diff --git a/tests/test_image.py b/tests/test_image.py
index e83198d..283c940 100644
--- a/tests/test_image.py
+++ b/tests/test_image.py
@@ -1,12 +1,14 @@
 import pytest
 from focker.image import validate_spec, \
-    build_squeeze
+    build_squeeze, \
+    build
 import subprocess
 from tempfile import TemporaryDirectory
 import focker.image
 import os
 from focker.zfs import zfs_find, \
-    zfs_mountpoint
+    zfs_mountpoint, \
+    zfs_exists_snapshot_sha256
 from focker.misc import focker_unlock
 
 
@@ -57,3 +59,35 @@ def test_build_squeeze(monkeypatch):
     assert os.path.exists(os.path.join(mountpoint, 'etc/hosts'))
     subprocess.check_output(['focker', 'image', 'remove', '-R', 'test-build-squeeze-base'])
     assert not os.path.exists(mountpoint)
+
+
+def test_build(monkeypatch):
+    focker_unlock()
+    subprocess.check_output(['focker', 'image', 'remove', '--force', '-R', 'test-build-squeeze-base'])
+    subprocess.check_output(['focker', 'bootstrap', '--dry-run', '-t', 'test-build-squeeze-base'])
+    spec = dict(base='test-build-squeeze-base', steps=[
+        dict(copy=['/etc/localtime', '/etc/localtime']),
+        dict(copy=['/etc/hosts', '/etc/hosts'])
+    ])
+    _, base_sha256 = zfs_find('test-build-squeeze-base', focker_type='image')
+
+    counter = 0
+    def count_calls(*args, **kwargs):
+        nonlocal counter
+        counter += 1
+        return zfs_exists_snapshot_sha256(*args, **kwargs)
+    monkeypatch.setattr(focker.image, 'zfs_exists_snapshot_sha256', count_calls)
+
+    with TemporaryDirectory() as d:
+        args = lambda: 0
+        args.focker_dir = d
+        name, _ = build(spec, args)
+
+    assert counter == 2
+    focker_unlock()
+    mountpoint = zfs_mountpoint(name.split('@')[0])
+    print('name:', name, 'mountpoint:', mountpoint)
+    assert os.path.exists(os.path.join(mountpoint, 'etc/localtime'))
+    assert os.path.exists(os.path.join(mountpoint, 'etc/hosts'))
+    subprocess.check_output(['focker', 'image', 'remove', '-R', 'test-build-squeeze-base'])
+    assert not os.path.exists(mountpoint)