diff --git a/tests/test_issues_server.py b/tests/test_issues_server.py
index 98bcb473822d037820b65e1393db52ba72009dea..81fe351f21c172f4650befe516d3833d103e5d3c 100644
--- a/tests/test_issues_server.py
+++ b/tests/test_issues_server.py
@@ -1254,3 +1254,53 @@ def test_196b(deny):
         # this should fail because the curator doesn't have TRANSACTION:INSERT:PROPERTY
         db.Property(name="TestProp2", datatype=db.TEXT).insert()
     assert cm.value.errors[0].msg == "You are not allowed to do this."
+
+
+@pytest.mark.xfail(reason="fix needed")
+@pytest.mark.parametrize("num", ["1e+23", "5e22", "2e-323"])
+def test_143(num):
+    """https://gitlab.com/caosdb/caosdb-server/-/issues/144"""
+    db.Property(name="scientific_notation", datatype=db.DOUBLE).insert()
+    db.RecordType(name="RT1").add_property("scientific_notation", value=num).insert()
+
+    db.execute_query(f"FIND RECORDTYPE RT1 WITH scientific_notation={num}", unique=True)
+    db.execute_query(f"FIND RECORDTYPE RT1 WITH scientific_notation='{num}'", unique=True)
+    db.execute_query(f"FIND RECORDTYPE RT1 WITH scientific_notation=\"{num}\"", unique=True)
+    db.execute_query(f"FIND RECORDTYPE RT1 WITH scientific_notation = {num}", unique=True)
+    db.execute_query(f"FIND RECORDTYPE RT1 WITH scientific_notation = '{num}'", unique=True)
+    db.execute_query(f"FIND RECORDTYPE RT1 WITH scientific_notation = \"{num}\"", unique=True)
+
+
+def test_144():
+    """https://gitlab.com/caosdb/caosdb-server/-/issues/144"""
+    db.Property(name="scientific_notation", datatype=db.DOUBLE, value="1e23").insert()
+
+    value = db.execute_query("FIND PROPERTY scientific_notation", unique=True).value
+    assert str(value) == "1e+23"
+    assert isinstance(value, float)
+    assert value == 1e23
+    assert value == 1e+23
+
+
+def test_166():
+    """https://gitlab.com/caosdb/caosdb-server/-/issues/166"""
+    db.RecordType(name="exists").insert()
+    db.Property(name="exists_property", datatype=db.INTEGER).insert()
+
+    db.RecordType(name="RT1").add_parent("exists").insert()
+    db.RecordType(name="RT2").add_parent("exists").add_property("exists_property", 32453).insert()
+
+    with pytest.raises(TransactionError) as cm:
+        db.Record(name="RT3").add_parent("notexists").insert()
+    assert [e.msg for e in cm.value.errors] == ["Entity has unqualified parents."]
+
+    with pytest.raises(TransactionError) as cm:
+        db.Record(name="RT4").add_parent("exists").add_property("notexists", 234243).insert()
+    assert [e.msg for e in cm.value.errors] == ["Entity has unqualified properties."]
+
+    with pytest.raises(TransactionError) as cm:
+        db.Record(
+            name="RT5").add_parent("notexists").add_property(
+            "exists_property",
+            234243).insert()
+    assert [e.msg for e in cm.value.errors] == ["Entity has unqualified parents."]
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