Fixed scenario for importing a PR with package.json changed

If package.json has changed you should be able to run `kpm install --save` to udpate offline mirror and fbkpm.lock with latest package.json.

Author: bestander

src/cli/commands/install.js

@@ -337,7 +337,7 @@ function isStrictLockfile(flags: Object, args: Array<string>): boolean {
  */
 
 function shouldWriteLockfileIfExists(flags: Object, args: Array<string>): boolean {
-  if (args.length) {
+  if (args.length || flags.save) {
     return shouldWriteLockfile(flags, args);
   } else {
     return false;

test/commands/install.js

@@ -647,8 +647,7 @@ test("uninstall should remove subdependencies", () => {
   });
 });
 
-// TODO https://github.com/facebook/fbkpm/issues/77
-test.failing("[network] install --save should add missing deps to fbkpm and mirror (PR import scenario)",
+test("[network] install --save should add missing deps to fbkpm and mirror (PR import scenario)",
 async () => {
   let mirrorPath = "mirror-for-offline";
   let fixture = "install-import-pr";
@@ -668,7 +667,6 @@ async () => {
 
     let lockFileContent = await fs.readFile(path.join(config.cwd, "fbkpm.lock"));
     let lockFileLines = lockFileContent.split("\n").filter((line) => !!line);
-    // TODO error here
     assert.equal(lockFileLines.length, 14);
     assert.equal(lockFileLines[4].indexOf("mime-db@"), 0);
     assert.equal(lockFileLines[8].indexOf("mime-types@2.0.0"), 0);