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diff --git a/spec/bundler/commands/config_spec.rb b/spec/bundler/commands/config_spec.rb
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+++ b/spec/bundler/commands/config_spec.rb
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+# frozen_string_literal: true
+require "spec_helper"
+
+RSpec.describe ".bundle/config" do
+  before :each do
+    gemfile <<-G
+      source "file://#{gem_repo1}"
+      gem "rack", "1.0.0"
+    G
+  end
+
+  describe "config" do
+    before { bundle "config foo bar" }
+
+    it "prints a detailed report of local and user configuration" do
+      bundle "config"
+
+      expect(out).to include("Settings are listed in order of priority. The top value will be used")
+      expect(out).to include("foo\nSet for the current user")
+      expect(out).to include(": \"bar\"")
+    end
+
+    context "given --parseable flag" do
+      it "prints a minimal report of local and user configuration" do
+        bundle "config --parseable"
+        expect(out).to include("foo=bar")
+      end
+
+      context "with global config" do
+        it "prints config assigned to local scope" do
+          bundle "config --local foo bar2"
+          bundle "config --parseable"
+          expect(out).to include("foo=bar2")
+        end
+      end
+
+      context "with env overwrite" do
+        it "prints config with env" do
+          bundle "config --parseable", :env => { "BUNDLE_FOO" => "bar3" }
+          expect(out).to include("foo=bar3")
+        end
+      end
+    end
+  end
+
+  describe "BUNDLE_APP_CONFIG" do
+    it "can be moved with an environment variable" do
+      ENV["BUNDLE_APP_CONFIG"] = tmp("foo/bar").to_s
+      bundle "install --path vendor/bundle"
+
+      expect(bundled_app(".bundle")).not_to exist
+      expect(tmp("foo/bar/config")).to exist
+      expect(the_bundle).to include_gems "rack 1.0.0"
+    end
+
+    it "can provide a relative path with the environment variable" do
+      FileUtils.mkdir_p bundled_app("omg")
+      Dir.chdir bundled_app("omg")
+
+      ENV["BUNDLE_APP_CONFIG"] = "../foo"
+      bundle "install --path vendor/bundle"
+
+      expect(bundled_app(".bundle")).not_to exist
+      expect(bundled_app("../foo/config")).to exist
+      expect(the_bundle).to include_gems "rack 1.0.0"
+    end
+  end
+
+  describe "global" do
+    before(:each) { bundle :install }
+
+    it "is the default" do
+      bundle "config foo global"
+      run "puts Bundler.settings[:foo]"
+      expect(out).to eq("global")
+    end
+
+    it "can also be set explicitly" do
+      bundle! "config --global foo global"
+      run! "puts Bundler.settings[:foo]"
+      expect(out).to eq("global")
+    end
+
+    it "has lower precedence than local" do
+      bundle "config --local  foo local"
+
+      bundle "config --global foo global"
+      expect(out).to match(/Your application has set foo to "local"/)
+
+      run "puts Bundler.settings[:foo]"
+      expect(out).to eq("local")
+    end
+
+    it "has lower precedence than env" do
+      begin
+        ENV["BUNDLE_FOO"] = "env"
+
+        bundle "config --global foo global"
+        expect(out).to match(/You have a bundler environment variable for foo set to "env"/)
+
+        run "puts Bundler.settings[:foo]"
+        expect(out).to eq("env")
+      ensure
+        ENV.delete("BUNDLE_FOO")
+      end
+    end
+
+    it "can be deleted" do
+      bundle "config --global foo global"
+      bundle "config --delete foo"
+
+      run "puts Bundler.settings[:foo] == nil"
+      expect(out).to eq("true")
+    end
+
+    it "warns when overriding" do
+      bundle "config --global foo previous"
+      bundle "config --global foo global"
+      expect(out).to match(/You are replacing the current global value of foo/)
+
+      run "puts Bundler.settings[:foo]"
+      expect(out).to eq("global")
+    end
+
+    it "does not warn when using the same value twice" do
+      bundle "config --global foo value"
+      bundle "config --global foo value"
+      expect(out).not_to match(/You are replacing the current global value of foo/)
+
+      run "puts Bundler.settings[:foo]"
+      expect(out).to eq("value")
+    end
+
+    it "expands the path at time of setting" do
+      bundle "config --global local.foo .."
+      run "puts Bundler.settings['local.foo']"
+      expect(out).to eq(File.expand_path(Dir.pwd + "/.."))
+    end
+
+    it "saves with parseable option" do
+      bundle "config --global --parseable foo value"
+      expect(out).to eq("foo=value")
+      run "puts Bundler.settings['foo']"
+      expect(out).to eq("value")
+    end
+
+    context "when replacing a current value with the parseable flag" do
+      before { bundle "config --global foo value" }
+      it "prints the current value in a parseable format" do
+        bundle "config --global --parseable foo value2"
+        expect(out).to eq "foo=value2"
+        run "puts Bundler.settings['foo']"
+        expect(out).to eq("value2")
+      end
+    end
+  end
+
+  describe "local" do
+    before(:each) { bundle :install }
+
+    it "can also be set explicitly" do
+      bundle "config --local foo local"
+      run "puts Bundler.settings[:foo]"
+      expect(out).to eq("local")
+    end
+
+    it "has higher precedence than env" do
+      begin
+        ENV["BUNDLE_FOO"] = "env"
+        bundle "config --local foo local"
+
+        run "puts Bundler.settings[:foo]"
+        expect(out).to eq("local")
+      ensure
+        ENV.delete("BUNDLE_FOO")
+      end
+    end
+
+    it "can be deleted" do
+      bundle "config --local foo local"
+      bundle "config --delete foo"
+
+      run "puts Bundler.settings[:foo] == nil"
+      expect(out).to eq("true")
+    end
+
+    it "warns when overriding" do
+      bundle "config --local foo previous"
+      bundle "config --local foo local"
+      expect(out).to match(/You are replacing the current local value of foo/)
+
+      run "puts Bundler.settings[:foo]"
+      expect(out).to eq("local")
+    end
+
+    it "expands the path at time of setting" do
+      bundle "config --local local.foo .."
