tests: add testcase for repo layers

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

tests/test_layers/oe-init-build-env

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+true

tests/test_layers/test.yml

@@ -0,0 +1,22 @@
+header:
+  version: 8
+
+repos:
+  this:
+
+  kas:
+    url: https://github.com/siemens/kas.git
+    refspec: master
+
+  kas1:
+    url: https://github.com/siemens/kas.git
+    refspec: master
+    layers:
+      meta-foo:
+      meta-bar:
+
+  kas2:
+    url: https://github.com/siemens/kas.git
+    refspec: master
+    layers:
+      .: excluded