Add minimalistic tests

* ensure that clang-tidy binary file exists and is executable
* run clang-tidy on a very simple C++ file

Fixes #1

.gitignore

@@ -180,3 +180,8 @@ install_manifest.txt
 compile_commands.json
 CTestTestfile.cmake
 _deps
+
+# scikit-build cache
+_skbuild/
+
+clang_tidy/data/

clang_tidy/__init__.py

@@ -6,15 +6,24 @@
 def _get_executable(name):
     return os.path.join(os.path.dirname(__file__), "data", "bin", name)
 
-def _run(name):
-    executable = _get_executable(name)
-    return subprocess.call([executable] + sys.argv[1:])
+def _run(name, *args):
+    command = [_get_executable(name)]
+    if args:
+        command += list(args)
+    else:
+        command += sys.argv[1:]
+    return subprocess.call(command)
+
+def _run_python(name, *args):
+    command = [sys.executable, _get_executable(name)]
+    if args:
+        command += list(args)
+    else:
+        command += sys.argv[1:]
 
-def _run_python(name):
-    script = _get_executable(name)
     # as MS Windows is not able to run Python scripts directly by name,
     # we have to call the interpreter and pass the script as parameter
-    return subprocess.call([sys.executable, script] + sys.argv[1:])
+    return subprocess.call(command)
 
 
 def clang_tidy():

test/test_executable.py

@@ -0,0 +1,21 @@
+import os
+import tempfile
+
+import clang_tidy
+
+
+def test_executable_file():
+    exe = clang_tidy._get_executable("clang-tidy")
+    assert os.path.exists(exe), "'clang-tidy' executable is missing"
+    assert os.access(exe, os.X_OK), "'clang-tidy'program is not executable"
+
+
+def test_include_iostream():
+    fd, compilation_unit = tempfile.mkstemp(suffix=".cpp")
+    os.close(fd)
+    with open(compilation_unit, "w") as ostr:
+        ostr.write("#include <iostream>\n")
+    try:
+        assert clang_tidy._run("clang-tidy", compilation_unit) == 0
+    finally:
+        os.remove(compilation_unit)