Fix jest test suites (#268)

* CRLF to LF

* add babel-jest

* use ES6 style imports

* fix bugs manifest by test suite

* add babel test config

client/__tests__/util/bitArray.test.js

@@ -1,6 +1,7 @@
 // jshint esversion: 6
 
-const BitArray = require("../../src/util/typedCrossfilter/bitArray");
+import BitArray from "../../src/util/typedCrossfilter/bitArray";
+
 const defaultTestLength = 8;
 
 describe("default select state", () => {

client/__tests__/util/positiveInterval.test.js

@@ -1,6 +1,7 @@
 // jshint esversion: 6
 
-const PositiveIntervals = require("../../src/util/typedCrossfilter/positiveIntervals");
+// const PositiveIntervals = require("../../src/util/typedCrossfilter/positiveIntervals");
+import PositiveIntervals from "../../src/util/typedCrossfilter/positiveIntervals";
 
 describe("canonicalize", () => {
   test("empty", () => {

client/__tests__/util/typedCrossfilter.test.js

@@ -1,6 +1,6 @@
 // jshint esversion: 6
-const _ = require("lodash");
-const crossfilter = require("../../src/util/typedCrossfilter");
+import _ from "lodash";
+import crossfilter from "../../src/util/typedCrossfilter";
 
 const someData = [
   {

client/package.json

@@ -59,6 +59,7 @@
     "autoprefixer": "^9.1.1",
     "babel-core": "^6.13.2",
     "babel-eslint": "^8.2.6",
+    "babel-jest": "^23.6.0",
     "babel-loader": "^7.1.2",
     "babel-plugin-istanbul": "^4.1.6",
     "babel-plugin-transform-decorators-legacy": "^1.3.4",
@@ -105,5 +106,17 @@
       "**/__tests__/**/?(*.)(spec|test).js?(x)"
     ],
     "testURL": "http://localhost/"
+  },
+  "babel": {
+    "env": {
+      "test": {
+        "presets": [
+          [
+            "env"
+          ],
+          "react"
+        ]
+      }
+    }
   }
 }

client/src/util/typedCrossfilter/index.js

@@ -401,7 +401,11 @@ class ScalarGroup {
     this.dimension = dimension;
 
     // generate group names from dimension values
-    this.mapValue = this._map(groupValue, groupValueType, dimension);
+    this.mapValue = this.constructor._map(
+      groupValue,
+      groupValueType,
+      dimension
+    );
 
     // group index is mapping from data record index to group index
     this.groupIndex = new Uint32Array(dimension.crossfilter.data.length);
@@ -469,7 +473,7 @@ class ScalarGroup {
 
     // Each item in the range will be remved from `dim`.  reduceRemove if it
     // is currently selected.
-    const { data, selection } = this.dimension.crossfilter.selection;
+    const { data, selection } = this.dimension.crossfilter;
     intv.forEach(rng => {
       for (let r = rng[0]; r < rng[1]; r += 1) {
         const i = dim.index[r];