Rewrite qInstallMsgHandler test in C++

* Allows tests independent of debug settings for Qt
* Allows testing behavior unreachable from Ruby

test/testignoredebugoutput.cpp

@@ -0,0 +1,45 @@
+#include <QtTest/QtTest>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include "../src/IgnoreDebugOutput.h"
+
+#define MAX_LEN 40
+
+class TestIgnoreDebugOutput: public QObject {
+  Q_OBJECT
+
+  private slots:
+    void testIgnoreDebugOutput();
+};
+
+void TestIgnoreDebugOutput::testIgnoreDebugOutput() {
+  char buffer[MAX_LEN+1] = {0};
+  int out_pipe[2];
+  int saved_stdout;
+
+  saved_stdout = dup(STDOUT_FILENO);
+
+  QVERIFY(pipe(out_pipe) == 0);
+
+  dup2(out_pipe[1], STDOUT_FILENO);
+  close(out_pipe[1]);
+
+  long flags = fcntl(out_pipe[0], F_GETFL);
+  flags |= O_NONBLOCK;
+  fcntl(out_pipe[0], F_SETFL, flags);
+
+  ignoreDebugOutput();
+
+  qDebug() << "Message";
+  fflush(stdout);
+
+  read(out_pipe[0], buffer, MAX_LEN);
+
+  dup2(saved_stdout, STDOUT_FILENO);
+
+  QCOMPARE(QString(buffer), QString(""));
+}
+
+QTEST_MAIN(TestIgnoreDebugOutput)
+#include "testignoredebugoutput.moc"

test/testwebkitserver.pro

@@ -0,0 +1,5 @@
+SOURCES = testignoredebugoutput.cpp
+OBJECTS += ../src/IgnoreDebugOutput.o
+QT += testlib
+CONFIG += testcase console
+CONFIG -= app_bundle