aptly snapshot drop with system tests.

system/t05_snapshot/DropSnapshot1Test_gold

@@ -0,0 +1 @@
+Snapshot `snap1` has been dropped.

system/t05_snapshot/DropSnapshot1Test_snapshot_show

@@ -0,0 +1 @@
+ERROR: unable to show: snapshot with name snap1 not found

system/t05_snapshot/DropSnapshot2Test_gold

@@ -0,0 +1,3 @@
+Snapshot `snap1` was used as a source in following snapshots:
+ * [snap2]: Merged from sources: 'snap1'
+ERROR: won't delete snapshot that was used as source for other snapshots, use -force to override

system/t05_snapshot/DropSnapshot3Test_gold

@@ -0,0 +1 @@
+Snapshot `snap1` has been dropped.

system/t05_snapshot/DropSnapshot3Test_snapshot_show

@@ -0,0 +1 @@
+ERROR: unable to show: snapshot with name snap1 not found

system/t05_snapshot/DropSnapshot4Test_gold

@@ -0,0 +1,3 @@
+Snapshot `snap1` is published currently:
+ * ./maverick (main) [amd64, i386] publishes [snap1]: Snapshot from mirror [gnuplot-maverick]: http://ppa.launchpad.net/gladky-anton/gnuplot/ubuntu/ maverick
+ERROR: unable to drop: snapshot is published

system/t05_snapshot/DropSnapshot5Test_gold

@@ -0,0 +1,3 @@
+Snapshot `snap1` is published currently:
+ * ./maverick (main) [amd64, i386] publishes [snap1]: Snapshot from mirror [gnuplot-maverick]: http://ppa.launchpad.net/gladky-anton/gnuplot/ubuntu/ maverick
+ERROR: unable to drop: snapshot is published

system/t05_snapshot/DropSnapshot6Test_gold

@@ -0,0 +1 @@
+ERROR: unable to drop: snapshot with name no-such-snapshot not found

system/t05_snapshot/DropSnapshot7Test_gold

@@ -0,0 +1 @@
+Snapshot `snap1` has been dropped.

system/t05_snapshot/__init__.py

@@ -9,3 +9,4 @@ from .verify import *
 from .pull import *
 from .diff import *
 from .merge import *
+from .drop import *

system/t05_snapshot/drop.py

@@ -0,0 +1,94 @@
+from lib import BaseTest
+
+
+class DropSnapshot1Test(BaseTest):
+    """
+    drop snapshot: just drop
+    """
+    fixtureDB = True
+    fixtureCmds = ["aptly snapshot create snap1 from mirror wheezy-non-free"]
+    runCmd = "aptly snapshot drop snap1"
+
+    def check(self):
+        self.check_output()
+        self.check_cmd_output("aptly snapshot show snap1", "snapshot_show", expected_code=1)
+
+
+class DropSnapshot2Test(BaseTest):
+    """
+    drop snapshot: used as source
+    """
+    fixtureDB = True
+    fixtureCmds = [
+        "aptly snapshot create snap1 from mirror wheezy-non-free",
+        "aptly snapshot merge snap2 snap1",
+    ]
+    runCmd = "aptly snapshot drop snap1"
+    expectedCode = 1
+
+
+class DropSnapshot3Test(BaseTest):
+    """
+    drop snapshot: -force
+    """
+    fixtureDB = True
+    fixtureCmds = [
+        "aptly snapshot create snap1 from mirror wheezy-non-free",
+        "aptly snapshot merge snap2 snap1",
+    ]
+    runCmd = "aptly snapshot drop -force snap1"
+
+    def check(self):
+        self.check_output()
+        self.check_cmd_output("aptly snapshot show snap1", "snapshot_show", expected_code=1)
+
+
+class DropSnapshot4Test(BaseTest):
+    """
+    drop snapshot: already published
+    """
+    fixtureDB = True
+    fixturePool = True
+    fixtureCmds = [
+        "aptly snapshot create snap1 from mirror gnuplot-maverick",
+        "aptly publish snapshot snap1"
+    ]
+    runCmd = "aptly snapshot drop snap1"
+    expectedCode = 1
+
+
+class DropSnapshot5Test(BaseTest):
+    """
+    drop snapshot: already published with -force
+    """
+    fixtureDB = True
+    fixturePool = True
+    fixtureCmds = [
+        "aptly snapshot create snap1 from mirror gnuplot-maverick",
+        "aptly publish snapshot snap1"
+    ]
+    runCmd = "aptly snapshot drop --force snap1"
+    expectedCode = 1
+
+
+class DropSnapshot6Test(BaseTest):
+    """
+    drop snapshot: no such snapshot
+    """
+    fixtureDB = True
+    runCmd = "aptly snapshot drop no-such-snapshot"
+    expectedCode = 1
+
+
+class DropSnapshot7Test(BaseTest):
+    """
+    drop snapshot: publish, drop publish, drop snapshot
+    """
+    fixtureDB = True
+    fixturePool = True
+    fixtureCmds = [
+        "aptly snapshot create snap1 from mirror gnuplot-maverick",
+        "aptly publish snapshot snap1",
+        "aptly publish drop maverick",
+    ]
+    runCmd = "aptly snapshot drop snap1"