more coverage

Signed-off-by: Marc Handalian <[email protected]>

server/src/test/java/org/opensearch/index/mapper/DerivedFieldTypeTests.java

@@ -17,10 +17,14 @@
 import org.apache.lucene.document.LongPoint;
 import org.apache.lucene.index.LeafReaderContext;
 import org.apache.lucene.index.memory.MemoryIndex;
+import org.apache.lucene.queries.spans.SpanMultiTermQueryWrapper;
+import org.apache.lucene.search.Query;
 import org.apache.lucene.util.BytesRef;
 import org.opensearch.OpenSearchException;
 import org.opensearch.common.collect.Tuple;
+import org.opensearch.common.geo.GeoPoint;
 import org.opensearch.common.network.InetAddresses;
+import org.opensearch.index.query.DerivedFieldQuery;
 import org.opensearch.index.query.QueryShardContext;
 import org.opensearch.script.AggregationScript;
 import org.opensearch.script.Script;
@@ -59,6 +63,7 @@ public void testBooleanType() {
         assertTrue(dft.getFieldMapper() instanceof BooleanFieldMapper);
         assertTrue(dft.getIndexableFieldGenerator().apply(true) instanceof Field);
         assertTrue(dft.getIndexableFieldGenerator().apply(false) instanceof Field);
+        assertEquals("derived", dft.typeName());
     }
 
     public void testDateType() {
@@ -159,6 +164,16 @@ public void testGetAggregationScript_ip() throws IOException {
         assertEquals(new BytesRef(InetAddressPoint.encode(InetAddresses.forString((String) expected.get(0)))), result.get(0));
     }
 
+    public void testDerivedFieldValueFetcherDoesNotSupportCustomFormats() {
+        DerivedFieldType dft = createDerivedFieldType("boolean");
+        expectThrows(IllegalArgumentException.class, () -> dft.valueFetcher(mock(QueryShardContext.class), mock(SearchLookup.class), "yyyy-MM-dd"));
+    }
+
+    public void testSpanPrefixQueryNotSupported() {
+        DerivedFieldType dft = createDerivedFieldType("boolean");
+        expectThrows(IllegalArgumentException.class, () -> dft.spanPrefixQuery("value", mock(SpanMultiTermQueryWrapper.SpanRewriteMethod.class), mock(QueryShardContext.class)));
+    }
+
     private static LeafSearchLookup mockValueFetcherForAggs(QueryShardContext mockContext, DerivedFieldType dft, List<Object> expected) {
         SearchLookup searchLookup = mock(SearchLookup.class);
         LeafSearchLookup leafLookup = mock(LeafSearchLookup.class);