write tests for streamer

aircox_streamer/tests/fake_modules/__init__.py

@@ -0,0 +1,39 @@
+import atexit as o_atexit
+import subprocess as o_subprocess
+import psutil as o_psutil
+
+from . import atexit, subprocess, psutil
+
+modules = [
+    (o_atexit, atexit, {}),
+    (o_subprocess, subprocess, {}),
+    (o_psutil, psutil, {}),
+]
+
+
+def init_mappings():
+    for original, spoof, mapping in modules:
+        if mapping:
+            continue
+        mapping.update(
+            {
+                attr: (getattr(original, attr, None), spoofed)
+                for attr, spoofed in vars(spoof).items()
+                if not attr.startswith("_") and hasattr(original, attr)
+            }
+        )
+
+
+def setup():
+    for original, spoof, mappings in modules:
+        for attr, (orig, spoofed) in mappings.items():
+            setattr(original, attr, spoofed)
+
+
+def setdown():
+    for original, spoof, mappings in modules:
+        for attr, (orig, spoofed) in mappings.items():
+            setattr(original, attr, orig)
+
+
+init_mappings()