1 files changed, 64 insertions, 3 deletions
diff --git a/spec/bundler/install/gems/flex_spec.rb b/spec/bundler/install/gems/flex_spec.rb
index f9b374cf01..28ffaff3d5 100644
--- a/spec/bundler/install/gems/flex_spec.rb
+++ b/spec/bundler/install/gems/flex_spec.rb
@@ -156,7 +156,7 @@ RSpec.describe "bundle flex_install" do
     end
   end
 
-  describe "when Gemfile conflicts with lockfile" do
+  describe "when running bundle install and Gemfile conflicts with lockfile" do
     before(:each) do
       build_repo2
       install_gemfile <<-G
@@ -190,7 +190,7 @@ RSpec.describe "bundle flex_install" do
       expect(err).to match(/could not find gem 'rack-obama/i)
     end
 
-    it "suggests bundle update when the Gemfile requires different versions than the lock" do
+    it "suggests deleting the Gemfile.lock file when the Gemfile requires different versions than the lock" do
       bundle "config set force_ruby_platform true"
 
       nice_error = <<-E.strip.gsub(/^ {8}/, "")
@@ -205,7 +205,7 @@ RSpec.describe "bundle flex_install" do
             rack_middleware was resolved to 1.0, which depends on
               rack (= 0.9.1)
 
-        Running `bundle update` will rebuild your snapshot from scratch, using only
+        Deleting your Gemfile.lock file and running `bundle install` will rebuild your snapshot from scratch, using only
         the gems in your Gemfile, which may resolve the conflict.
       E
 
@@ -214,6 +214,67 @@ RSpec.describe "bundle flex_install" do
     end
   end
 
+  describe "when running bundle update and Gemfile conflicts with lockfile" do
+    before(:each) do
+      build_repo4 do
+        build_gem "jekyll-feed", "0.16.0"
+        build_gem "jekyll-feed", "0.15.1"
+
+        build_gem "github-pages", "226" do |s|
+          s.add_dependency "jekyll-feed", "0.15.1"
+        end
+      end
+
+      install_gemfile <<-G
+        source "#{file_uri_for(gem_repo4)}"
+        gem "jekyll-feed", "~> 0.12"
+      G
+
+      puts lockfile
+      lockfile <<-L
+        GEM
+          remote: #{file_uri_for(gem_repo4)}/
+          specs:
+            jekyll-feed (0.16.0)
+
+        PLATFORMS
+          #{lockfile_platforms}
+
+        DEPENDENCIES
+          jekyll-feed
+
+        BUNDLED WITH
+           #{Bundler::VERSION}
+      L
+
+      gemfile <<-G
+        source "#{file_uri_for(gem_repo4)}"
+        gem "github-pages", "~> 226"
+        gem "jekyll-feed", "~> 0.12"
+      G
+    end
+
+    it "suggests deleting the Gemfile.lock file when the Gemfile requires different versions than the lock" do
+      nice_error = <<-E.strip.gsub(/^ {8}/, "")
+        Bundler could not find compatible versions for gem "jekyll-feed":
+          In snapshot (Gemfile.lock):
+            jekyll-feed (>= 0.16.0)
+
+          In Gemfile:
+            jekyll-feed (~> 0.12)
+
+            github-pages (~> 226) was resolved to 226, which depends on
+              jekyll-feed (= 0.15.1)
+
+        Deleting your Gemfile.lock file and running `bundle install` will rebuild your snapshot from scratch, using only
+        the gems in your Gemfile, which may resolve the conflict.
+      E
+
+      bundle :update, :raise_on_error => false
+      expect(err).to end_with(nice_error)
+    end
+  end
+
   describe "subtler cases" do
     before :each do
       install_gemfile <<-G