Enforce callback error handling

test/unit/backends/turbo-carto-postgres-datasource-test.js

@@ -33,6 +33,7 @@ describe('turbo-carto-postgres-datasource', function () {
         var buckets = 4;
         var method = 'equal';
         this.datasource.getRamp(column, buckets, method, function (err, result) {
+            assert.ifError(err);
             var expected_result = {
                 ramp: [252, 501, 750, 999],
                 stats: { min_val: 3, max_val: 999, avg_val: 501 },

test/unit/lzma-middleware-test.js

@@ -13,6 +13,10 @@ describe('lzma-middleware', function () {
             }
         };
         testHelper.lzma_compress_to_base64(JSON.stringify(qo), 1, function (err, data) {
+            if (err) {
+                return done(err);
+            }
+
             const lzma = lzmaMiddleware();
             var req = {
                 headers: {

test/unit/mapconfig/dataviews-widgets-adapter-test.js

@@ -250,6 +250,7 @@ describe('dataviews-widgets-adapter', function () {
     widgetsMapConfigs.forEach(function (mapConfig, index) {
         it('should adapt widgets ' + index, function (done) {
             dataviewsMapConfigAdapter.getMapConfig(user, mapConfig.input, params(), context(), function (err, result) {
+                assert.ifError(err);
                 assert.deepStrictEqual(result, mapConfig.expected);
                 done();
             });