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

tests/commands/test_check.py

@@ -164,7 +164,7 @@ def test_check_filter_sources(clirunner, check_dir):
     assert style == EXPECTED_STYLE
 
 
-def test_check_failed_if_no_source_files(clirunner, tmpdir):
+def test_check_no_source_files(clirunner, tmpdir):
     tmpdir.join("platformio.ini").write(DEFAULT_CONFIG)
     tmpdir.mkdir("src")
 
@@ -178,7 +178,7 @@ def test_check_failed_if_no_source_files(clirunner, tmpdir):
     assert style == 0
 
 
-def test_check_failed_if_bad_flag_passed(clirunner, check_dir):
+def test_check_bad_flag_passed(clirunner, check_dir):
     result = clirunner.invoke(
         cmd_check, ["--project-dir", str(check_dir), '"--flags=--UNKNOWN"']
     )

tests/test_examples.py

@@ -22,7 +22,6 @@ import pytest
 from platformio import util
 from platformio.managers.platform import PlatformFactory, PlatformManager
 from platformio.project.config import ProjectConfig
-from platformio.project.helpers import get_project_build_dir
 
 
 def pytest_generate_tests(metafunc):
@@ -71,11 +70,12 @@ def pytest_generate_tests(metafunc):
 @pytest.mark.examples
 def test_run(pioproject_dir):
     with util.cd(pioproject_dir):
-        build_dir = get_project_build_dir()
+        config = ProjectConfig()
+        build_dir = config.get_optional_dir("build")
         if isdir(build_dir):
             util.rmtree_(build_dir)
 
-        env_names = ProjectConfig(join(pioproject_dir, "platformio.ini")).envs()
+        env_names = config.envs()
         result = util.exec_command(
             ["platformio", "run", "-e", random.choice(env_names)]
         )

tests/test_projectconf.py

@@ -112,6 +112,15 @@ def test_warnings(config):
         config.validate(["non-existing-env"])
 
 
+def test_defaults(config):
+    assert config.get_optional_dir("core") == os.path.join(
+        os.path.expanduser("~"), ".platformio"
+    )
+    assert config.get_optional_dir("build_cache") == os.environ.get(
+        "PLATFORMIO_BUILD_CACHE_DIR"
+    )
+
+
 def test_sections(config):
     with pytest.raises(ConfigParser.NoSectionError):
         config.getraw("unknown_section", "unknown_option")