[processing][SAGA] Fix interpolation choices for add grid values algorithms

And add more tests

Fixes #19132

python/plugins/processing/algs/saga/description/AddGridValuestoPoints.txt

@@ -2,6 +2,6 @@ Add Grid Values to Points
 shapes_grid
 QgsProcessingParameterFeatureSource|SHAPES|Points|0|None|False
 QgsProcessingParameterMultipleLayers|GRIDS|Grids|3|None|False
-QgsProcessingParameterEnum|RESAMPLING|Interpolation|[0] Nearest Neighbor;[1] Bilinear Interpolation;[2] Inverse Distance Interpolation;[3] Bicubic Spline Interpolation;[4] B-Spline Interpolation
+QgsProcessingParameterEnum|RESAMPLING|Interpolation|[0] Nearest Neighbor;[1] Bilinear Interpolation;[2] Bicubic Spline Interpolation;[3] B-Spline Interpolation
 QgsProcessingParameterVectorDestination|RESULT|Result
 AllowUnmatching

python/plugins/processing/algs/saga/description/AddGridValuestoShapes.txt

@@ -2,6 +2,6 @@ Add Grid Values to Shapes
 shapes_grid
 QgsProcessingParameterFeatureSource|SHAPES|Shapes|-1|None|False
 QgsProcessingParameterMultipleLayers|GRIDS|Grids|3|None|False
-QgsProcessingParameterEnum|RESAMPLING|Interpolation|[0] Nearest Neighbor;[1] Bilinear Interpolation;[2] Inverse Distance Interpolation;[3] Bicubic Spline Interpolation;[4] B-Spline Interpolation
+QgsProcessingParameterEnum|RESAMPLING|Interpolation|[0] Nearest Neighbor;[1] Bilinear Interpolation;[2] Bicubic Spline Interpolation;[3] B-Spline Interpolation
 QgsProcessingParameterVectorDestination|RESULT|Result
 AllowUnmatching

python/plugins/processing/tests/testdata/custom/lines_over.cpg

@@ -0,0 +1 @@
+UTF-8

python/plugins/processing/tests/testdata/custom/lines_over.prj

@@ -0,0 +1 @@
+GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]

python/plugins/processing/tests/testdata/custom/lines_over.qpj

@@ -0,0 +1 @@
+GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]]

python/plugins/processing/tests/testdata/expected/saga/add_grid_to_shapes.mshp

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<SAGA_METADATA>
+  <HISTORY saga-version="2.3.1">
+    <MODULE library="shapes_grid" id="1" name="Add Grid Values to Shapes">
+      <OPTION type="choice" id="RESAMPLING" name="Resampling" index="0">Nearest Neighbour</OPTION>
+      <INPUT type="shapes" id="SHAPES" name="Shapes">
+        <FILE>/home/nyall/dev/QGIS/python/plugins/processing/tests/testdata/custom/lines_over.shp</FILE>
+      </INPUT>
+      <INPUT_LIST type="grid_list" id="GRIDS" name="Grids">
+        <dem type="grid_list" id="GRIDS" name="Grids">
+          <FILE>/tmp/processing_f0fd76cf1e1e4c69bab137429bd6084c/a59bb63955554f778856866bbe0bca17/dem.sgrd</FILE>
+        </dem>
+      </INPUT_LIST>
+      <OUTPUT type="shapes" id="RESULT" name="Result">lines_over</OUTPUT>
+    </MODULE>
+  </HISTORY>
+  <SOURCE>
+    <FILE></FILE>
+    <DATABASE>
+      <FIELDS>
+        <FIELD TYPE="LONGINT">id</FIELD>
+        <FIELD TYPE="STRING">name</FIELD>
+        <FIELD TYPE="DOUBLE">dem</FIELD>
+      </FIELDS>
+    </DATABASE>
+    <PROJECTION></PROJECTION>
+  </SOURCE>
+  <DESCRIPTION></DESCRIPTION>
+</SAGA_METADATA>

python/plugins/processing/tests/testdata/expected/saga/add_grid_to_shapes.prj

@@ -0,0 +1 @@
+GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]]

python/plugins/processing/tests/testdata/saga_algorithm_tests.yaml

@@ -46,6 +46,23 @@ tests:
         name: expected/saga/add_grid_to_points.shp
         type: vector
 
+  - algorithm: saga:addrastervaluestofeatures
+    name: Add raster values to shapes
+    params:
+      GRIDS:
+        params:
+        - name: dem.tif
+          type: raster
+        type: multi
+      RESAMPLING: 0
+      SHAPES:
+        name: custom/lines_over.shp
+        type: vector
+    results:
+      RESULT:
+        name: expected/saga/add_grid_to_shapes.shp
+        type: vector
+
   - algorithm: saga:mergevectorlayers
     name: Merge vector layers
     params: