Fixed an issue when configuration file options partly ignored when `--project-conf` // Resolve #3034 (#3055)

* Fixed an issue when configuration file options partly ignored when using custom ``--project-conf`` // Resolve #3034

* Py2 compatible makedirs

* Fix circle dependency

* Fix broken import in test examples

* Fix history

* Remove YAPF markers

* PyLint fix

* Fix invalid project conf path

* Move PIO Core to the root on Windows, issue with long CPPPATHs

* Respect global PLATFORMIO_BUILD_CACHE_DIR env var

* Fix Appveyor paths

* Minor changes

platformio/test/native.py

@@ -14,9 +14,8 @@
 
 from os.path import join
 
-from platformio import fs, proc
+from platformio import proc
 from platformio.proc import LineBufferedAsyncPipe
-from platformio.project.helpers import get_project_build_dir
 from platformio.test.processor import TestProcessorBase
 
 
@@ -32,8 +31,7 @@ class NativeTestProcessor(TestProcessorBase):
         return self.run()
 
     def run(self):
-        with fs.cd(self.options["project_dir"]):
-            build_dir = get_project_build_dir()
+        build_dir = self.options["project_config"].get_optional_dir("build")
         result = proc.exec_command(
             [join(build_dir, self.env_name, "program")],
             stdout=LineBufferedAsyncPipe(self.on_run_out),

platformio/test/processor.py

@@ -20,7 +20,6 @@ from string import Template
 import click
 
 from platformio import exception
-from platformio.project.helpers import get_project_test_dir
 
 TRANSPORT_OPTIONS = {
     "arduino": {
@@ -104,7 +103,9 @@ class TestProcessorBase(object):
 
     def build_or_upload(self, target):
         if not self._outputcpp_generated:
-            self.generate_outputcpp(get_project_test_dir())
+            self.generate_outputcpp(
+                self.options["project_config"].get_optional_dir("test")
+            )
             self._outputcpp_generated = True
 
         if self.test_name != "*":
@@ -175,7 +176,7 @@ class TestProcessorBase(object):
                 "   $end;",
                 "}",
             ]
-        )  # yapf: disable
+        )
 
         def delete_tmptest_file(file_):
             try: