Added ProcessLauncher and implementation.

src/test/groovy/net/rubygrapefruit/platform/ProcessLauncherTest.groovy

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2012 Adam Murdoch
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+package net.rubygrapefruit.platform
+
+import spock.lang.Specification
+
+class ProcessLauncherTest extends Specification {
+    final ProcessLauncher launcher = Native.get(ProcessLauncher)
+
+    def "can start a child process"() {
+        def javaHome = System.getProperty("java.home")
+        def exe = "${javaHome}/bin/java"
+        ProcessBuilder builder = new ProcessBuilder(exe, "-version")
+        builder.redirectErrorStream(true)
+
+        when:
+        def process = launcher.start(builder)
+        def stdout = new ByteArrayOutputStream()
+        def stdoutThread = process.consumeProcessOutputStream(stdout)
+        def result = process.waitFor()
+        stdoutThread.join()
+
+        then:
+        result == 0
+        stdout.toString().contains(System.getProperty('java.vm.version'))
+    }
+}