1 files changed, 29 insertions, 0 deletions
diff --git a/basic/qa/basic_coverage/test_ismissing_cascade.bas b/basic/qa/basic_coverage/test_ismissing_cascade.bas
new file mode 100644
index 000000000..f2f3a8b20
--- /dev/null
+++ b/basic/qa/basic_coverage/test_ismissing_cascade.bas
@@ -0,0 +1,29 @@
+Option Explicit
+
+Function doUnitTest() As String
+    TestUtil.TestInit
+    verify_testIsMissingCascade
+    doUnitTest = TestUtil.GetResult()
+End Function
+
+Sub verify_testIsMissingCascade()
+
+    On Error GoTo errorHandler
+
+    ' tdf#136143 - test cascading optionals in order to prevent type conversion errors, because
+    ' optional arguments are of type SbxERROR and set to not fixed.
+    TestUtil.AssertEqual(TestOpt(), 2, "Cascading optionals")
+
+    Exit Sub
+errorHandler:
+    TestUtil.ReportErrorHandler("verify_testIsMissingCascade", Err, Error$, Erl)
+End Sub
+
+Function TestOpt(Optional A)
+    TestOpt = TestOptCascade(A)
+End Function
+
+Function TestOptCascade(Optional A)
+    If IsMissing(A) Then A = 2
+    TestOptCascade = A
+End Function