tests: add a testcase for applying patches

This adds a test where we clone a git and a hg repo and apply a single
patch and later a quilt series on each of them.

Signed-off-by: Henning Schild <henning.schild@siemens.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

tests/test_patch/patches/kas/quilt/001.patch

@@ -0,0 +1,24 @@
+diff --git a/CHANGELOG.md b/CHANGELOG.md
+index f1222ab..4b594e6 100644
+--- a/CHANGELOG.md
++++ b/CHANGELOG.md
+@@ -1,3 +1,6 @@
++1.0
++- isar: Take qemu-user-static from buster and adjust binfmt setup
++
+ 0.20.1
+ - kas-docker: Restore KAS_PREMIRRORS support
+ 
+diff --git a/kas/__version__.py b/kas/__version__.py
+index 020cb6f..0ac2731 100644
+--- a/kas/__version__.py
++++ b/kas/__version__.py
+@@ -25,7 +25,7 @@
+ __license__ = 'MIT'
+ __copyright__ = 'Copyright (c) Siemens AG, 2017-2018'
+ 
+-__version__ = '0.20.1'
++__version__ = '1.0'
+ 
+ # Please update docs/format-changelog.rst when changing the file version.
+ __file_version__ = 8

tests/test_patch/patches/kas/quilt/002.patch

@@ -0,0 +1,24 @@
+diff --git a/CHANGELOG.md b/CHANGELOG.md
+index 4b594e6..f1222ab 100644
+--- a/CHANGELOG.md
++++ b/CHANGELOG.md
+@@ -1,6 +1,3 @@
+-1.0
+-- isar: Take qemu-user-static from buster and adjust binfmt setup
+-
+ 0.20.1
+ - kas-docker: Restore KAS_PREMIRRORS support
+ 
+diff --git a/kas/__version__.py b/kas/__version__.py
+index 0ac2731..020cb6f 100644
+--- a/kas/__version__.py
++++ b/kas/__version__.py
+@@ -25,7 +25,7 @@
+ __license__ = 'MIT'
+ __copyright__ = 'Copyright (c) Siemens AG, 2017-2018'
+ 
+-__version__ = '1.0'
++__version__ = '0.20.1'
+ 
+ # Please update docs/format-changelog.rst when changing the file version.
+ __file_version__ = 8

tests/test_patch/patches/kas/quilt/series

@@ -0,0 +1,4 @@
+# test comment
+# this is a revert of the other 001 we applied without quilt
+001.patch # first patch
+002.patch