Use a Collection instead of a List to hold the command and arguments

src/main/java/rife/bld/extension/ExecOperation.java

@@ -37,7 +37,7 @@
  */
 public class ExecOperation extends AbstractOperation<ExecOperation> {
     private static final Logger LOGGER = Logger.getLogger(ExecOperation.class.getName());
-    private final List<String> args_ = new ArrayList<>();
+    private final Collection<String> args_ = new ArrayList<>();
     private boolean failOnExit_ = true;
     private BaseProject project_;
     private int timeout_ = 30;
@@ -61,6 +61,16 @@ public ExecOperation command(String... arg) {
         return this;
     }
 
+    /**
+     * Returns the command and arguments to be executed.
+     *
+     * @return the command and arguments
+     */
+    public Collection<String> command() {
+        return args_;
+    }
+
+
     /**
      * Configures the command and arguments to be executed.
      *
@@ -92,7 +102,7 @@ public void execute() throws Exception {
         if (workDir.isDirectory()) {
             var pb = new ProcessBuilder();
             pb.inheritIO();
-            pb.command(args_);
+            pb.command(args_.stream().toList());
             pb.directory(workDir);
 
             if (LOGGER.isLoggable(Level.INFO)) {

src/test/java/rife/bld/extension/ExecOperationTest.java

@@ -31,16 +31,10 @@ class ExecOperationTest {
     private static final String FOO = "foo";
 
     @Test
-    void testCat() throws Exception {
-        var tmpFile = new File("hello.tmp");
-        tmpFile.deleteOnExit();
-        new ExecOperation()
-                .fromProject(new Project())
-                .timeout(10)
-                .command("touch", tmpFile.getName())
-                .execute();
-
-        assertThat(tmpFile).exists();
+    void testCommand() {
+        var op = new ExecOperation().fromProject(new WebProject())
+                .command(FOO, "bar");
+        assertThat(op.command()).isEqualTo(List.of(FOO, "bar"));
     }
 
     @Test