Add variants test for illegal composition

Expect LoadError with ILLEGAL_COMPOSITE when trying to override
a value in a variant with an incorrect type.

2 files changed, 24 insertions, 0 deletions

diff --git a/tests/loader/variants.py b/tests/loader/variants.py
index baa656e42..ad6d51319 100644
--- a/tests/loader/variants.py
+++ b/tests/loader/variants.py
@@ -62,6 +62,19 @@ def test_variant_only_one(datafiles):
     assert (exc.value.reason == LoadErrorReason.INVALID_DATA)
 
 
+@pytest.mark.datafiles(DATA_DIR)
+def test_variant_illegal_composite(datafiles):
+
+    basedir = os.path.join(datafiles.dirname, datafiles.basename)
+    loader = Loader(
+        basedir, 'elements/variant-illegal-composite.bst', None, None)
+
+    with pytest.raises(LoadError) as exc:
+        element = loader.load()
+
+    assert (exc.value.reason == LoadErrorReason.ILLEGAL_COMPOSITE)
+
+
 ##############################################################
 #                Test Simple Variant Compositing             #
 ##############################################################
diff --git a/tests/loader/variants/elements/variant-illegal-composite.bst b/tests/loader/variants/elements/variant-illegal-composite.bst
new file mode 100644
index 000000000..d28382f1a
--- /dev/null
+++ b/tests/loader/variants/elements/variant-illegal-composite.bst
@@ -0,0 +1,11 @@
+kind: pony
+description: This variant overrides a config value with an incorrect type
+config:
+  number: 5
+variants:
+- variant: first
+  config:
+    number: four
+- variant: second
+  config:
+    number: six