diff --git a/test/alignment_tests.py b/test/alignment_tests.py
new file mode 100644
index 0000000..803acda
--- /dev/null
+++ b/test/alignment_tests.py
@@ -0,0 +1,51 @@
+import os
+import sys
+import glob
+import pytest
+import ifcopenshell
+import ifcopenshell.express
+
+schema_iden = sys.argv[-1]
+
+schema = ifcopenshell.express.parse(f"{schema_iden}.exp")
+ifcopenshell.register_schema(schema)
+
+filenames = glob.glob(
+    os.path.join(os.path.dirname(__file__), "../models/**/*.ifc"), recursive=True
+)
+files = list(map(ifcopenshell.open, filenames))
+alignments = [f.by_type("IfcAlignment") for f in files]
+pairs = [
+    (os.path.basename(fn), al) for fn, als in zip(filenames, alignments) for al in als
+]
+
+
+@pytest.mark.parametrize("filename_alignment", pairs)
+def test_alignment_final_segment_length(filename_alignment):
+    filename, alignment = filename_alignment
+    horizontal = alignment.IsNestedBy[0].RelatedObjects[0]
+    last_segment = horizontal.IsNestedBy[0].RelatedObjects[-1]
+    segment_length = last_segment.DesignParameters.SegmentLength
+    assert (
+        segment_length == 0.0
+    ), f"In {filename}, {alignment} has final segment length {segment_length}"
+
+
+@pytest.mark.parametrize("filename_alignment", pairs)
+def test_alignment_project_aggregation(filename_alignment):
+    filename, alignment = filename_alignment
+    while True:
+        try:
+            previous, alignment = alignment, alignment.Decomposes[0].RelatingObject
+        except IndexError:
+            alignment = None
+        if alignment and alignment.is_a("IfcProject"):
+            break
+        elif alignment and alignment.is_a("IfcAlignment"):
+            continue
+        else:
+            assert False, f"In {filename}, {previous} decomposes {alignment}"
+
+
+if __name__ == "__main__":
+    pytest.main(["-sx", __file__])
diff --git a/validate.sh b/validate.sh
index d50377d..ca6c7fe 100755
--- a/validate.sh
+++ b/validate.sh
@@ -1,3 +1,5 @@
+set -e
+
 # obtain most recent express schema
 git clone --depth 1 https://github.com/buildingSMART/IFC4.3.x-output /tmp/IFC4.3.x-output
 
@@ -22,3 +24,5 @@ find models -name '*.ifc' -exec perl -pi -e "s/(?<=FILE_SCHEMA \(\(')IFC\w+/$sch
 
 # validate models
 find models -name '*.ifc' -print0 | xargs -0 -n1 python ifc-pipeline-validation/application/validate.py
+
+python test/alignment_tests.py $schema_identifier