Add a multiplier to the matrix (#5298)

* add a multiplier to the matrix

* add rounding

* remove scale_factor restrictions

* clamp for overflow error

* update check to match error message

* enforce clamping on < 0 and increase test coverage

* add an invalid scale_factor value to node tests

* increase test coverage

* changelog

test/nodejs/table.js

@@ -260,5 +260,23 @@ tables.forEach(function(annotation) {
         });
     });
 
+    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'});
+        var options = {
+            coordinates: two_test_coordinates,
+            annotations: [annotation.slice(0,-1)],
+            scale_factor: -1
+        };
+
+        assert.throws(()=>osrm.table(options, (err, res) => {}), /scale_factor must be > 0/, "should throw on invalid scale_factor value");
+
+        options.scale_factor = '-1';
+        assert.throws(()=>osrm.table(options, (err, res) => {}), /scale_factor must be a number/, "should throw on invalid scale_factor value");
+
+        options.scale_factor = 0;
+        assert.throws(()=>osrm.table(options, (err, res) => {}), /scale_factor must be > 0/, "should throw on invalid scale_factor value");
+
+    });
 });