add unit test for utils/format-assets.js

Author: Elrey Belmonti

test/utils/format-assets.spec.js

@@ -0,0 +1,62 @@
+"use strict";
+
+const { expect } = require("chai");
+
+const { _getAssetSize, _getTotalSize, _printAssets } = require("../../utils/format-assets");
+
+describe("format-assets.js", () => {
+  describe("#_getAssetSize", () => {
+    context("when asset size is present", () => {
+      it("returns a readable file size as string", () => {
+        const asset = {
+          size: 500
+        };
+        expect(_getAssetSize(asset)).to.equal("500 B");
+      });
+    });
+
+    context("when no asset size is present", () => {
+      it("returns zero in a readable file size as string", () => {
+        const asset = {
+          size: undefined
+        };
+        expect(_getAssetSize(asset)).to.equal("0 B");
+      });
+    });
+  });
+
+  describe("#_getTotalSize", () => {
+    it("returns a readable file size of all assets as a string", () => {
+      const assets = [{ size: 500 }, { size: undefined }, { size: 1000 }];
+      expect(_getTotalSize(assets)).to.equal("1.46 KB");
+    });
+  });
+
+  describe("#_printAssets", () => {
+    it("returns a nested array of assets information", () => {
+      const assetList = [
+        {
+          name: "assest1",
+          size: 500
+        },
+        {
+          name: "assest2",
+          size: 0
+        },
+        {
+          name: "assest2",
+          size: 500
+        }
+      ];
+
+      const output = [
+        ["Name", "Size"],
+        ["assest1", "500 B"],
+        ["assest2", "0 B"],
+        ["assest2", "500 B"],
+        ["Total", "1000 B"]
+      ];
+      expect(_printAssets(assetList)).eql(output);
+    });
+  });
+});

utils/format-assets.js

@@ -5,25 +5,18 @@
  */
 const filesize = require("filesize");
 
-function getAssetSize(asset) {
+function _getAssetSize(asset) {
   return filesize(asset.size || 0);
 }
 
-function getTotalSize(assetsList) {
-  return filesize(assetsList.reduce(
-    (total, asset) => total + (asset.size || 0),
-    0
-  ));
+function _getTotalSize(assetsList) {
+  return filesize(assetsList.reduce((total, asset) => total + (asset.size || 0), 0));
 }
 
-function printAssets(assetsList) {
+function _printAssets(assetsList) {
   return [["Name", "Size"]]
-    .concat(assetsList.map(asset =>
-      [asset.name, getAssetSize(asset)]
-    ))
-    .concat(
-      [["Total", getTotalSize(assetsList)]]
-    );
+    .concat(assetsList.map(asset => [asset.name, _getAssetSize(asset)]))
+    .concat([["Total", _getTotalSize(assetsList)]]);
 }
 
 function formatAssets(assets) {
@@ -33,7 +26,10 @@ function formatAssets(assets) {
     size: assets[name].meta.full
   }));
 
-  return printAssets(assetsList);
+  return _printAssets(assetsList);
 }
 
-module.exports = formatAssets;
+module.exports = { formatAssets,
+  _getAssetSize,
+  _getTotalSize,
+  _printAssets };