diff --git a/test/model/default/classes/first.yml b/test/model/default/classes/first.yml
new file mode 100644
index 0000000..9b72a26
--- /dev/null
+++ b/test/model/default/classes/first.yml
@@ -0,0 +1,32 @@
+parameters:
+  _param:
+    some: param
+    colour: red
+  lab:
+    name: test
+    label: first
+  colour:
+    escaped: \${_param:colour}
+    doubleescaped: \\${_param:colour}
+    unescaped: ${_param:colour}
+  colours:
+    red:
+      name: red
+    blue:
+      name: blue
+  one:
+    a: 1
+    b: 2
+  two:
+    c: 3
+    d: 4
+  three:
+    e: 5
+  list_to_override:
+  - one
+  - two
+  dict_to_override:
+   one: 1
+   two: 2
+
+
diff --git a/test/model/default/classes/lab/env/dev.yml b/test/model/default/classes/lab/env/dev.yml
new file mode 100644
index 0000000..0cce363
--- /dev/null
+++ b/test/model/default/classes/lab/env/dev.yml
@@ -0,0 +1,4 @@
+
+parameters:
+  lab:
+    name: dev
diff --git a/test/model/default/classes/second.yml b/test/model/default/classes/second.yml
new file mode 100644
index 0000000..dab50c7
--- /dev/null
+++ b/test/model/default/classes/second.yml
@@ -0,0 +1,9 @@
+classes:
+- first
+
+parameters:
+  will:
+    warn:
+      at:
+        second: ${_param:notfound}
+  three: ${one}
diff --git a/test/model/default/classes/third.yml b/test/model/default/classes/third.yml
new file mode 100644
index 0000000..135acd4
--- /dev/null
+++ b/test/model/default/classes/third.yml
@@ -0,0 +1,18 @@
+classes:
+- second
+
+parameters:
+  _param:
+    notfound: exist
+  myparam: ${_param:some}
+  will:
+    not:
+      fail:
+        at:
+          tree: ${_param:notfound}
+  three: ${two}
+  empty:
+    list: []
+    dict: {}
+  ~list_to_override: ${empty:list}
+  ~dict_to_override: ${empty:dict}
diff --git a/test/model/default/nodes/reclass.yml b/test/model/default/nodes/reclass.yml
new file mode 100644
index 0000000..94b7519
--- /dev/null
+++ b/test/model/default/nodes/reclass.yml
@@ -0,0 +1,3 @@
+
+classes:
+- third
diff --git a/test/model/default/reclass-config.yml b/test/model/default/reclass-config.yml
new file mode 100644
index 0000000..9d8f30f
--- /dev/null
+++ b/test/model/default/reclass-config.yml
@@ -0,0 +1 @@
+storage_type: yaml_fs
diff --git a/test/model/extensions/classes/first.yml b/test/model/extensions/classes/first.yml
new file mode 100644
index 0000000..96ece27
--- /dev/null
+++ b/test/model/extensions/classes/first.yml
@@ -0,0 +1,6 @@
+parameters:
+  _param:
+    some: param
+  lab:
+    name: test
+    label: first
diff --git a/test/model/extensions/classes/lab/env/dev.yml b/test/model/extensions/classes/lab/env/dev.yml
new file mode 100644
index 0000000..0cce363
--- /dev/null
+++ b/test/model/extensions/classes/lab/env/dev.yml
@@ -0,0 +1,4 @@
+
+parameters:
+  lab:
+    name: dev
diff --git a/test/model/extensions/classes/second.yml b/test/model/extensions/classes/second.yml
new file mode 100644
index 0000000..a9babd3
--- /dev/null
+++ b/test/model/extensions/classes/second.yml
@@ -0,0 +1,8 @@
+classes:
+- first
+
+parameters:
+  will:
+    warn:
+      at:
+        second: ${_param:notfound}
diff --git a/test/model/extensions/classes/third.yml b/test/model/extensions/classes/third.yml
new file mode 100644
index 0000000..20a937c
--- /dev/null
+++ b/test/model/extensions/classes/third.yml
@@ -0,0 +1,13 @@
+classes:
+- missing.class
+- second
+
+parameters:
+  _param:
+    notfound: exist
+  myparam: ${_param:some}
+  will:
+    not:
+      fail:
+        at:
+          tree: ${_param:notfound}
diff --git a/test/model/extensions/nodes/reclass.yml b/test/model/extensions/nodes/reclass.yml
new file mode 100644
index 0000000..94b7519
--- /dev/null
+++ b/test/model/extensions/nodes/reclass.yml
@@ -0,0 +1,3 @@
+
+classes:
+- third
diff --git a/test/model/extensions/reclass-config.yml b/test/model/extensions/reclass-config.yml
new file mode 100644
index 0000000..6e2f101
--- /dev/null
+++ b/test/model/extensions/reclass-config.yml
@@ -0,0 +1,3 @@
+storage_type: yaml_fs
+ignore_class_notfound: True
+ignore_class_regexp: ['.*']