bpo-35233: InitConfigTests tests more config vars (GH-10541)

test_embed.InitConfigTests tests more configuration variables.

Changes:

* InitConfigTests tests more core configuration variables:

  * base_exec_prefix
  * base_prefix
  * exec_prefix
  * home
  * legacy_windows_fs_encoding
  * legacy_windows_stdio
  * module_search_path_env
  * prefix

* "_testembed init_from_config" tests more variables:

  * argv
  * warnoptions
  * xoptions

* InitConfigTests: add check_global_config(), check_core_config() and
  check_main_config() subfunctions to cleanup the code. Move also
  constants at the class level (ex: COPY_MAIN_CONFIG).
* Fix _PyCoreConfig_AsDict(): don't set stdio_encoding twice
* Use more macros in _PyCoreConfig_AsDict() and
  _PyMainInterpreterConfig_AsDict() to reduce code duplication.
* Other minor cleanups.

1 files changed, 29 insertions, 3 deletions

diff --git a/Programs/_testembed.c b/Programs/_testembed.c
index 12dc0f98be..22212bff52 100644
--- a/Programs/_testembed.c
+++ b/Programs/_testembed.c
@@ -355,6 +355,7 @@ error:
     return -1;
 }
 
+
 static void
 dump_config(void)
 {
@@ -468,10 +469,30 @@ static int test_init_from_config(void)
     Py_SetProgramName(L"./globalvar");
     config.program_name = L"./conf_program_name";
 
-    /* FIXME: test argc/argv */
+    static wchar_t* argv[2] = {
+        L"-c",
+        L"pass",
+    };
+    config.argc = Py_ARRAY_LENGTH(argv);
+    config.argv = argv;
+
     config.program = L"conf_program";
-    /* FIXME: test xoptions */
-    /* FIXME: test warnoptions */
+
+    static wchar_t* xoptions[3] = {
+        L"core_xoption1=3",
+        L"core_xoption2=",
+        L"core_xoption3",
+    };
+    config.nxoption = Py_ARRAY_LENGTH(xoptions);
+    config.xoptions = xoptions;
+
+    static wchar_t* warnoptions[2] = {
+        L"default",
+        L"error::ResourceWarning",
+    };
+    config.nwarnoption = Py_ARRAY_LENGTH(warnoptions);
+    config.warnoptions = warnoptions;
+
     /* FIXME: test module_search_path_env */
     /* FIXME: test home */
     /* FIXME: test path config: module_search_path .. dll_path */
@@ -512,6 +533,11 @@ static int test_init_from_config(void)
 
     putenv("PYTHONIOENCODING=cp424");
     Py_SetStandardStreamEncoding("ascii", "ignore");
+#ifdef MS_WINDOWS
+    /* Py_SetStandardStreamEncoding() sets Py_LegacyWindowsStdioFlag to 1.
+       Force it to 0 through the config. */
+    config.legacy_windows_stdio = 0;
+#endif
     config.stdio_encoding = "iso8859-1";
     config.stdio_errors = "replace";