Autogen: Add AUTOMOC test /w file(Generate)

Fixes: #20382

Tests/QtAutogen/AutoMocGeneratedFile/CMakeLists.txt

@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 3.26)
+project(AutoMocGeneratedFile)
+
+include("../AutogenCoreTest.cmake")
+
+file(GENERATE OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/myConfig.h
+    CONTENT
+    "
+#ifndef MYCONFIG_H
+#define MYCONFIG_H
+
+inline void foo() {}
+
+#endif
+
+"
+)
+
+add_executable(testTarget
+  main.cpp
+  ${CMAKE_CURRENT_BINARY_DIR}/myConfig.h)
+target_include_directories(testTarget PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
+set_property(TARGET testTarget PROPERTY AUTOMOC ON)

Tests/QtAutogen/AutoMocGeneratedFile/main.cpp

@@ -0,0 +1,7 @@
+#include "myConfig.h"
+
+int main()
+{
+  foo();
+  return 0;
+}

Tests/QtAutogen/Tests.cmake

@@ -2,6 +2,7 @@
 ADD_AUTOGEN_TEST(AutogenOriginDependsOff autogenOriginDependsOff)
 ADD_AUTOGEN_TEST(AutogenOriginDependsOn)
 ADD_AUTOGEN_TEST(AutogenTargetDepends)
+ADD_AUTOGEN_TEST(AutoMocGeneratedFile)
 ADD_AUTOGEN_TEST(Complex QtAutogen)
 ADD_AUTOGEN_TEST(GlobalAutogenSystemUseInclude)
 ADD_AUTOGEN_TEST(GlobalAutogenTarget)