, "CH", true);
+
+    assertNull(phoneNumberInApp.getFormattedPhoneNumber());
+    assertEquals(FormattingState.NUMBER_IS_ALREADY_IN_E164, phoneNumberInApp.getFormattingState());
+    assertFalse(phoneNumberInApp.shouldContactBeUpdated());
+  }
+
+  @Test
+  public void formatPhoneNumberInApp_originalWithWhitespace_ignoreWhitespaceFalse_completed() {
+    PhoneNumberInApp phoneNumberInApp =
+        new PhoneNumberInApp("22", "Mariyah Johnston", "+41 446 68 18 05");
+
+    PhoneNumberFormatting.formatPhoneNumberInApp(phoneNumberInApp, "CH", false);
+
+    assertEquals("+41446681805", phoneNumberInApp.getFormattedPhoneNumber());
+    assertEquals(FormattingState.COMPLETED, phoneNumberInApp.getFormattingState());
+    assertTrue(phoneNumberInApp.shouldContactBeUpdated());
+  }
+
+  @Test
+  public void formatPhoneNumberInApp_completed() {
+    PhoneNumberInApp phoneNumberInAppCh = new PhoneNumberInApp("45", "Alena Potts", "0446681800");
+    PhoneNumberInApp phoneNumberInAppUs =
+        new PhoneNumberInApp("3829", "Rebecca Haimo", "9495550102");
+
+    PhoneNumberFormatting.formatPhoneNumberInApp(phoneNumberInAppCh, "CH", false);
+    PhoneNumberFormatting.formatPhoneNumberInApp(phoneNumberInAppUs, "US", false);
+
+    String expectedFormattedPhoneNumberCh = "+41446681800";
+    assertEquals(expectedFormattedPhoneNumberCh, phoneNumberInAppCh.getFormattedPhoneNumber());
+    assertEquals(FormattingState.COMPLETED, phoneNumberInAppCh.getFormattingState());
+    assertTrue(phoneNumberInAppCh.shouldContactBeUpdated());
+    String expectedFormattedPhoneNumberUs = "+19495550102";
+    assertEquals(expectedFormattedPhoneNumberUs, phoneNumberInAppUs.getFormattedPhoneNumber());
+    assertEquals(FormattingState.COMPLETED, phoneNumberInAppUs.getFormattingState());
+    assertTrue(phoneNumberInAppUs.shouldContactBeUpdated());
+  }
+}