diff --git a/packages/react-scripts/backpack-addons/splitChunks.js b/packages/react-scripts/backpack-addons/splitChunks.js
index 22abea25a04..b3d3a9a59ed 100644
--- a/packages/react-scripts/backpack-addons/splitChunks.js
+++ b/packages/react-scripts/backpack-addons/splitChunks.js
@@ -1,14 +1,8 @@
-'use strict';
-
-const paths = require('../config/paths');
-const appPackageJson = require(paths.appPackageJson);
-const bpkReactScriptsConfig = appPackageJson['backpack-react-scripts'] || {};
-
 /**
  * Defines a webpack splitChunks configuration, optionally based on consumer configuration.
- * 
+ *
  * For automatic configuration set enableAutomaticChunking and optionally provide a vendorsChunkRegex string, e.g:
- * 
+ *
  * // package.json
  * ...
  * "backpack-react-scripts": {
@@ -18,9 +12,9 @@ const bpkReactScriptsConfig = appPackageJson['backpack-react-scripts'] || {};
  *    ...
  * }
  * ...
- * 
+ *
  * For custom configuration disable enableAutomaticChunking and provide a configuration object, e.g:
- * 
+ *
  * // package.json
  * ...
  * "backpack-react-scripts": {
@@ -43,7 +37,7 @@ const bpkReactScriptsConfig = appPackageJson['backpack-react-scripts'] || {};
  *    ...
  * }
  * ...
- * 
+ *
  * References:
  * https://webpack.js.org/plugins/split-chunks-plugin/#optimizationsplitchunks
  * https://webpack.js.org/plugins/split-chunks-plugin/#splitchunkscachegroups
@@ -51,9 +45,14 @@ const bpkReactScriptsConfig = appPackageJson['backpack-react-scripts'] || {};
  * https://medium.com/webpack/webpack-4-code-splitting-chunk-graph-and-the-splitchunks-optimization-be739a861366
  */
 
-module.exports = (isEnvDevelopment) => {
+'use strict';
+
+const paths = require('../config/paths');
+const appPackageJson = require(paths.appPackageJson);
+const bpkReactScriptsConfig = appPackageJson['backpack-react-scripts'] || {};
 
-  let splitChunksConfig =  {}
+module.exports = isEnvDevelopment => {
+  let splitChunksConfig = {};
 
   // If opted in to automatic chunking, apply default configuration
   if (bpkReactScriptsConfig.enableAutomaticChunking) {
@@ -73,16 +72,22 @@ module.exports = (isEnvDevelopment) => {
     }
   }
   // If not opted in to automatic chunking, use custom configuration - if defined.
-  else if(bpkReactScriptsConfig.splitChunksConfig) {
-    // 
-    splitChunksConfig = { ...bpkReactScriptsConfig.splitChunksConfig, name: isEnvDevelopment}
-    // Regexes are passed as strings in package.json config, but need constructed here.
-    for(let cacheGroup of Object.keys(splitChunksConfig.cacheGroups)){
-      splitChunksConfig.cacheGroups[cacheGroup].test = new RegExp(splitChunksConfig.cacheGroups[cacheGroup].test);
+  else if (bpkReactScriptsConfig.splitChunksConfig) {
+    splitChunksConfig = {
+      ...bpkReactScriptsConfig.splitChunksConfig,
+      name: isEnvDevelopment,
+    };
+    if (splitChunksConfig.cacheGroups) {
+      // Regexes are passed as strings in package.json config, but need constructed here.
