[Resolver] Error when it is ambigous which transitive source a gem should come fromseg-multisource-error

1 files changed, 28 insertions, 1 deletions

diff --git a/spec/install/gemfile/sources_spec.rb b/spec/install/gemfile/sources_spec.rb
index 0b837f87a1..8d69a663de 100644
--- a/spec/install/gemfile/sources_spec.rb
+++ b/spec/install/gemfile/sources_spec.rb
@@ -545,7 +545,7 @@ RSpec.describe "bundle install with gems on multiple sources" do
       end
 
       it "does not re-resolve" do
-        bundle :install, :verbose => true
+        bundle! :install, :verbose => true
         expect(out).to include("using resolution from the lockfile")
         expect(out).not_to include("re-resolving dependencies")
       end
@@ -617,4 +617,31 @@ RSpec.describe "bundle install with gems on multiple sources" do
       end
     end
   end
+
+  context "when a gem is available from multiple ambiguous sources", :bundler => "2" do
+    it "raises, suggesting a source block" do
+      build_repo4 do
+        build_gem "depends_on_rack" do |s|
+          s.add_dependency "rack"
+        end
+        build_gem "rack"
+      end
+
+      install_gemfile <<-G
+        source "file:#{gem_repo4}"
+        source "file:#{gem_repo1}" do
+          gem "thin"
+        end
+        gem "depends_on_rack"
+      G
+      expect(last_command).to be_failure
+      expect(last_command.stderr).to eq strip_whitespace(<<-EOS).strip
+        The gem 'rack' was found in multiple relevant sources.
+          * rubygems repository file:#{gem_repo1}/ or installed locally
+          * rubygems repository file:#{gem_repo4}/ or installed locally
+        You must add this gem to the source block for the source you wish it to be installed from.
+      EOS
+      expect(the_bundle).not_to be_locked
+    end
+  end
 end