test: add rootfs argument to ImageBuildResult

We'll use the rootfs argument of the test case to determine the
partitions that are expected when verifying the built image.

In the future it might be more convenient to include the whole
configuration in the ImageBuildResult to perform more functional tests
on the image.

test/test_build.py

@@ -36,6 +36,7 @@ class ImageBuildResult(NamedTuple):
     img_path: str
     img_arch: str
     container_ref: str
+    rootfs: str
     username: str
     password: str
     ssh_keyfile_private_path: str
@@ -159,7 +160,7 @@ def build_images(shared_tmpdir, build_container, request, force_aws_upload):
             journal_output = journal_log_path.read_text(encoding="utf8")
             bib_output = bib_output_path.read_text(encoding="utf8")
             results.append(ImageBuildResult(
-                image_type, generated_img, tc.target_arch, tc.container_ref,
+                image_type, generated_img, tc.target_arch, tc.container_ref, tc.rootfs,
                 username, password, ssh_keyfile_private_path,
                 kargs, bib_output, journal_output))
 
@@ -299,7 +300,7 @@ def del_ami():
     results = []
     for image_type in image_types:
         results.append(ImageBuildResult(
-            image_type, artifact[image_type], tc.target_arch, tc.container_ref,
+            image_type, artifact[image_type], tc.target_arch, tc.container_ref, tc.rootfs,
             username, password, ssh_keyfile_private_path,
             kargs, bib_output, journal_output, metadata))
     yield results