CppTools: Tests: Stop writing into source dir

Instead, always write into a unique temporary directory in
QDir::tempPath().

Where applicable, read the test source from files instead of first
writing the file.

Some clean ups in test_codegen*.

Change-Id: Id48dc50c6ca16252edfd9fc8a86ba0de9f9be486
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>

tests/auto/cplusplus/preprocessor/data/include-data/local/test_main_allDiagnostics.cpp

@@ -0,0 +1,3 @@
+#include <NotResolvable1>
+#include <NotResolvable2>
+#include "/some/nonexisting/file123.h"

tests/auto/cplusplus/preprocessor/data/include-data/local/test_main_detectIncludeGroupsByIncludeDir.cpp

@@ -0,0 +1,9 @@
+#include "file.h"
+#include "fileother.h"
+#include <lib/file.h>
+#include <lib/fileother.h>
+#include "otherlib/file.h"
+#include "otherlib/fileother.h"
+#include <iostream>
+#include <string>
+#include <except>

tests/auto/cplusplus/preprocessor/data/include-data/local/test_main_detectIncludeGroupsByIncludeType.cpp

@@ -0,0 +1,9 @@
+#include "file.h"
+#include "fileother.h"
+#include <lib/file.h>
+#include <lib/fileother.h>
+#include "otherlib/file.h"
+#include "otherlib/fileother.h"
+#include <iostream>
+#include <string>
+#include <except>

tests/auto/cplusplus/preprocessor/data/include-data/local/test_main_detectIncludeGroupsByNewLines.cpp

@@ -0,0 +1,24 @@
+#include "header.h"
+
+#include "file.h"
+#include "fileother.h"
+
+#include <lib/fileother.h>
+#include <lib/file.h>
+
+#include "otherlib/file.h"
+#include "otherlib/fileother.h"
+
+#include "utils/utils.h"
+
+#include <QDebug>
+#include <QDir>
+#include <QString>
+
+#include <iostream>
+#include <string>
+#include <except>
+
+#include <iostream>
+#include "stuff"
+#include <except>

tests/auto/cplusplus/preprocessor/data/include-data/local/test_main_macroUses.cpp

@@ -0,0 +1,4 @@
+#define SOMEDEFINE 1
+#if SOMEDEFINE == 1
+    int someNumber;
+#endif

tests/auto/cplusplus/preprocessor/data/include-data/local/test_main_resolvedUnresolved.cpp

@@ -0,0 +1,2 @@
+#include "header.h"
+#include "notresolvable.h"