Fix tests on Windows (#55)

* Fix run command with interpreter, fix test paths

Two problems fixed:
- Bug introduced in previous merge request that would crash Run by
  giving it a bad kwarg. Reverted to self.shell, but used the
  e3.sys.interpreter to be more flexible.
- Replaced the tests naming by setting a tests_subdir instead of a
  test_name method, which would crash Windows tests.

TN: V223-017

Author: Victor Verbeke

regtests/test_support.py

@@ -6,12 +6,6 @@
 import os
 import sys
 
-#  Change directory
-TEST = sys.modules["__main__"]
-TESTDIR = os.path.dirname(os.path.realpath(TEST.__file__))
-TEST_NAME = os.path.basename(TESTDIR)
-os.chdir(TESTDIR)
-
 
 def gprbuild(prj):
     """Compile a project with gprbuild"""

regtests/testsuite.py

@@ -12,6 +12,7 @@
 from e3.env import Env
 from e3.os.process import Run
 from e3.fs import mkdir, rm
+from e3.sys import interpreter
 
 import e3.testsuite
 from e3.testsuite import Testsuite
@@ -28,9 +29,14 @@ def run(self):
 
         Executes the test.py command inside the tests and compares the results.
         """
-        cmd = ["python", "test.py"]
+        cmd = [interpreter(), "test.py"]
         start_time = time.time()
-        run = Run(cmd, catch_error=False)
+        run = self.shell(
+            cmd,
+            cwd=self.test_env["working_dir"],
+            catch_error=False,
+            timeout=None,
+        )
         self.result.time = time.time() - start_time
 
 
@@ -40,10 +46,7 @@ class TPTestsuite(Testsuite):
     test_driver_map = {"basic": BasicTestDriver}
     default_driver = "basic"
 
-    def test_name(self, test_dir):
-        # Return the last directory name as the test name.
-        test_directory_name = test_dir.split("/")[-1]
-        return test_directory_name
+    tests_subdir = "tests"
 
     def __init__(self):
         super().__init__()