diff --git a/.gitignore b/.gitignore
index b6e4761..db6c8d9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
+.DS_Store
+.idea/
+
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]
diff --git a/decimal_test.py b/decimal_test.py
new file mode 100644
index 0000000..f4af9d2
--- /dev/null
+++ b/decimal_test.py
@@ -0,0 +1,27 @@
+import crdch_model as cm
+from linkml_runtime.dumpers import yaml_dumper
+
+
+def test_dumps_vcc():
+    vcc_obs = cm.Observation(observation_type=cm.CodeableConcept(),
+                             value_codeable_concept=cm.CodeableConcept(
+                                 coding=cm.Coding(code="3.1415", system="math professor")))
+    vcc_dump = yaml_dumper.dumps(vcc_obs)
+    # print statements ignored by default in passing pytests?
+    # https://stackoverflow.com/questions/24617397/how-to-print-to-console-in-pytest
+    # https://intellij-support.jetbrains.com/hc/en-us/community/posts/360007644040-Show-logging-output-when-using-pytest
+    # added `-p no:logging -s` to "Additional Arguments" in Run Configuration
+    # also try (global?) Run Configuration Template for pytest
+    print(vcc_dump)
+    assert len(vcc_dump) > 0
+
+
+def test_dumps_decimal():
+    decimal_obs = cm.Observation(observation_type=cm.CodeableConcept(), value_decimal="1.23")
+    vd_dump = ""
+    try:
+        vd_dump = yaml_dumper.dumps(decimal_obs)
+    except Exception as e:
+        # PEP 8: E722 do not use bare 'except'
+        print(f"{e}\nCouldn't dump CRDC-H decimal value to YAML string")
+    assert len(vd_dump) > 0