Fix fallback speed validity checks (#5300)

* fix fallback_speeds check to only accept values > 0

* add invalid_fallback_speed

test/nodejs/table.js

@@ -260,6 +260,29 @@ tables.forEach(function(annotation) {
         });
     });
 
+    test('table: ' + annotation + ' table in Monaco with invalid fallback speeds and fallback coordinates', function(assert) {
+        assert.plan(4);
+        var osrm = new OSRM({path: mld_data_path, algorithm: 'MLD'});
+        var options = {
+            coordinates: two_test_coordinates,
+            annotations: [annotation.slice(0,-1)],
+            fallback_speed: -1
+        };
+
+        assert.throws(()=>osrm.table(options, (err, res) => {}), /fallback_speed must be > 0/, "should throw on invalid fallback_speeds");
+
+        options.fallback_speed = '10';
+        assert.throws(()=>osrm.table(options, (err, res) => {}), /fallback_speed must be a number/, "should throw on invalid fallback_speeds");
+
+        options.fallback_speed = 10;
+        options.fallback_coordinate = 'bla';
+        assert.throws(()=>osrm.table(options, (err, res) => {}), /fallback_coordinate' param must be one of \[input, snapped\]/, "should throw on invalid fallback_coordinate");
+
+        options.fallback_coordinate = 10;
+        assert.throws(()=>osrm.table(options, (err, res) => {}), /fallback_coordinate must be a string: \[input, snapped\]/, "should throw on invalid fallback_coordinate");
+
+    });
+
     test('table: ' + annotation + ' table in Monaco with invalid scale factor', function(assert) {
         assert.plan(3);
         var osrm = new OSRM({path: mld_data_path, algorithm: 'MLD'});