Add GeoPoint Gaussian testcases

Author: timgrein

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/function/fulltext/DecayTests.java

@@ -115,6 +115,13 @@ public static Iterable<Object[]> parameters() {
         testCaseSuppliers.addAll(geoPointTestCase("POINT (180.0 90.0)", "POINT (1 1)", "10000km", "10km", 0.33, "exp", 0.3341838411351592));
         testCaseSuppliers.addAll(geoPointTestCase("POINT (-180.0 -90.0)", "POINT (1 1)", "10000km", "10km", 0.33, "exp", 0.32604509444656576));
 
+        // GeoPoint Gaussian
+        testCaseSuppliers.addAll(geoPointTestCase("POINT (1.0 1.0)", "POINT (1 1)", "10000km", "10km", 0.33, "gauss", 1.0));
+        testCaseSuppliers.addAll(geoPointTestCase("POINT (0 0)", "POINT (1 1)", "10000km", "10km", 0.33, "gauss", 0.9997596437370099));
+        testCaseSuppliers.addAll(geoPointTestCase("POINT (12.3 45.6)", "POINT (1 1)", "10000km", "10km", 0.33, "gauss", 0.7519296165431535));
+        testCaseSuppliers.addAll(geoPointTestCase("POINT (180.0 90.0)", "POINT (1 1)", "10000km", "10km", 0.33, "gauss", 0.33837227875395753));
+        testCaseSuppliers.addAll(geoPointTestCase("POINT (-180.0 -90.0)", "POINT (1 1)", "10000km", "10km", 0.33, "gauss", 0.3220953501115956));
+
         // GeoPoint offset & scale as keywords
         testCaseSuppliers.addAll(geoPointTestCaseKeywordScale("POINT (1 1)", "POINT (1 1)", "200km", "0km", 0.5, "linear", 1.0));
         testCaseSuppliers.addAll(geoPointOffsetKeywordTestCase("POINT (1 1)", "POINT (1 1)", "200km", "0km", 0.5, "linear", 1.0));