diff --git a/src/test/regress/expected/multirangetypes.out b/src/test/regress/expected/multirangetypes.out
index bde3f248a75..84c3e7c9f3b 100644
--- a/src/test/regress/expected/multirangetypes.out
+++ b/src/test/regress/expected/multirangetypes.out
@@ -2784,6 +2784,9 @@ FROM    (VALUES
  {[a,f],[g,j)}
 (1 row)
 
+--
+-- range_intersect_agg function
+--
 select range_intersect_agg(nmr) from nummultirange_test;
  range_intersect_agg 
 ---------------------
@@ -2796,13 +2799,49 @@ select range_intersect_agg(nmr) from nummultirange_test where false;
  
 (1 row)
 
+select range_intersect_agg(null::nummultirange) from nummultirange_test;
+ range_intersect_agg 
+---------------------
+ 
+(1 row)
+
+select range_intersect_agg(nmr) from (values ('{[1,3]}'::nummultirange), ('{[6,12]}'::nummultirange)) t(nmr);
+ range_intersect_agg 
+---------------------
+ {}
+(1 row)
+
+select range_intersect_agg(nmr) from (values ('{[1,6]}'::nummultirange), ('{[3,12]}'::nummultirange)) t(nmr);
+ range_intersect_agg 
+---------------------
+ {[3,6]}
+(1 row)
+
+select range_intersect_agg(nmr) from (values ('{[1,6], [10,12]}'::nummultirange), ('{[4,14]}'::nummultirange)) t(nmr);
+ range_intersect_agg 
+---------------------
+ {[4,6],[10,12]}
+(1 row)
+
 -- test with just one input:
+select range_intersect_agg(nmr) from (values ('{}'::nummultirange)) t(nmr);
+ range_intersect_agg 
+---------------------
+ {}
+(1 row)
+
 select range_intersect_agg(nmr) from (values ('{[1,2]}'::nummultirange)) t(nmr);
  range_intersect_agg 
 ---------------------
  {[1,2]}
 (1 row)
 
+select range_intersect_agg(nmr) from (values ('{[1,6], [10,12]}'::nummultirange)) t(nmr);
+ range_intersect_agg 
+---------------------
+ {[1,6],[10,12]}
+(1 row)
+
 select range_intersect_agg(nmr) from nummultirange_test where nmr @> 4.0;
  range_intersect_agg 
 ---------------------
diff --git a/src/test/regress/sql/multirangetypes.sql b/src/test/regress/sql/multirangetypes.sql
index df1edb4d31a..fbc1b9282b0 100644
--- a/src/test/regress/sql/multirangetypes.sql
+++ b/src/test/regress/sql/multirangetypes.sql
@@ -572,10 +572,19 @@ FROM    (VALUES
           ('[h,j)'::textrange)
         ) t(r);
 
+--
+-- range_intersect_agg function
+--
 select range_intersect_agg(nmr) from nummultirange_test;
 select range_intersect_agg(nmr) from nummultirange_test where false;
+select range_intersect_agg(null::nummultirange) from nummultirange_test;
+select range_intersect_agg(nmr) from (values ('{[1,3]}'::nummultirange), ('{[6,12]}'::nummultirange)) t(nmr);
+select range_intersect_agg(nmr) from (values ('{[1,6]}'::nummultirange), ('{[3,12]}'::nummultirange)) t(nmr);
+select range_intersect_agg(nmr) from (values ('{[1,6], [10,12]}'::nummultirange), ('{[4,14]}'::nummultirange)) t(nmr);
 -- test with just one input:
+select range_intersect_agg(nmr) from (values ('{}'::nummultirange)) t(nmr);
 select range_intersect_agg(nmr) from (values ('{[1,2]}'::nummultirange)) t(nmr);
+select range_intersect_agg(nmr) from (values ('{[1,6], [10,12]}'::nummultirange)) t(nmr);
 select range_intersect_agg(nmr) from nummultirange_test where nmr @> 4.0;
 
 create table nummultirange_test2(nmr nummultirange);