1 files changed, 47 insertions, 0 deletions
diff --git a/spec/bundler/bundler/installer/parallel_installer_spec.rb b/spec/bundler/bundler/installer/parallel_installer_spec.rb
new file mode 100644
index 0000000000..7d2c441399
--- /dev/null
+++ b/spec/bundler/bundler/installer/parallel_installer_spec.rb
@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+require "spec_helper"
+require "bundler/installer/parallel_installer"
+
+RSpec.describe Bundler::ParallelInstaller do
+  let(:installer) { instance_double("Installer") }
+  let(:all_specs) { [] }
+  let(:size) { 1 }
+  let(:standalone) { false }
+  let(:force) { false }
+
+  subject { described_class.new(installer, all_specs, size, standalone, force) }
+
+  context "when dependencies that are not on the overall installation list are the only ones not installed" do
+    let(:all_specs) do
+      [
+        build_spec("alpha", "1.0") {|s| s.runtime "a", "1" },
+      ].flatten
+    end
+
+    it "prints a warning" do
+      expect(Bundler.ui).to receive(:warn).with(<<-W.strip)
+Your lockfile was created by an old Bundler that left some things out.
+You can fix this by adding the missing gems to your Gemfile, running bundle install, and then removing the gems from your Gemfile.
+The missing gems are:
+* a depended upon by alpha
+      W
+      subject.check_for_corrupt_lockfile
+    end
+
+    context "when size > 1" do
+      let(:size) { 500 }
+
+      it "prints a warning and sets size to 1" do
+        expect(Bundler.ui).to receive(:warn).with(<<-W.strip)
+Your lockfile was created by an old Bundler that left some things out.
+Because of the missing DEPENDENCIES, we can only install gems one at a time, instead of installing 500 at a time.
+You can fix this by adding the missing gems to your Gemfile, running bundle install, and then removing the gems from your Gemfile.
+The missing gems are:
+* a depended upon by alpha
+        W
+        subject.check_for_corrupt_lockfile
+        expect(subject.size).to eq(1)
+      end
+    end
+  end
+end