Add test case for BinaryToOctal (#3696)

src/test/java/com/thealgorithms/conversions/BinaryToOctalTest.java

@@ -0,0 +1,14 @@
+package com.thealgorithms.conversions;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+public class BinaryToOctalTest {
+
+    @Test
+    public void testBinaryToOctal() {
+        assertEquals("226", BinaryToOctal.convertBinaryToOctal(10010110));
+        assertEquals("135", BinaryToOctal.convertBinaryToOctal(1011101));
+    }
+}