test: make expectations work for npm 5 to 7

This addresses the following changes in behavior.

Saved GitHub URL format in package.json:
- npm 6: git+https://github.com/apache/cordova-android.git#4.1.x
- npm 7: github:apache/cordova-android#4.1.x

Empty devDependencies format in package.json:
- npm 6: `{}`
- npm 7: `undefined`

spec/fetch.spec.js

@@ -57,7 +57,7 @@ function expectNotToBeInstalled (pkgName) {
 
 function expectDevDependenciesToBe (deps) {
     const rootPJ = fs.readJsonSync(path.join(tmpDir, 'package.json'));
-    expect(rootPJ.devDependencies).toEqual(deps);
+    expect(rootPJ.devDependencies || {}).toEqual(deps);
 }
 
 describe('fetch/uninstall tests via npm & git', () => {
@@ -101,7 +101,7 @@ describe('fetch/uninstall with --save', () => {
                 name: 'cordova-ios',
                 version: '5.0.1'
             }))
-            .then(_ => expectDevDependenciesToBe({ 'cordova-ios': 'git+https://github.com/apache/cordova-ios.git#rel/5.0.1' }))
+            .then(_ => expectDevDependenciesToBe({ 'cordova-ios': jasmine.stringMatching('#rel/5.0.1') }))
             .then(_ => uninstall('cordova-ios', tmpDir, opts))
             .then(_ => expectDevDependenciesToBe({}))
             .then(_ => expectNotToBeInstalled('cordova-ios'))
@@ -111,18 +111,19 @@ describe('fetch/uninstall with --save', () => {
                 name: 'cordova-android',
                 version: '4.1.1'
             }))
-            .then(_ => expectDevDependenciesToBe({ 'cordova-android': 'git+https://github.com/apache/cordova-android.git#4.1.x' }))
+            .then(_ => expectDevDependenciesToBe({ 'cordova-android': jasmine.stringMatching('#4.1.x') }))
             .then(_ => uninstall('cordova-android', tmpDir, opts));
     }, 150000);
 
     it('should fetch and uninstall a cordova plugin via git commit sha', () => {
-        const URL = 'https://github.com/apache/cordova-plugin-contacts.git#7db612115755c2be73a98dda76ff4c5fd9d8a575';
+        const SHA = '7db612115755c2be73a98dda76ff4c5fd9d8a575';
+        const URL = `https://github.com/apache/cordova-plugin-contacts.git#${SHA}`;
         return Promise.resolve()
             .then(_ => fetchAndMatch(URL, {
                 name: 'cordova-plugin-contacts',
                 version: '2.0.2-dev'
             }))
-            .then(_ => expectDevDependenciesToBe({ 'cordova-plugin-contacts': `git+${URL}` }))
+            .then(_ => expectDevDependenciesToBe({ 'cordova-plugin-contacts': jasmine.stringMatching(`#${SHA}`) }))
             .then(_ => uninstall('cordova-plugin-contacts', tmpDir, opts))
             .then(_ => expectDevDependenciesToBe({}))
             .then(_ => expectNotToBeInstalled('cordova-plugin-contacts'));