Add a getter for arguments in ParamFileActionInput.

Expand `DummyExecutor` to allow customizing `BugReporter` and `ShowSubcommands` for tests.

PiperOrigin-RevId: 427875824

src/main/java/com/google/devtools/build/lib/actions/CommandLines.java

@@ -315,6 +315,10 @@ public String getExecPathString() {
     public PathFragment getExecPath() {
       return paramFileExecPath;
     }
+
+    public ImmutableList<String> getArguments() {
+      return ImmutableList.copyOf(arguments);
+    }
   }
 
   // Helper function to unpack the optimized storage format into a list

src/test/java/com/google/devtools/build/lib/actions/util/DummyExecutor.java

@@ -28,15 +28,33 @@
 public class DummyExecutor implements Executor {
 
   private final FileSystem fileSystem;
+  private final BugReporter bugReporter;
   private final Path inputDir;
   private final ManualClock clock = new ManualClock();
   @Nullable private final OptionsProvider optionsProvider;
+  @Nullable private final ShowSubcommands showSubcommands;
 
   public DummyExecutor(
-      FileSystem fileSystem, Path inputDir, @Nullable OptionsProvider optionsProvider) {
+      FileSystem fileSystem,
+      BugReporter bugReporter,
+      Path inputDir,
+      @Nullable OptionsProvider optionsProvider,
+      @Nullable ShowSubcommands showSubcommands) {
     this.fileSystem = fileSystem;
+    this.bugReporter = bugReporter;
     this.inputDir = inputDir;
     this.optionsProvider = optionsProvider;
+    this.showSubcommands = showSubcommands;
+  }
+
+  public DummyExecutor(
+      FileSystem fileSystem, Path inputDir, @Nullable OptionsProvider optionsProvider) {
+    this(
+        fileSystem,
+        BugReporter.defaultInstance(),
+        inputDir,
+        optionsProvider,
+        /*showSubcommands=*/ null);
   }
 
   public DummyExecutor(FileSystem fileSystem, Path inputDir) {
@@ -64,7 +82,7 @@ public Clock getClock() {
 
   @Override
   public BugReporter getBugReporter() {
-    return BugReporter.defaultInstance();
+    return bugReporter;
   }
 
   @Override
@@ -82,6 +100,9 @@ public OptionsProvider getOptions() {
 
   @Override
   public ShowSubcommands reportsSubcommands() {
+    if (showSubcommands != null) {
+      return showSubcommands;
+    }
     throw new UnsupportedOperationException();
   }
 }