Add GeoPoint Linear testcases

Author: timgrein

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

@@ -101,8 +101,14 @@ public static Iterable<Object[]> parameters() {
         testCaseSuppliers.addAll(doubleTestCase(300000.0, 10.0, 10000000.0, 200.0, 0.25, "gauss", 0.9987548570291238));
         testCaseSuppliers.addAll(doubleTestCase(123456789112.123, 10.0, 10000000.0, 200.0, 0.25, "gauss", 0.0));
 
-        // GeoPoint
-        testCaseSuppliers.addAll(geoPointTestCase("POINT (1 1)", "POINT (1 1)", "200km", "0km", 0.5, "linear", 1.0));
+        // GeoPoint Linear
+        testCaseSuppliers.addAll(geoPointTestCase("POINT (1.0 1.0)", "POINT (1 1)", "10000km", "10km", 0.33, "linear", 1.0));
+        testCaseSuppliers.addAll(geoPointTestCase("POINT (0 0)", "POINT (1 1)", "10000km", "10km", 0.33, "linear", 0.9901342769495362));
+        testCaseSuppliers.addAll(geoPointTestCase("POINT (12.3 45.6)", "POINT (1 1)", "10000km", "10km", 0.33, "linear", 0.6602313771587869));
+        testCaseSuppliers.addAll(geoPointTestCase("POINT (180.0 90.0)", "POINT (1 1)", "10000km", "10km", 0.33, "linear", 0.33761373954395957));
+        testCaseSuppliers.addAll(geoPointTestCase("POINT (-180.0 -90.0)", "POINT (1 1)", "10000km", "10km", 0.33, "linear", 0.32271359885955425));
+
+        // 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));