Auto merge of #6328 - bundler:seg-spec-lock-no-download, r=colby-swandale

Add a spec for bundle lock not downloading gems

### What was the end-user problem that led to this PR?

The problem was we were unsure (in https://github.com/bundler/bundler/issues/6312) whether lock had this behavior.

### What was your diagnosis of the problem?

My diagnosis was it did, and I came to that conclusion via this test!

1 files changed, 13 insertions, 0 deletions

diff --git a/spec/commands/lock_spec.rb b/spec/commands/lock_spec.rb
index b08cc865b1..bd5bdfff2f 100644
--- a/spec/commands/lock_spec.rb
+++ b/spec/commands/lock_spec.rb
@@ -114,6 +114,19 @@ RSpec.describe "bundle lock" do
     expect(read_lockfile).to eq(@lockfile)
   end
 
+  it "can lock without downloading gems" do
+    gemfile <<-G
+      source "file://#{gem_repo1}"
+
+      gem "thin"
+      gem "rack_middleware", :group => "test"
+    G
+    bundle! "config set without test"
+    bundle! "config set path .bundle"
+    bundle! "lock"
+    expect(bundled_app(".bundle")).not_to exist
+  end
+
   # see update_spec for more coverage on same options. logic is shared so it's not necessary
   # to repeat coverage here.
   context "conservative updates" do