tests: Split the integration test into individual tests

unittest_inspector.py lists the tests in the integration-test.py script,
which are then added as individual tests.

tests/meson.build

@@ -1,10 +1,18 @@
-integration_test = find_program('integration-test.py')
-
 envs = environment()
 envs.set ('top_builddir', meson.build_root())
 envs.set ('top_srcdir', meson.source_root())
 
-test('iio-sensor-proxy-integration-test',
-  integration_test,
-  env: envs
-  )
+python3 = find_program('python3')
+unittest_inspector = find_program('unittest_inspector.py')
+r = run_command(unittest_inspector, files('integration-test.py'))
+unit_tests = r.stdout().strip().split('\n')
+
+foreach ut: unit_tests
+    ut_args = files('integration-test.py')
+    ut_args += ut
+    test(ut,
+         python3,
+         args: ut_args,
+         env: envs,
+        )
+endforeach

tests/unittest_inspector.py

@@ -0,0 +1,46 @@
+#! /usr/bin/env python3
+# Copyright © 2020, Canonical Ltd
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library. If not, see <http://www.gnu.org/licenses/>.
+# Authors:
+#       Marco Trevisan <marco.trevisan@canonical.com>
+
+import argparse
+import importlib.util
+import inspect
+import os
+import unittest
+
+def list_tests(module):
+    tests = []
+    for name, obj in inspect.getmembers(module):
+        if inspect.isclass(obj) and issubclass(obj, unittest.TestCase):
+            cases = unittest.defaultTestLoader.getTestCaseNames(obj)
+            tests += [ (obj, '{}.{}'.format(name, t)) for t in cases ]
+    return tests
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('unittest_source', type=argparse.FileType('r'))
+
+    args = parser.parse_args()
+    source_path = args.unittest_source.name
+    spec = importlib.util.spec_from_file_location(
+        os.path.basename(source_path), source_path)
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+
+    for machine, human in list_tests(module):
+        print(human)