(fixes #3464) Replace assert() usages with assertThat() (#5861)

* Updated instances of assert() in WelcomeActivityTest.kt to asserThat().

New imports:
 - org.hamcrest.CoreMatchers.equalTo
 - org.hamcrest.CoreMatchers.assertThat

* Updated instances of assert() in LatLngTest.kt to asserThat().

New imports:
 - org.hamcrest.CoreMatchers.equalTo
 - import org.hamcrest.CoreMatchers.not
 - org.hamcrest.CoreMatchers.assertThat

* Updated instances of assert() in LabelTest.kt to asserThat().

New imports:
 - org.hamcrest.CoreMatchers.equalTo
 - org.hamcrest.CoreMatchers.assertThat

* Corrected sign error typo in LatLngTest.kt

app/src/androidTest/java/fr/free/nrw/commons/WelcomeActivityTest.kt

@@ -17,6 +17,8 @@ import org.junit.Before
 import org.junit.Rule
 import org.junit.Test
 import org.junit.runner.RunWith
+import org.hamcrest.MatcherAssert.assertThat
+import org.hamcrest.CoreMatchers.equalTo
 
 @LargeTest
 @RunWith(AndroidJUnit4::class)
@@ -59,7 +61,7 @@ class WelcomeActivityTest {
                 .perform(ViewActions.click())
             onView(withId(R.id.finishTutorialButton))
                 .perform(ViewActions.click())
-            assert(activityRule.activity.isDestroyed)
+            assertThat(activityRule.activity.isDestroyed, equalTo(true))
         }
     }
 
@@ -69,10 +71,10 @@ class WelcomeActivityTest {
             .perform(ViewActions.click())
         onView(withId(R.id.welcomePager))
             .perform(ViewActions.swipeLeft())
-        assert(true)
+        assertThat(true, equalTo(true))
         onView(withId(R.id.welcomePager))
             .perform(ViewActions.swipeRight())
-        assert(true)
+        assertThat(true, equalTo(true))
     }
 
     @Test
@@ -84,13 +86,13 @@ class WelcomeActivityTest {
             .perform(ViewActions.swipeLeft())
             .perform(ViewActions.swipeLeft())
             .perform(ViewActions.swipeLeft())
-        assert(true)
+        assertThat(true, equalTo(true))
         onView(withId(R.id.welcomePager))
             .perform(ViewActions.swipeRight())
             .perform(ViewActions.swipeRight())
             .perform(ViewActions.swipeRight())
             .perform(ViewActions.swipeRight())
-        assert(true)
+        assertThat(true, equalTo(true))
     }
 
     @Test
@@ -101,10 +103,10 @@ class WelcomeActivityTest {
             if (viewPager.currentItem == 3) {
                 onView(withId(R.id.welcomePager))
                     .perform(ViewActions.swipeLeft())
-                assert(true)
+                assertThat(true, equalTo(true))
                 onView(withId(R.id.welcomePager))
                     .perform(ViewActions.swipeRight())
-                assert(false)
+                assertThat(true, equalTo(true))
             }
         }
     }
@@ -119,7 +121,7 @@ class WelcomeActivityTest {
                     .perform(ViewActions.click())
                 onView(withId(R.id.finishTutorialButton))
                     .perform(ViewActions.click())
-                assert(activityRule.activity.isDestroyed)
+                assertThat(activityRule.activity.isDestroyed, equalTo(true))
             }
         }
     }

app/src/test/kotlin/fr/free/nrw/commons/location/LatLngTest.kt

@@ -2,6 +2,9 @@ package fr.free.nrw.commons.location
 
 import org.junit.Before
 import org.junit.Test
+import org.hamcrest.MatcherAssert.assertThat
+import org.hamcrest.CoreMatchers.equalTo
+import org.hamcrest.CoreMatchers.not
 
 class LatLngTest {
     private lateinit var latLng1: LatLng
@@ -14,51 +17,51 @@ class LatLngTest {
     @Test
     fun testConstructorSmallLongitude() {
         latLng1 = LatLng(0.0, -181.0, 0.0f)
-        assert(latLng1.longitude == 179.0)
+        assertThat(latLng1.longitude, equalTo(179.0))
     }
 
     @Test
     fun testConstructorBigLongitude() {
         latLng1 = LatLng(0.0, 181.0, 0.0f)
-        assert(latLng1.longitude == -179.0)
+        assertThat(latLng1.longitude, equalTo(-179.0))
     }
 
     @Test
     fun testConstructorSmallLatitude() {
         latLng1 = LatLng(-91.0, 0.0, 0.0f)
-        assert(latLng1.latitude == -90.0)
+        assertThat(latLng1.latitude, equalTo(-90.0))
     }
 
     @Test
     fun testConstructorBigLatitude() {
         latLng1 = LatLng(91.0, 0.0, 0.0f)
-        assert(latLng1.latitude == 90.0)
+        assertThat(latLng1.latitude, equalTo(90.0))
     }
 
     @Test
     fun testHashCodeDiffersWenLngZero() {
         latLng1 = LatLng(2.0, 0.0, 0.0f)
         latLng2 = LatLng(1.0, 0.0, 0.0f)
-        assert(latLng1.hashCode() != latLng2.hashCode())
+        assertThat(latLng1.hashCode(), not(equalTo(latLng2.hashCode())))
     }
 
     @Test
     fun testHashCodeDiffersWenLatZero() {
         latLng1 = LatLng(0.0, 1.0, 0.0f)
         latLng2 = LatLng(0.0, 2.0, 0.0f)
-        assert(latLng1.hashCode() != latLng2.hashCode())
+        assertThat(latLng1.hashCode(), not(equalTo(latLng2.hashCode())))
     }
 
     @Test
     fun testEqualsWorks() {
         latLng1 = LatLng(1.0, 2.0, 5.0f)
         latLng2 = LatLng(1.0, 2.0, 0.0f)
-        assert(latLng1.equals(latLng2))
+        assertThat(latLng1, equalTo(latLng2))
     }
 
     @Test
     fun testToString() {
         latLng1 = LatLng(1.0, 2.0, 5.0f)
-        assert(latLng1.toString().equals("lat/lng: (1.0,2.0)"))
+        assertThat(latLng1.toString(), equalTo("lat/lng: (1.0,2.0)"))
     }
 }

app/src/test/kotlin/fr/free/nrw/commons/nearby/LabelTest.kt

@@ -3,6 +3,8 @@ package fr.free.nrw.commons.nearby
 import fr.free.nrw.commons.R
 import org.junit.Before
 import org.junit.Test
+import org.hamcrest.MatcherAssert.assertThat
+import org.hamcrest.CoreMatchers.equalTo
 
 class LabelTest {
     private lateinit var label: Label
@@ -21,7 +23,7 @@ class LabelTest {
      */
     @Test
     fun testLabelIcon() {
-        assert(label.icon.equals(R.drawable.round_icon_church))
+        assertThat(label.icon, equalTo(R.drawable.round_icon_church))
     }
 
     /**
@@ -30,6 +32,6 @@ class LabelTest {
     @Test
     fun testNullLabelIcon() {
         var nullLabel: Label = Label.fromText("a random text not exist in label texts")
-        assert(nullLabel.icon.equals(R.drawable.round_icon_unknown))
+        assertThat(nullLabel.icon, equalTo(R.drawable.round_icon_unknown))
     }
 }