diff --git a/doc/queries/doc-topologicalSort.queries b/doc/queries/doc-topologicalSort.queries
new file mode 100644
index 0000000000..80bbd23668
--- /dev/null
+++ b/doc/queries/doc-topologicalSort.queries
@@ -0,0 +1,44 @@
+BEGIN;
+BEGIN
+SET client_min_messages TO NOTICE;
+SET
+SELECT * FROM pgr_topologicalSort(
+    'SELECT id, source, target, cost, reverse_cost FROM edge_table'
+);
+ERROR:  function pgr_topologicalsort(unknown) does not exist
+LINE 1: SELECT * FROM pgr_topologicalSort(
+                      ^
+HINT:  No function matches the given name and argument types. You might need to add explicit type casts.
+-- q1
+SELECT * FROM pgr_topologicalSort(
+    'SELECT id, source, target, cost, reverse_cost
+        FROM edge_table
+     WHERE id < 17'
+);
+ERROR:  current transaction is aborted, commands ignored until end of transaction block
+-- q2
+SELECT * FROM pgr_topologicalSort(
+    'SELECT id, source, target, cost, reverse_cost
+        FROM edge_table
+     WHERE id = 18'
+);
+ERROR:  current transaction is aborted, commands ignored until end of transaction block
+-- q3
+SELECT * FROM pgr_topologicalSort(
+$$
+ SELECT id, source, target, cost, reverse_cost FROM edge_table
+    where source = any (ARRAY(SELECT node FROM pgr_connectedComponents(
+                            'SELECT id, source, target, cost, reverse_cost FROM edge_table ')
+                        WHERE component = 14)
+                       )
+                   OR
+          target = any (ARRAY(SELECT node FROM pgr_connectedComponents(
+                            'SELECT id, source, target, cost, reverse_cost FROM edge_table ')
+                        WHERE component = 14)
+                       )
+$$
+ );
+ERROR:  current transaction is aborted, commands ignored until end of transaction block
+-- q4
+ROLLBACK;
+ROLLBACK
diff --git a/test/topologicalSort/doc-topologicalSort.result b/test/topologicalSort/doc-topologicalSort.result
index e69de29bb2..a343387ddc 100644
--- a/test/topologicalSort/doc-topologicalSort.result
+++ b/test/topologicalSort/doc-topologicalSort.result
@@ -0,0 +1,44 @@
+BEGIN;
+BEGIN
+SET client_min_messages TO NOTICE;
+SET
+SELECT * FROM pgr_topologicalSort(
+    \'SELECT id, source, target, cost, reverse_cost FROM edge_table\'
+);
+ERROR:  function pgr_topologicalsort(unknown) does not exist
+LINE 1: SELECT * FROM pgr_topologicalSort(
+                      ^
+HINT:  No function matches the given name and argument types. You might need to add explicit type casts.
+-- q1
+SELECT * FROM pgr_topologicalSort(
+    \'SELECT id, source, target, cost, reverse_cost 
+        FROM edge_table 
+     WHERE id < 17\'
+);
+ERROR:  current transaction is aborted, commands ignored until end of transaction block
+-- q2
+SELECT * FROM pgr_topologicalSort(
+    \'SELECT id, source, target, cost, reverse_cost 
+        FROM edge_table 
+     WHERE id = 18\'
+);
+ERROR:  current transaction is aborted, commands ignored until end of transaction block
+-- q3
+SELECT * FROM pgr_topologicalSort(
+$$
+ SELECT id, source, target, cost, reverse_cost FROM edge_table 
+    where source = any (ARRAY(SELECT node FROM pgr_connectedComponents(
+                            \'SELECT id, source, target, cost, reverse_cost FROM edge_table \')
+                        WHERE component = 14)
+                       ) 
+                   OR     
+          target = any (ARRAY(SELECT node FROM pgr_connectedComponents(
+                            \'SELECT id, source, target, cost, reverse_cost FROM edge_table \')
+                        WHERE component = 14)
+                       )
+$$
+ );
+ERROR:  current transaction is aborted, commands ignored until end of transaction block
+-- q4
+ROLLBACK;
+ROLLBACK
\ No newline at end of file
diff --git a/test/topologicalSort/doc-topologicalSort.test.sql b/test/topologicalSort/doc-topologicalSort.test.sql
index 21db5398c4..150245355b 100644
--- a/test/topologicalSort/doc-topologicalSort.test.sql
+++ b/test/topologicalSort/doc-topologicalSort.test.sql
@@ -1,3 +1,7 @@
+SELECT * FROM pgr_topologicalSort(
+    'SELECT id, source, target, cost, reverse_cost FROM edge_table'
+);
+
 \echo -- q1
 SELECT * FROM pgr_topologicalSort(
     'SELECT id, source, target, cost, reverse_cost 
diff --git a/test/topologicalSort/test.conf b/test/topologicalSort/test.conf
index 46f7b0fb36..1843c3d68c 100644
--- a/test/topologicalSort/test.conf
+++ b/test/topologicalSort/test.conf
@@ -2,7 +2,7 @@
 
 %main::tests = (
     'any' => {
-        'comment' => 'topologicalSort algorithm tets.',
+        'comment' => 'topologicalSort algorithm tests.',
         'data' => [ ],
         'tests' => [qw(
             doc-topologicalSort