add tests for date fix

opensrp-chw/src/lmh/java/org/smartregister/chw/fragment/BaseHomeVisitImmunizationFragmentFlv.java

@@ -6,6 +6,7 @@
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
 
 import org.smartregister.chw.anc.contract.BaseAncHomeVisitContract;
 import org.smartregister.chw.anc.domain.VaccineDisplay;
@@ -43,12 +44,17 @@ public static BaseHomeVisitImmunizationFragmentFlv getInstance(final BaseAncHome
 
     @Override
     public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
-        DatePickerUtils.themeDatePicker(singleDatePicker, new char[]{'d', 'm', 'y'});
+        callDatePickerUtilsThemeDatePicker(singleDatePicker, new char[]{'d', 'm', 'y'});
         super.onViewCreated(view, savedInstanceState);
     }
 
+    @VisibleForTesting
+    void callDatePickerUtilsThemeDatePicker(DatePicker datePicker, char[] ymdOrder){
+        DatePickerUtils.themeDatePicker(datePicker, ymdOrder);
+    }
+
     @Override
     protected void setDatePickerTheme(DatePicker picker) {
-        DatePickerUtils.themeDatePicker(picker, new char[]{'d', 'm', 'y'});
+        callDatePickerUtilsThemeDatePicker(picker, new char[]{'d', 'm', 'y'});
     }
 }

opensrp-chw/src/testLmh/java/org/smartregister/chw/fragment/BaseHomeVisitImmunizationFragmentFlvTest.java

@@ -0,0 +1,36 @@
+package org.smartregister.chw.fragment;
+
+import android.widget.DatePicker;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.AdditionalMatchers;
+import org.mockito.Spy;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doNothing;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.MockitoAnnotations.initMocks;
+
+public class BaseHomeVisitImmunizationFragmentFlvTest  {
+
+    @Spy
+    BaseHomeVisitImmunizationFragmentFlv fragmentFlv;
+
+    @Before
+    public void setUp(){
+        initMocks(this);
+    }
+
+    @Test
+    public void testSetDatePickerThemeSetsCorrectFormat() {
+        DatePicker datePicker = mock(DatePicker.class);
+        doNothing().when(fragmentFlv).callDatePickerUtilsThemeDatePicker(any(), any());
+        fragmentFlv.setDatePickerTheme(datePicker);
+        verify(fragmentFlv).callDatePickerUtilsThemeDatePicker(eq(datePicker), AdditionalMatchers.aryEq(new char[]{'d', 'm', 'y'}));
+    }
+
+
+}