Verify OVC reports data too long error as necessary

- currently we have no tests that try to OVC into a too small element. This PR adds in such a test.

DAFFODIL-1595

daffodil-test/src/test/resources/org/apache/daffodil/section17/calc_value_properties/outputValueCalc.tdml

@@ -362,6 +362,16 @@
       </xs:complexType>
     </xs:element>
 
+		<xs:element name="ovc_too_large_for_element">
+			<xs:complexType>
+				<xs:sequence>
+					<xs:element name="e" type="xs:double"
+											dfdl:lengthKind="explicit" dfdl:length="{ 4 }"
+											dfdl:outputValueCalc="{ 0.555 }"/>
+				</xs:sequence>
+			</xs:complexType>
+		</xs:element>
+
 	</tdml:defineSchema>
 
 	<tdml:unparserTestCase name="binaryIntegerBigEndian"
@@ -830,4 +840,21 @@
       <tdml:document>1219</tdml:document>
     </tdml:unparserTestCase>
 
+ 	<tdml:unparserTestCase name="OVCTooLargeForElem"
+      root="ovc_too_large_for_element" model="outputValueCalc-Embedded.dfdl.xsd"
+      roundTrip="false">
+		<tdml:infoset>
+			<tdml:dfdlInfoset>
+				<ex:ovc_too_large_for_element>
+					<e/>
+				</ex:ovc_too_large_for_element>
+			</tdml:dfdlInfoset>
+		</tdml:infoset>
+		<tdml:errors>
+			<tdml:error>Unparse Error</tdml:error>
+			<tdml:error>data too long</tdml:error>
+			<tdml:error>truncate</tdml:error>
+		</tdml:errors>
+	</tdml:unparserTestCase>
+
 </tdml:testSuite>

daffodil-test/src/test/scala/org/apache/daffodil/section17/calc_value_properties/TestOutputValueCalc.scala

@@ -121,4 +121,7 @@ class TestOutputValueCalc {
 
   // DAFFODIL-2167
   @Test def test_arrayWithFollowingOVC(): Unit = { runner.runOneTest("arrayWithFollowingOVC") }
+
+  // DAFFODIL-1595
+  @Test def test_OVCTooLargeForElem(): Unit = { runner.runOneTest("OVCTooLargeForElem") }
 }