Test refactoring

The testing script is getting too big and not very well organized. In
this commit a new module `integration_tests` is introduced that contains
parts of the original testing script split into multiple files. The
content should be the same, the only difference is that now you can run
the tests by invoking `python3 -m test`.

test/integration_tests/run.py

@@ -0,0 +1,32 @@
+import contextlib
+import logging
+import subprocess
+import time
+
+from .config import *
+
+
+@contextlib.contextmanager
+def boot_image(file_name: str):
+    acceleration = ["-accel", "kvm:hvf:tcg"]
+    network = ["-net", "nic,model=rtl8139", "-net", "user,hostfwd=tcp::8888-:8888"]
+    cmd = ["qemu-system-x86_64", "-nographic", "-m", "1024", "-snapshot"] + \
+          acceleration + [f"{OUTPUT_DIR}/{file_name}"] + network
+    logging.info(f"Booting image: {cmd}")
+    vm = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    try:
+        time.sleep(EXPECTED_TIME_TO_BOOT)
+        yield None
+    finally:
+        vm.kill()
+
+
+@contextlib.contextmanager
+def extract_image(file_name: str):
+    extract_dir = tempfile.mkdtemp(prefix="osbuild-")
+    subprocess.run(["tar", "xf", f"{OUTPUT_DIR}/{file_name}"], cwd=extract_dir, check=True)
+    try:
+        yield extract_dir
+    finally:
+        # Clean up?
+        pass