Add testcase to Automorphic Number Algorithm (TheAlgorithms#3166)

Author: Ankush263

src/test/java/com/thealgorithms/maths/AutomorphicNumberTest.java

@@ -0,0 +1,16 @@
+package com.thealgorithms.maths;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class AutomorphicNumberTest{
+
+    @Test
+    void testAutomorphicNumber(){
+        assertThat(AutomorphicNumber.isAutomorphic(625)).isTrue();
+        assertThat(AutomorphicNumber.isAutomorphic(144)).isFalse();
+        assertThat(AutomorphicNumber.isAutomorphic(9376)).isTrue();
+        assertThat(AutomorphicNumber.isAutomorphic(169)).isFalse();
+    }
+}