Add junit tests for utils classes

src/test/java/stirling/software/SPDF/utils/ProcessExecutorTest.java

@@ -0,0 +1,51 @@
+package stirling.software.SPDF.utils;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class ProcessExecutorTest {
+
+    private ProcessExecutor processExecutor;
+
+    @BeforeEach
+    public void setUp() {
+        // Initialize the ProcessExecutor instance
+        processExecutor = ProcessExecutor.getInstance(ProcessExecutor.Processes.LIBRE_OFFICE);
+    }
+
+    @Test
+    public void testRunCommandWithOutputHandling() throws IOException, InterruptedException {
+        // Mock the command to execute
+        List<String> command = new ArrayList<>();
+        command.add("java");
+        command.add("-version");
+
+        // Execute the command
+        ProcessExecutor.ProcessExecutorResult result = processExecutor.runCommandWithOutputHandling(command);
+
+        // Check the exit code and output messages
+        assertEquals(0, result.getRc());
+        assertNotNull(result.getMessages()); // Check if messages are not null
+    }
+
+    @Test
+    public void testRunCommandWithOutputHandling_Error() {
+        // Mock the command to execute
+        List<String> command = new ArrayList<>();
+        command.add("nonexistent-command");
+
+        // Execute the command and expect an IOException
+        IOException thrown = assertThrows(IOException.class, () -> {
+            processExecutor.runCommandWithOutputHandling(command);
+        });
+
+        // Check the exception message to ensure it is about the nonexistent command
+        assertTrue(thrown.getMessage().contains("CreateProcess error=2, The system cannot find the file specified"));
+    }
+}