diff --git a/python/plugins/processing/tests/testdata/expected/autoincrement_field.gml b/python/plugins/processing/tests/testdata/expected/autoincrement_field.gml
new file mode 100644
index 00000000000..7ea5c9e9a00
--- /dev/null
+++ b/python/plugins/processing/tests/testdata/expected/autoincrement_field.gml
@@ -0,0 +1,68 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ogr:FeatureCollection
+     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+     xsi:schemaLocation="http://ogr.maptools.org/ autoincrement_field.xsd"
+     xmlns:ogr="http://ogr.maptools.org/"
+     xmlns:gml="http://www.opengis.net/gml">
+  <gml:boundedBy>
+    <gml:Box>
+      <gml:coord><gml:X>0</gml:X><gml:Y>-5</gml:Y></gml:coord>
+      <gml:coord><gml:X>8</gml:X><gml:Y>3</gml:Y></gml:coord>
+    </gml:Box>
+  </gml:boundedBy>
+                                                                                                                                                               
+  <gml:featureMember>
+    <ogr:autoincrement_field fid="points.0">
+      <ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>1,1</gml:coordinates></gml:Point></ogr:geometryProperty>
+      <ogr:AUTO>0</ogr:AUTO>
+    </ogr:autoincrement_field>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:autoincrement_field fid="points.1">
+      <ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>3,3</gml:coordinates></gml:Point></ogr:geometryProperty>
+      <ogr:AUTO>1</ogr:AUTO>
+    </ogr:autoincrement_field>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:autoincrement_field fid="points.2">
+      <ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>2,2</gml:coordinates></gml:Point></ogr:geometryProperty>
+      <ogr:AUTO>2</ogr:AUTO>
+    </ogr:autoincrement_field>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:autoincrement_field fid="points.3">
+      <ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>5,2</gml:coordinates></gml:Point></ogr:geometryProperty>
+      <ogr:AUTO>3</ogr:AUTO>
+    </ogr:autoincrement_field>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:autoincrement_field fid="points.4">
+      <ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>4,1</gml:coordinates></gml:Point></ogr:geometryProperty>
+      <ogr:AUTO>4</ogr:AUTO>
+    </ogr:autoincrement_field>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:autoincrement_field fid="points.5">
+      <ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>0,-5</gml:coordinates></gml:Point></ogr:geometryProperty>
+      <ogr:AUTO>5</ogr:AUTO>
+    </ogr:autoincrement_field>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:autoincrement_field fid="points.6">
+      <ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>8,-1</gml:coordinates></gml:Point></ogr:geometryProperty>
+      <ogr:AUTO>6</ogr:AUTO>
+    </ogr:autoincrement_field>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:autoincrement_field fid="points.7">
+      <ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>7,-1</gml:coordinates></gml:Point></ogr:geometryProperty>
+      <ogr:AUTO>7</ogr:AUTO>
+    </ogr:autoincrement_field>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:autoincrement_field fid="points.8">
+      <ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>0,-1</gml:coordinates></gml:Point></ogr:geometryProperty>
+      <ogr:AUTO>8</ogr:AUTO>
+    </ogr:autoincrement_field>
+  </gml:featureMember>
+</ogr:FeatureCollection>
diff --git a/python/plugins/processing/tests/testdata/expected/autoincrement_field.xsd b/python/plugins/processing/tests/testdata/expected/autoincrement_field.xsd
new file mode 100644
index 00000000000..d6770f6e562
--- /dev/null
+++ b/python/plugins/processing/tests/testdata/expected/autoincrement_field.xsd
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xs:schema targetNamespace="http://ogr.maptools.org/" xmlns:ogr="http://ogr.maptools.org/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:gml="http://www.opengis.net/gml" elementFormDefault="qualified" version="1.0">
+<xs:import namespace="http://www.opengis.net/gml" schemaLocation="http://schemas.opengis.net/gml/2.1.2/feature.xsd"/>
+<xs:element name="FeatureCollection" type="ogr:FeatureCollectionType" substitutionGroup="gml:_FeatureCollection"/>
+<xs:complexType name="FeatureCollectionType">
+  <xs:complexContent>
+    <xs:extension base="gml:AbstractFeatureCollectionType">
+      <xs:attribute name="lockId" type="xs:string" use="optional"/>
+      <xs:attribute name="scope" type="xs:string" use="optional"/>
+    </xs:extension>
+  </xs:complexContent>
+</xs:complexType>
+<xs:element name="autoincrement_field" type="ogr:autoincrement_field_Type" substitutionGroup="gml:_Feature"/>
+<xs:complexType name="autoincrement_field_Type">
+  <xs:complexContent>
+    <xs:extension base="gml:AbstractFeatureType">
+      <xs:sequence>
+        <xs:element name="geometryProperty" type="gml:PointPropertyType" nillable="true" minOccurs="0" maxOccurs="1"/>
+        <xs:element name="AUTO" nillable="true" minOccurs="0" maxOccurs="1">
+          <xs:simpleType>
+            <xs:restriction base="xs:integer">
+              <xs:totalDigits value="10"/>
+            </xs:restriction>
+          </xs:simpleType>
+        </xs:element>
+      </xs:sequence>
+    </xs:extension>
+  </xs:complexContent>
+</xs:complexType>
+</xs:schema>
diff --git a/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml b/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml
index 9258a72d955..3d1e3403d4a 100644
--- a/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml
+++ b/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml
@@ -122,3 +122,14 @@ tests:
         compare:
           geometry:
             precision: 7
+  - algorithm: qgis:addautoincrementalfield
+    name: Add autoincremental field
+    params:
+      INPUT:
+        name: points.gml
+        type: vector
+    results:
+      OUTPUT:
+        name: expected/autoincrement_field.gml
+        type: vector
+