Some fixes for the testsuite

With these fixes, unit tests pass with MacOS
(set DYLD_LIBRARY_PATH!)

1.) MacOS takes popen vs. pclose seriously
By using fopen we basically spoil the system and other popen
won't work.

2.) For system integrity, MacOS does not propagate DYLD_LIBRARY_PATH
to child processes such as sh. This has to be done explictly.

3.) Search the klayout binary in the right path (klayout.app/...)

4.) Reset KLAYOUT_HOME for less intervention by installed macros

src/buddies/unit_tests/bdStrmrunTests.cc

@@ -30,10 +30,25 @@ TEST(1)
   std::string fp (tl::testsrc ());
   fp += "/testdata/bd/strmrun.py";
 
-  std::string path = tl::combine_path (tl::get_inst_path (), "strmrun ") + fp;
-  tl::InputPipe pipe (path);
+  std::string cmd;
+
+#if defined(__APPLE__)
+  //  NOTE: because of system integrity, MacOS does not inherit DYLD_LIBRARY_PATH to child
+  //  processes like sh. We need to port this variable explicitly.
+  const char *ldpath_name = "DYLD_LIBRARY_PATH";
+  const char *ldpath = getenv (ldpath_name);
+  if (ldpath) {
+    cmd += std::string (ldpath_name) + "=\"" + ldpath + "\"; export " + ldpath_name + "; ";
+  }
+#endif
+
+  cmd += tl::combine_path (tl::get_inst_path (), "strmrun ") + fp;
+  tl::info << cmd;
+
+  tl::InputPipe pipe (cmd);
   tl::InputStream is (pipe);
   std::string data = is.read_all ();
+  tl::info << data;
 
   EXPECT_EQ (data, "Hello, world (0,-42;42,0)!\n");
 }

src/pymod/unit_tests/pymod_tests.cc

@@ -53,7 +53,20 @@ int run_pymodtest (tl::TestBase *_this, const std::string &fn)
 
   std::string text;
   {
-    std::string cmd = std::string ("\"") + STRINGIFY (PYTHON) + "\" " + fp + " 2>&1";
+    std::string cmd;
+
+#if defined(__APPLE__)
+    //  NOTE: because of system integrity, MacOS does not inherit DYLD_LIBRARY_PATH to child
+    //  processes like sh. We need to port this variable explicitly.
+    const char *ldpath_name = "DYLD_LIBRARY_PATH";
+    const char *ldpath = getenv (ldpath_name);
+    if (ldpath) {
+      cmd += std::string (ldpath_name) + "=\"" + ldpath + "\"; export " + ldpath_name + "; ";
+    }
+#endif
+
+    cmd += std::string ("\"") + STRINGIFY (PYTHON) + "\" " + fp + " 2>&1";
+    
     tl::info << cmd;
     tl::InputPipe pipe (cmd);
     tl::InputStream is (pipe);

src/tl/tl/tlStream.cc

@@ -967,7 +967,8 @@ void
 InputPipe::close ()
 {
   if (m_file != NULL) {
-    fclose (m_file);
+    pclose (m_file);
+    //  TODO: pclose delivers the exit code - we should indicate it as return value of close.
     m_file = NULL;
   }
 }

testdata/klayout_main/main.rb

@@ -30,8 +30,25 @@ load("test_prologue.rb")
 
 class KLayoutMain_TestClass < TestBase
 
+  def setup
+    @klayout_home_name = "KLAYOUT_HOME"
+    @klayout_home = ENV[@klayout_home_name]
+    # setting "KLAYOUT_HOME" to empty means we don't search any place
+    # for macros
+    ENV[@klayout_home_name] = ""
+  end
+
+  def teardown
+    ENV[@klayout_home_name] = @klayout_home
+  end
+
   def klayout_bin
-    File.join(RBA::Application::instance.inst_path, "klayout")
+    # special location for MacOS
+    file = File.join(RBA::Application::instance.inst_path, "klayout.app", "Contents", "MacOS", "klayout")
+    if !File.exists?(file)
+      file = File.join(RBA::Application::instance.inst_path, "klayout")
+    end
+    return file
   end
 
   def test_1