repos: add tests for common errors

This patch adds tests for common errors when working with patches.

Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

tests/test_patch/test-invalid.yml

@@ -0,0 +1,13 @@
+header:
+  version: 8
+
+repos:
+  this:
+
+  kas:
+    url: https://github.com/siemens/kas.git
+    refspec: 907816a5c4094b59a36aec12226e71c461c05b77
+    patches:
+      plain:
+        repo: this
+        path: patches/kas/001-non-existent.patch

tests/test_patch/test-invalid2.yml

@@ -0,0 +1,11 @@
+header:
+  version: 8
+
+repos:
+  kas:
+    url: https://github.com/siemens/kas.git
+    refspec: 907816a5c4094b59a36aec12226e71c461c05b77
+    patches:
+      plain:
+        repo: non-existent
+        path: patches/kas/001.patch

tests/test_patch/test-invalid3.yml

@@ -0,0 +1,13 @@
+header:
+  version: 8
+
+repos:
+  this:
+
+  kas:
+    url: https://github.com/ilbers/isar.git
+    refspec: 47aaeedecd0ea6f754da36be1d10717b04eb8275
+    patches:
+      plain:
+        repo: this
+        path: patches/kas/001.patch