diff --git a/python/plugins/processing/tests/testdata/expected/valid.gfs b/python/plugins/processing/tests/testdata/expected/valid.gfs
new file mode 100644
index 00000000000..2f534672d46
--- /dev/null
+++ b/python/plugins/processing/tests/testdata/expected/valid.gfs
@@ -0,0 +1,16 @@
+<GMLFeatureClassList>
+  <GMLFeatureClass>
+    <Name>valid</Name>
+    <ElementPath>valid</ElementPath>
+    <!--MULTIPOLYGON-->
+    <GeometryType>6</GeometryType>
+    <SRSName>EPSG:4326</SRSName>
+    <DatasetSpecificInfo>
+      <FeatureCount>1</FeatureCount>
+      <ExtentXMin>122.17632</ExtentXMin>
+      <ExtentXMax>122.19038</ExtentXMax>
+      <ExtentYMin>-8.60636</ExtentYMin>
+      <ExtentYMax>-8.59579</ExtentYMax>
+    </DatasetSpecificInfo>
+  </GMLFeatureClass>
+</GMLFeatureClassList>
diff --git a/python/plugins/processing/tests/testdata/expected/valid.gml b/python/plugins/processing/tests/testdata/expected/valid.gml
new file mode 100644
index 00000000000..ac8d2cad044
--- /dev/null
+++ b/python/plugins/processing/tests/testdata/expected/valid.gml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ogr:FeatureCollection
+     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+     xsi:schemaLocation=""
+     xmlns:ogr="http://ogr.maptools.org/"
+     xmlns:gml="http://www.opengis.net/gml">
+  <gml:boundedBy>
+    <gml:Box>
+      <gml:coord><gml:X>122.1763203897661</gml:X><gml:Y>-8.606355050987483</gml:Y></gml:coord>
+      <gml:coord><gml:X>122.1903768142314</gml:X><gml:Y>-8.595792419886385</gml:Y></gml:coord>
+    </gml:Box>
+  </gml:boundedBy>
+                                                                                              
+  <gml:featureMember>
+    <ogr:valid fid="invalidgeometries.0">
+      <ogr:geometryProperty><gml:MultiPolygon srsName="EPSG:4326"><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>122.186446688291,-8.60019485107161 122.188508041037,-8.60212999854704 122.186395514816,-8.60635505098748 122.183795482545,-8.60261750459786 122.186446688291,-8.60019485107161</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>122.176320389766,-8.60123623745388 122.179976685147,-8.59774244408966 122.183895970553,-8.59830234200473 122.176320389766,-8.60123623745388</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>122.186446688291,-8.60019485107161 122.184526741622,-8.59839245215742 122.183895970553,-8.59830234200473 122.190376814231,-8.59579241988638 122.188508041037,-8.59831120114895 122.186446688291,-8.60019485107161</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember></gml:MultiPolygon></ogr:geometryProperty>
+    </ogr:valid>
+  </gml:featureMember>
+</ogr:FeatureCollection>
diff --git a/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml b/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml
index a97c5443a49..9c2d957da6b 100644
--- a/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml
+++ b/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml
@@ -2300,6 +2300,17 @@ tests:
         name: expected/zonal_statistics.gml
         type: vector
 
+  - algorithm: qgis:fixgeometries
+    name: Fix geometries
+    params:
+      INPUT:
+        name: invalidgeometries.gml
+        type: vector
+    results:
+      OUTPUT:
+        name: expected/valid.gml
+        type: vector
+
   - algorithm: qgis:polygonize
     name: Polygonize
     params: