1 files changed, 23 insertions, 5 deletions
diff --git a/test/rubygems/test_gem_resolver_installer_set.rb b/test/rubygems/test_gem_resolver_installer_set.rb
index 76c9c04a3c..928a16b9d3 100644
--- a/test/rubygems/test_gem_resolver_installer_set.rb
+++ b/test/rubygems/test_gem_resolver_installer_set.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
-require 'rubygems/test_case'
+require_relative 'helper'
 
 class TestGemResolverInstallerSet < Gem::TestCase
   def test_add_always_install
@@ -16,7 +16,7 @@ class TestGemResolverInstallerSet < Gem::TestCase
 
     assert_equal %w[a-2], set.always_install.map {|s| s.full_name }
 
-    e = assert_raises Gem::UnsatisfiableDependencyError do
+    e = assert_raise Gem::UnsatisfiableDependencyError do
       set.add_always_install dep('b')
     end
 
@@ -29,7 +29,7 @@ class TestGemResolverInstallerSet < Gem::TestCase
 
     set = Gem::Resolver::InstallerSet.new :both
 
-    e = assert_raises Gem::UnsatisfiableDependencyError do
+    e = assert_raise Gem::UnsatisfiableDependencyError do
       set.add_always_install dep 'a'
     end
 
@@ -64,6 +64,24 @@ class TestGemResolverInstallerSet < Gem::TestCase
     assert_equal %w[a-1], set.always_install.map {|s| s.full_name }
   end
 
+  def test_add_always_install_prerelease_github_problem
+    spec_fetcher do |fetcher|
+      fetcher.gem 'a', 1
+    end
+
+    # Github has an issue in which it will generate a misleading prerelease output in its RubyGems server API and
+    # returns a 0 version for the gem while it doesn't exist.
+    @fetcher.data["#{@gem_repo}prerelease_specs.#{Gem.marshal_version}.gz"] = util_gzip(Marshal.dump([
+      Gem::NameTuple.new('a', Gem::Version.new(0), 'ruby'),
+    ]))
+
+    set = Gem::Resolver::InstallerSet.new :both
+
+    set.add_always_install dep('a')
+
+    assert_equal %w[a-1], set.always_install.map {|s| s.full_name }
+  end
+
   def test_add_always_install_prerelease_only
     spec_fetcher do |fetcher|
       fetcher.gem 'a', '3.a'
@@ -71,7 +89,7 @@ class TestGemResolverInstallerSet < Gem::TestCase
 
     set = Gem::Resolver::InstallerSet.new :both
 
-    assert_raises Gem::UnsatisfiableDependencyError do
+    assert_raise Gem::UnsatisfiableDependencyError do
       set.add_always_install dep('a')
     end
   end
@@ -192,7 +210,7 @@ class TestGemResolverInstallerSet < Gem::TestCase
     def (set.remote_set).prefetch(_)
       raise "called"
     end
-    assert_raises(RuntimeError){ set.prefetch(nil) }
+    assert_raise(RuntimeError){ set.prefetch(nil) }
 
     set = Gem::Resolver::InstallerSet.new :local
     def (set.remote_set).prefetch(_)