[#1125][#1538] add test for option name or subcommand as option value

src/test/java/picocli/Issue1125_1538_OptionNameOrSubcommandAsOptionValue.java

@@ -0,0 +1,63 @@
+package picocli;
+
+import java.io.File;
+import java.util.Map;
+import java.util.Stack;
+import java.util.concurrent.Callable;
+
+import org.junit.Test;
+import picocli.CommandLine.Command;
+import picocli.CommandLine.IParameterPreprocessor;
+import picocli.CommandLine.Model.ArgSpec;
+import picocli.CommandLine.Model.CommandSpec;
+import picocli.CommandLine.Option;
+import picocli.CommandLine.ParameterException;
+
+import static org.junit.Assert.*;
+
+public class Issue1125_1538_OptionNameOrSubcommandAsOptionValue {
+    @Command(name = "mycommand")
+    static class MyCommand implements Callable<Integer> {
+
+        @Option(names = "-output", preprocessor = MyPreprocessor.class)
+        File output = new File(".");
+
+        static class MyPreprocessor implements IParameterPreprocessor {
+            public boolean preprocess(Stack<String> args, CommandSpec commandSpec, ArgSpec argSpec, Map<String, Object> info) {
+                if (args.isEmpty()) {
+                    throw new ParameterException(commandSpec.commandLine(), "Error: option '-output' requires a parameter");
+                }
+                String arg = args.pop();
+                //System.err.printf("Setting %s to '%s'%n", argSpec, arg);
+                argSpec.setValue(new File(arg));
+                return true;
+            }
+        }
+
+        public Integer call() {
+            return 11;
+        }
+
+        @Command(name = "mySubcommand")
+        public int mySubcommand() {
+            return 13;
+        }
+    }
+
+    @Test
+    public void testSubcommandAsOptionName() {
+        MyCommand obj = new MyCommand();
+        CommandLine cmdLine = new CommandLine(obj);
+        int exitCode = cmdLine.execute("-output", "abc", "mySubcommand");
+        assertEquals(13, exitCode);
+        assertEquals("abc", obj.output.getName());
+
+        exitCode = cmdLine.execute("-output=mySubcommand", "mySubcommand");
+        assertEquals(13, exitCode);
+        assertEquals("mySubcommand", obj.output.getName());
+
+        exitCode = cmdLine.execute("-output", "mySubcommand", "mySubcommand");
+        assertEquals(13, exitCode);
+        assertEquals("mySubcommand", obj.output.getName());
+    }
+}