diff --git a/nixos/tests/postgresql/anonymizer.nix b/nixos/tests/postgresql/anonymizer.nix
index e7f4981184d0..30775761f563 100644
--- a/nixos/tests/postgresql/anonymizer.nix
+++ b/nixos/tests/postgresql/anonymizer.nix
@@ -50,9 +50,9 @@ let
             ]
 
         def check_anonymized_row(row, id, original_name):
-            assert row[0] == id, f"Expected first row to have ID {id}, but got {row[0]}"
-            assert row[1] != original_name, f"Expected first row to have a name other than {original_name}"
-            assert not bool(row[2]), "Expected points to be NULL in first row"
+            t.assertEqual(row[0], id)
+            t.assertNotEqual(row[1], original_name)
+            t.assertFalse(bool(row[2]))
 
         def find_xsv_in_dump(dump, sep=','):
             """
@@ -81,8 +81,8 @@ let
                 raise
 
         def check_original_data(output):
-            assert output[0] == ['1','Foo','23'], f"Expected first row from player table to be 1,Foo,23; got {output[0]}"
-            assert output[1] == ['2','Bar','42'], f"Expected first row from player table to be 2,Bar,42; got {output[1]}"
+            t.assertEqual(output[0], ["1", "Foo", "23"])
+            t.assertEqual(output[1], ["2", "Bar", "42"])
 
         def check_anonymized_rows(output):
             check_anonymized_row(output[0], '1', 'Foo')
diff --git a/nixos/tests/postgresql/postgresql-jit.nix b/nixos/tests/postgresql/postgresql-jit.nix
index fd9567182a20..347534c8bd85 100644
--- a/nixos/tests/postgresql/postgresql-jit.nix
+++ b/nixos/tests/postgresql/postgresql-jit.nix
@@ -42,8 +42,8 @@ let
                   SELECT CONCAT('jit result = ', SUM(id)) from demo;
                 ''} | sudo -u postgres psql"
             )
-            assert "JIT:" in output
-            assert "jit result = 15" in output
+            t.assertIn("JIT:", output)
+            t.assertIn("jit result = 15", output)
 
         machine.shutdown()
       '';
diff --git a/nixos/tests/postgresql/postgresql.nix b/nixos/tests/postgresql/postgresql.nix
index 77897143bbdd..2c80e8fe67e5 100644
--- a/nixos/tests/postgresql/postgresql.nix
+++ b/nixos/tests/postgresql/postgresql.nix
@@ -236,13 +236,13 @@ let
                 )
               )
               print(clauses)
-              assert clauses['rolsuper'], 'expected user with clauses to have superuser clause'
-              assert clauses['rolinherit'], 'expected user with clauses to have inherit clause'
-              assert clauses['rolcreaterole'], 'expected user with clauses to have create role clause'
-              assert clauses['rolcreatedb'], 'expected user with clauses to have create db clause'
-              assert clauses['rolcanlogin'], 'expected user with clauses to have login clause'
-              assert clauses['rolreplication'], 'expected user with clauses to have replication clause'
-              assert clauses['rolbypassrls'], 'expected user with clauses to have bypassrls clause'
+              t.assertTrue(clauses["rolsuper"])
+              t.assertTrue(clauses["rolinherit"])
+              t.assertTrue(clauses["rolcreaterole"])
+              t.assertTrue(clauses["rolcreatedb"])
+              t.assertTrue(clauses["rolcanlogin"])
+              t.assertTrue(clauses["rolreplication"])
+              t.assertTrue(clauses["rolbypassrls"])
 
           with subtest("All user permissions default when ensureClauses is not provided"):
               clauses = json.loads(
@@ -250,13 +250,13 @@ let
                     "sudo -u postgres psql -tc \"${getClausesQuery "default-clauses"}\""
                 )
               )
-              assert not clauses['rolsuper'], 'expected user with no clauses set to have default superuser clause'
-              assert clauses['rolinherit'], 'expected user with no clauses set to have default inherit clause'
-              assert not clauses['rolcreaterole'], 'expected user with no clauses set to have default create role clause'
-              assert not clauses['rolcreatedb'], 'expected user with no clauses set to have default create db clause'
-              assert clauses['rolcanlogin'], 'expected user with no clauses set to have default login clause'
-              assert not clauses['rolreplication'], 'expected user with no clauses set to have default replication clause'
-              assert not clauses['rolbypassrls'], 'expected user with no clauses set to have default bypassrls clause'
+              t.assertFalse(clauses["rolsuper"])
+              t.assertTrue(clauses["rolinherit"])
+              t.assertFalse(clauses["rolcreaterole"])
+              t.assertFalse(clauses["rolcreatedb"])
+              t.assertTrue(clauses["rolcanlogin"])
+              t.assertFalse(clauses["rolreplication"])
+              t.assertFalse(clauses["rolbypassrls"])
 
           machine.shutdown()
         '';