+      for (let cacheGroup of Object.keys(splitChunksConfig.cacheGroups)) {
+        splitChunksConfig.cacheGroups[cacheGroup].test = new RegExp(
+          splitChunksConfig.cacheGroups[cacheGroup].test
+        );
+      }
     }
   }
 
   return {
-    splitChunks: splitChunksConfig
+    splitChunks: splitChunksConfig,
   };
 };
diff --git a/packages/react-scripts/backpack-addons/splitChunks.test.js b/packages/react-scripts/backpack-addons/splitChunks.test.js
new file mode 100644
index 00000000000..6d945e98a1a
--- /dev/null
+++ b/packages/react-scripts/backpack-addons/splitChunks.test.js
@@ -0,0 +1,234 @@
+'use strict';
+
+jest.mock('../config/paths', () => ({
+  appPackageJson: './test/mockPackage.json',
+}));
+
+describe('splitChunks', () => {
+  const mockData = {
+    name: 'test',
+    version: '1.0.0',
+    'backpack-react-scripts': {},
+  };
+
+  let isEnvDevelopment = true;
+
+  beforeEach(() => {
+    jest.resetModules();
+  });
+
+  test('should return default if no config defined', () => {
+    jest.doMock('./test/mockPackage.json', () => ({
+      ...mockData,
+      'backpack-react-scripts': {},
+    }));
+    const splitChunks = require('../backpack-addons/splitChunks');
+
+    let res = splitChunks(isEnvDevelopment);
+
+    expect(res).toEqual({ splitChunks: {} });
+  });
+
+  test('should apply basic defaults if automatic chunking enabled without vendors regex', () => {
+    jest.doMock('./test/mockPackage.json', () => ({
+      ...mockData,
+      'backpack-react-scripts': {
+        enableAutomaticChunking: true,
+      },
+    }));
+    const splitChunks = require('../backpack-addons/splitChunks');
+
+    let res = splitChunks(isEnvDevelopment);
+
+    expect(res).toEqual({
+      splitChunks: { chunks: 'all', name: true, cacheGroups: {} },
+    });
+  });
+
+  test('should return empty if automatic chunking false and no other config is defined', () => {
+    jest.doMock('./test/mockPackage.json', () => ({
+      ...mockData,
+      'backpack-react-scripts': {
+        enableAutomaticChunking: false,
+      },
+    }));
+    const splitChunks = require('../backpack-addons/splitChunks');
+
+    let res = splitChunks(isEnvDevelopment);
+
+    expect(res).toEqual({ splitChunks: {} });
+  });
+
+  test('should apply basic defaults and cacheGroup with vendors RegExp when automatic chunking enabled and vendors regex provided', () => {
+    jest.doMock('./test/mockPackage.json', () => ({
+      ...mockData,
+      'backpack-react-scripts': {
+        enableAutomaticChunking: true,
+        vendorsChunkRegex: '[\\/]node_modules[\\/]',
+      },
+    }));
+    const splitChunks = require('../backpack-addons/splitChunks');
+
+    let res = splitChunks(isEnvDevelopment);
+
+    expect(res).toEqual({
+      splitChunks: {
+        chunks: 'all',
+        name: true,
+        cacheGroups: { vendors: { test: expect.any(RegExp) } },
+      },
+    });
+  });
+
+  test('should return empty when automatic chunking disabled and vendors regex provided', () => {
+    jest.doMock('./test/mockPackage.json', () => ({
+      ...mockData,
+      'backpack-react-scripts': {
+        enableAutomaticChunking: false,
+        vendorsChunkRegex: '[\\/]node_modules[\\/]',
+      },
+    }));
+    const splitChunks = require('../backpack-addons/splitChunks');
+
+    let res = splitChunks(isEnvDevelopment);
+
+    expect(res).toEqual({ splitChunks: {} });
+  });
+
+  test('should ignore custom config when automatic chunking enabled and splitChunksConfig is also defined', () => {
+    jest.doMock('./test/mockPackage.json', () => ({
+      ...mockData,
+      'backpack-react-scripts': {
+        enableAutomaticChunking: true,
+        splitChunksConfig: {
+          cacheGroups: {
+            vendors: {
+              test: '[\\/]node_modules[\\/]',
+            },
