diff --git a/package.json b/package.json
index 3c3e4363..c0a90859 100644
--- a/package.json
+++ b/package.json
@@ -13,12 +13,13 @@
     "build": "node_modules/.bin/parallel-webpack",
     "doc": "node_modules/.bin/jsdoc -c jsdoc-conf.json",
     "test": "node_modules/.bin/karma start --single-run --browsers=ChromeHeadless",
-    "test:all": "for pkg in core jquery jquery-file-upload; do node_modules/.bin/karma start --single-run --cloudinary.pkg=${pkg}; done",
-    "test:all:prod": "for pkg in core jquery jquery-file-upload; do node_modules/.bin/karma start --single-run --cloudinary.minified --cloudinary.pkg=${pkg}; done",
+    "test:pkgs": "for pkg in core jquery jquery-file-upload; do node_modules/.bin/karma start --single-run --cloudinary.pkg=${pkg}; done",
+    "test:pkgs:minified": "for pkg in core jquery jquery-file-upload; do node_modules/.bin/karma start --single-run --cloudinary.minified --cloudinary.pkg=${pkg}; done",
     "test:types": "node_modules/.bin/tsc",
+    "test:pkgs:verify": "jasmine test/spec/pkg-spec.js",
     "pretest": "npm run build",
-    "pretest:all": "npm run build",
-    "pretest:all:prod": "npm run build",
+    "pretest:pkgs": "npm run build",
+    "pretest:pkgs:minified": "npm run build",
     "copybuilds": "for pkg in core jquery jquery-file-upload; do pkg/copy_deployment ${pkg}; done",
     "publishnpm": "npm publish && for pkg in core jquery jquery-file-upload; do publish_to_npm ${pkg}; done"
   },
@@ -45,6 +46,7 @@
     "clean-webpack-plugin": "^1.0.1",
     "jasmine": "^3.4.0",
     "jasmine-core": "^3.4.0",
+    "jasmine-spec-reporter": "^4.2.1",
     "jquery": "^3.4.0",
     "karma": "^4.1.0",
     "karma-babel-preprocessor": "^8.0.0-beta.0",
diff --git a/test/spec/pkg-spec.js b/test/spec/pkg-spec.js
new file mode 100644
index 00000000..7800e7e0
--- /dev/null
+++ b/test/spec/pkg-spec.js
@@ -0,0 +1,100 @@
+/**
+ * Verify existance of all needed files in each package.
+ * This test file should be run before each release.
+ */
+
+const fs = require('fs');
+const path = require('path');
+const SpecReporter = require('jasmine-spec-reporter').SpecReporter;
+
+//Set jasmine reporter
+jasmine.getEnv().clearReporters();
+jasmine.getEnv().addReporter(new SpecReporter({
+  spec: {
+    displayPending: true
+  },
+}));
+
+const pkgPath = path.join(__dirname, '..', '..', 'pkg');
+const commonFiles = ['src', 'package.json', 'README.md'];
+
+const commonExtensions = {
+  extensions: ['d.ts', 'js', 'min.js', 'js.map'],
+  delimiter: '.'
+};
+
+const shrinkwrapExtensions = {
+  extensions: ['shrinkwrap.js', 'shrinkwrap.js.map', 'shrinkwrap.min.js'],
+  delimiter: '-'
+};
+
+const requiredPackages = [
+  createPackage('cloudinary-core', commonExtensions, shrinkwrapExtensions),
+  createPackage('cloudinary-jquery', commonExtensions),
+  createPackage('cloudinary-jquery-file-upload', commonExtensions)
+];
+
+/**
+ * Verify that a package has only required files
+ * @param pkg
+ */
+function verifyPackageConsistency(pkg) {
+  const actualFiles = fs.readdirSync(`${pkgPath}/${pkg.name}`);
+
+  describe(pkg.name, () => {
+    it('Should contain required files:', () => {
+      getArrayDiff(pkg.files, actualFiles).forEach(file => {
+        fail(file);
+      })
+    });
+    it('Should not contain redundant files:', () => {
+      getArrayDiff(actualFiles, pkg.files).forEach(file => {
+        fail(file);
+      })
+    });
+  });
+}
+
+/**
+ * Creates a package object with name and files
+ * @param pkgName
+ * @param withShrinkwrap
+ * @returns {{name: *, files: *}}
+ */
+function createPackage(pkgName, ...extensions) {
+  let files = [...commonFiles];
+  extensions.forEach(extensionsItem => {
+    files = extendFileList(files, pkgName, extensionsItem.extensions, extensionsItem.delimiter);
+  });
+
+  return {
+    name: pkgName,
+    files
+  };
+}
+
+/**
+ * Adds file names to given files array
+ * @param files
+ * @param pkgName
+ * @param extensions
+ * @param delimiter
+ * @returns {*}
+ */
+function extendFileList(files, pkgName, extensions, delimiter) {
+  return files.concat(extensions.map(extension => `${pkgName}${delimiter}${extension}`));
+}
+
+/**
+ * return items from arr1 that arr2 does not contain
+ * @param arr1
+ * @param arr2
+ * @returns {*}
+ */
+function getArrayDiff(arr1, arr2) {
+  return arr1.filter(item => !arr2.includes(item));
+}
+
+requiredPackages.forEach(pkg => {
+  verifyPackageConsistency(pkg);
+});