Update the error message format in bundler

spec/bundler/bundler/bundler_spec.rb

@@ -7,7 +7,7 @@ RSpec.describe Bundler do
   describe "#load_marshal" do
     it "is a private method and raises an error" do
       data = Marshal.dump(Bundler)
-      expect { Bundler.load_marshal(data) }.to raise_error(NoMethodError, /private method `load_marshal' called/)
+      expect { Bundler.load_marshal(data) }.to raise_error(NoMethodError, /private method [`']load_marshal' called/)
     end
 
     it "loads any data" do

spec/bundler/commands/exec_spec.rb

@@ -831,8 +831,7 @@ RSpec.describe "bundle exec" do
       let(:executable) { super() << "\nraise 'ERROR'" }
       let(:exit_code) { 1 }
       let(:expected_err) do
-        "bundler: failed to load command: #{path} (#{path})" \
-        "\n#{path}:10:in `<top (required)>': ERROR (RuntimeError)"
+        /\Abundler: failed to load command: #{Regexp.quote(path.to_s)} \(#{Regexp.quote(path.to_s)}\)\n#{Regexp.quote(path.to_s)}:10:in [`']<top \(required\)>': ERROR \(RuntimeError\)/
       end
 
       it "runs like a normally executed executable" do
@@ -840,7 +839,7 @@ RSpec.describe "bundle exec" do
 
         subject
         expect(exitstatus).to eq(exit_code)
-        expect(err).to start_with(expected_err)
+        expect(err).to match(expected_err)
         expect(out).to eq(expected)
       end
     end

spec/bundler/runtime/setup_spec.rb

@@ -1532,7 +1532,7 @@ end
       RUBY
 
       expect(last_command.stdboth).not_to include "FAIL"
-      expect(err).to include "private method `require'"
+      expect(err).to match /private method [`']require'/
     end
 
     it "memoizes initial set of specs when requiring bundler/setup, so that even if further code mutates dependencies, Bundler.definition.specs is not affected" do