8142927: Feed some text to STDIN in ProcessTools.executeProcess()

Reviewed-by: rriggs

test/lib/testlibrary/jdk/testlibrary/OutputAnalyzer.java

@@ -39,7 +39,7 @@ public final class OutputAnalyzer {
 
     private final String stdout;
     private final String stderr;
-    private final int exitValue;
+    private final int exitValue;    // useless now. output contains exit value.
 
     /**
      * Create an OutputAnalyzer, a utility class for verifying output and exit

test/lib/testlibrary/jdk/testlibrary/ProcessTools.java

 /*
- * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -25,6 +25,7 @@ package jdk.testlibrary;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.io.OutputStream;
 import java.io.PrintStream;
 import java.lang.management.ManagementFactory;
 import java.lang.management.RuntimeMXBean;
@@ -353,9 +354,31 @@ public final class ProcessTools {
      * @return The output from the process.
      */
     public static OutputAnalyzer executeProcess(ProcessBuilder pb) throws Throwable {
+        return executeProcess(pb, null);
+    }
+
+    /**
+     * Executes a process, pipe some text into its STDIN, waits for it
+     * to finish and returns the process output. The process will have exited
+     * before this method returns.
+     * @param pb The ProcessBuilder to execute.
+     * @param input The text to pipe into STDIN. Can be null.
+     * @return The {@linkplain OutputAnalyzer} instance wrapping the process.
+     */
+    public static OutputAnalyzer executeProcess(ProcessBuilder pb, String input)
+            throws Throwable {
         OutputAnalyzer output = null;
+        Process p = null;
         try {
-            output = new OutputAnalyzer(pb.start());
+            p = pb.start();
+            if (input != null) {
+                try (OutputStream os = p.getOutputStream();
+                        PrintStream ps = new PrintStream(os)) {
+                    ps.print(input);
+                    ps.flush();
+                }
+            }
+            output = new OutputAnalyzer(p);
             return output;
         } catch (Throwable t) {
             System.out.println("executeProcess() failed: " + t);