1 files changed, 42 insertions, 0 deletions
diff --git a/spec/bundler/install/gemfile/platform_spec.rb b/spec/bundler/install/gemfile/platform_spec.rb
index 46fc393fe9..8ab59abeeb 100644
--- a/spec/bundler/install/gemfile/platform_spec.rb
+++ b/spec/bundler/install/gemfile/platform_spec.rb
@@ -299,6 +299,48 @@ RSpec.describe "bundle install across platforms" do
     bundle :install
     expect(vendored_gems("gems/rack-1.0.0")).to exist
   end
+
+  it "keeps existing platforms when installing with force_ruby_platform" do
+    lockfile <<-G
+      GEM
+        remote: #{file_uri_for(gem_repo1)}/
+        specs:
+          platform_specific (1.0-java)
+
+      PLATFORMS
+        java
+
+      DEPENDENCIES
+        platform_specific
+    G
+
+    bundle "config set --local force_ruby_platform true"
+
+    install_gemfile <<-G
+      source "#{file_uri_for(gem_repo1)}"
+      gem "platform_specific"
+    G
+
+    expect(the_bundle).to include_gem "platform_specific 1.0 RUBY"
+
+    lockfile_should_be <<-G
+      GEM
+        remote: #{file_uri_for(gem_repo1)}/
+        specs:
+          platform_specific (1.0)
+          platform_specific (1.0-java)
+
+      PLATFORMS
+        java
+        ruby
+
+      DEPENDENCIES
+        platform_specific
+
+      BUNDLED WITH
+         #{Bundler::VERSION}
+    G
+  end
 end
 
 RSpec.describe "bundle install with platform conditionals" do