+            someCustomChunk: {
+              test: '[\\/]some_regex[\\/]',
+              priority: 100,
+              chunks: 'all',
+              name: 'someCustomChunk',
+            },
+          },
+        },
+      },
+    }));
+    const splitChunks = require('../backpack-addons/splitChunks');
+
+    let res = splitChunks(isEnvDevelopment);
+
+    expect(res).toEqual({
+      splitChunks: { chunks: 'all', name: true, cacheGroups: {} },
+    });
+  });
+
+  test('should not ignore custom config when automatic chunking disabled and splitChunksConfig is defined', () => {
+    jest.doMock('./test/mockPackage.json', () => ({
+      ...mockData,
+      'backpack-react-scripts': {
+        enableAutomaticChunking: false,
+        splitChunksConfig: {
+          chunks: 'all',
+          cacheGroups: {
+            vendors: {
+              test: '[\\/]node_modules[\\/]',
+            },
+          },
+        },
+      },
+    }));
+    const splitChunks = require('../backpack-addons/splitChunks');
+
+    let res = splitChunks(isEnvDevelopment);
+
+    expect(res).toEqual({
+      splitChunks: {
+        chunks: 'all',
+        name: true,
+        cacheGroups: {
+          vendors: {
+            test: expect.any(RegExp),
+          },
+        },
+      },
+    });
+  });
+
+  test('should apply only the name field when splitChunks is empty', () => {
+    jest.doMock('./test/mockPackage.json', () => ({
+      ...mockData,
+      'backpack-react-scripts': {
+        enableAutomaticChunking: false,
+        splitChunksConfig: {},
+      },
+    }));
+    const splitChunks = require('../backpack-addons/splitChunks');
+
+    let res = splitChunks(isEnvDevelopment);
+
+    expect(res).toEqual({ splitChunks: { name: true } });
+  });
+
+  test('should apply Regexes when multiple cacheGroups are applied', () => {
+    jest.doMock('./test/mockPackage.json', () => ({
+      ...mockData,
+      'backpack-react-scripts': {
+        enableAutomaticChunking: false,
+        splitChunksConfig: {
+          chunks: 'all',
+          cacheGroups: {
+            vendors: {
+              test: '[\\/]node_modules[\\/]',
+            },
+            someCustomChunk: {
+              test: '[\\/]some_regex[\\/]',
+              priority: 100,
+              chunks: 'all',
+              name: 'someCustomChunk',
+            },
+          },
+        },
+      },
+    }));
+    const splitChunks = require('../backpack-addons/splitChunks');
+
+    let res = splitChunks(isEnvDevelopment);
+
+    expect(res).toEqual({
+      splitChunks: {
+        chunks: 'all',
+        name: true,
+        cacheGroups: {
+          vendors: {
+            test: expect.any(RegExp),
+          },
+          someCustomChunk: {
+            test: expect.any(RegExp),
+            priority: 100,
+            chunks: 'all',
+            name: 'someCustomChunk',
+          },
+        },
+      },
+    });
+  });
+
+  test('should apply isEnvDevelopment boolean as name value', () => {
+    let isEnvDevelopment = false;
+    jest.doMock('./test/mockPackage.json', () => ({
+      ...mockData,
+      'backpack-react-scripts': {
+        enableAutomaticChunking: true,
+      },
+    }));
+    const splitChunks = require('../backpack-addons/splitChunks');
+
+    let res = splitChunks(isEnvDevelopment);
+
+    expect(res).toEqual({
+      splitChunks: { chunks: 'all', name: false, cacheGroups: {} },
+    });
+  });
+});
diff --git a/packages/react-scripts/package.json b/packages/react-scripts/package.json
index fb019a53ddd..931a086a6d7 100644
--- a/packages/react-scripts/package.json
+++ b/packages/react-scripts/package.json
@@ -21,6 +21,9 @@
     "utils",
     "backpack-addons"
   ],
+  "scripts": {
+    "test:addons": "jest --testPathPattern=backpack-addons"
+  },
   "bin": {
     "react-scripts": "./bin/react-scripts.js"
   },