Make bundle add caches newly added gems when needed.

2 files changed, 10 insertions, 0 deletions

diff --git a/lib/bundler/cli/add.rb b/lib/bundler/cli/add.rb
index 7c6235f17c..07b951f1ef 100644
--- a/lib/bundler/cli/add.rb
+++ b/lib/bundler/cli/add.rb
@@ -21,6 +21,7 @@ module Bundler
 
     def perform_bundle_install
       Installer.install(Bundler.root, Bundler.definition)
+      Bundler.load.cache if Bundler.app_cache.exist?
     end
 
     def inject_dependencies
diff --git a/spec/commands/add_spec.rb b/spec/commands/add_spec.rb
index fdfca5d8f2..35fd43d3d2 100644
--- a/spec/commands/add_spec.rb
+++ b/spec/commands/add_spec.rb
@@ -239,4 +239,13 @@ RSpec.describe "bundle add" do
       expect(err).not_to include("You may also need to change the version requirement specified in the Gemfile if it's too restrictive")
     end
   end
+
+  describe "when a gem is added and cache exists" do
+    it "caches all new dependencies added for the specified gem" do
+      bundle! :cache
+
+      bundle "add 'rack' --version=1.0.0"
+      expect(bundled_app("vendor/cache/rack-1.0.0.gem")).to exist
+    end
+  end
 end