diff --git a/app/src/androidTest/java/org/kiwix/kiwixmobile/testutils/Matcher.java b/app/src/androidTest/java/org/kiwix/kiwixmobile/testutils/Matcher.java
deleted file mode 100644
index 28022c283..000000000
--- a/app/src/androidTest/java/org/kiwix/kiwixmobile/testutils/Matcher.java
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * Kiwix Android
- * Copyright (c) 2019 Kiwix <android.kiwix.org>
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- */
-
-package org.kiwix.kiwixmobile.testutils;
-
-import android.view.View;
-import android.view.ViewGroup;
-import android.view.ViewParent;
-import org.hamcrest.Description;
-import org.hamcrest.TypeSafeMatcher;
-
-public class Matcher {
-  public static org.hamcrest.Matcher<View> childAtPosition(
-    final org.hamcrest.Matcher<View> parentMatcher, final int position) {
-    return new TypeSafeMatcher<View>() {
-      @Override
-      public void describeTo(Description description) {
-        description.appendText("Child at position " + position + " in parent ");
-        parentMatcher.describeTo(description);
-      }
-
-      @Override
-      public boolean matchesSafely(View view) {
-        ViewParent parent = view.getParent();
-        return parent instanceof ViewGroup && parentMatcher.matches(parent)
-          && view.equals(((ViewGroup) parent).getChildAt(position));
-      }
-    };
-  }
-}
diff --git a/app/src/androidTest/java/org/kiwix/kiwixmobile/testutils/Matcher.kt b/app/src/androidTest/java/org/kiwix/kiwixmobile/testutils/Matcher.kt
new file mode 100644
index 000000000..88c5e92b9
--- /dev/null
+++ b/app/src/androidTest/java/org/kiwix/kiwixmobile/testutils/Matcher.kt
@@ -0,0 +1,49 @@
+/*
+ * Kiwix Android
+ * Copyright (c) 2021 Kiwix <android.kiwix.org>
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+package org.kiwix.kiwixmobile.testutils
+
+import android.view.View
+import android.view.ViewGroup
+import org.hamcrest.Description
+import org.hamcrest.Matcher
+import org.hamcrest.TypeSafeMatcher
+
+class Matcher {
+  companion object {
+    @JvmStatic
+    fun childAtPosition(
+      parentMatcher: Matcher<View?>,
+      position: Int
+    ): Matcher<View> {
+      return object : TypeSafeMatcher<View>() {
+        override fun describeTo(description: Description) {
+          description.appendText("Child at position $position in parent ")
+          parentMatcher.describeTo(description)
+        }
+
+        public override fun matchesSafely(view: View): Boolean {
+          val parent = view.parent
+          return parent is ViewGroup && parentMatcher.matches(parent) && view == parent.getChildAt(
+              position
+            )
+        }
+      }
+    }
+  }
+}