+      run "puts Bundler.settings['local.foo']"
+      expect(out).to eq(File.expand_path(Dir.pwd + "/.."))
+    end
+
+    it "can be deleted with parseable option" do
+      bundle "config --local foo value"
+      bundle "config --delete --parseable foo"
+      expect(out).to eq ""
+      run "puts Bundler.settings['foo'] == nil"
+      expect(out).to eq("true")
+    end
+  end
+
+  describe "env" do
+    before(:each) { bundle :install }
+
+    it "can set boolean properties via the environment" do
+      ENV["BUNDLE_FROZEN"] = "true"
+
+      run "if Bundler.settings[:frozen]; puts 'true' else puts 'false' end"
+      expect(out).to eq("true")
+    end
+
+    it "can set negative boolean properties via the environment" do
+      run "if Bundler.settings[:frozen]; puts 'true' else puts 'false' end"
+      expect(out).to eq("false")
+
+      ENV["BUNDLE_FROZEN"] = "false"
+
+      run "if Bundler.settings[:frozen]; puts 'true' else puts 'false' end"
+      expect(out).to eq("false")
+
+      ENV["BUNDLE_FROZEN"] = "0"
+
+      run "if Bundler.settings[:frozen]; puts 'true' else puts 'false' end"
+      expect(out).to eq("false")
+
+      ENV["BUNDLE_FROZEN"] = ""
+
+      run "if Bundler.settings[:frozen]; puts 'true' else puts 'false' end"
+      expect(out).to eq("false")
+    end
+
+    it "can set properties with periods via the environment" do
+      ENV["BUNDLE_FOO__BAR"] = "baz"
+
+      run "puts Bundler.settings['foo.bar']"
+      expect(out).to eq("baz")
+    end
+  end
+
+  describe "parseable option" do
+    it "prints an empty string" do
+      bundle "config foo --parseable"
+
+      expect(out).to eq ""
+    end
+
+    it "only prints the value of the config" do
+      bundle "config foo local"
+      bundle "config foo --parseable"
+
+      expect(out).to eq "foo=local"
+    end
+
+    it "can print global config" do
+      bundle "config --global bar value"
+      bundle "config bar --parseable"
+
+      expect(out).to eq "bar=value"
+    end
+
+    it "preferes local config over global" do
+      bundle "config --local bar value2"
+      bundle "config --global bar value"
+      bundle "config bar --parseable"
+
+      expect(out).to eq "bar=value2"
+    end
+  end
+
+  describe "gem mirrors" do
+    before(:each) { bundle :install }
+
+    it "configures mirrors using keys with `mirror.`" do
+      bundle "config --local mirror.http://gems.example.org http://gem-mirror.example.org"
+      run(<<-E)
+Bundler.settings.gem_mirrors.each do |k, v|
+  puts "\#{k} => \#{v}"
+end
+E
+      expect(out).to eq("http://gems.example.org/ => http://gem-mirror.example.org/")
+    end
+  end
+
+  describe "quoting" do
+    before(:each) { gemfile "# no gems" }
+    let(:long_string) do
+      "--with-xml2-include=/usr/pkg/include/libxml2 --with-xml2-lib=/usr/pkg/lib " \
+      "--with-xslt-dir=/usr/pkg"
+    end
+
+    it "saves quotes" do
+      bundle "config foo something\\'"
+      run "puts Bundler.settings[:foo]"
+      expect(out).to eq("something'")
+    end
+
+    it "doesn't return quotes around values", :ruby => "1.9" do
+      bundle "config foo '1'"
+      run "puts Bundler.settings.send(:global_config_file).read"
+      expect(out).to include('"1"')
+      run "puts Bundler.settings[:foo]"
+      expect(out).to eq("1")
+    end
+
+    it "doesn't duplicate quotes around values", :if => (RUBY_VERSION >= "2.1") do
+      bundled_app(".bundle").mkpath
+      File.open(bundled_app(".bundle/config"), "w") do |f|
+        f.write 'BUNDLE_FOO: "$BUILD_DIR"'
+      end
+
+      bundle "config bar baz"
+      run "puts Bundler.settings.send(:local_config_file).read"
+
+      # Starting in Ruby 2.1, YAML automatically adds double quotes
+      # around some values, including $ and newlines.
+      expect(out).to include('BUNDLE_FOO: "$BUILD_DIR"')
+    end
+
+    it "doesn't duplicate quotes around long wrapped values" do
+      bundle "config foo #{long_string}"
+
+      run "puts Bundler.settings[:foo]"
+      expect(out).to eq(long_string)
+
+      bundle "config bar baz"
+
+      run "puts Bundler.settings[:foo]"
+      expect(out).to eq(long_string)
+    end
+  end
+
+  describe "very long lines" do
+    before(:each) { bundle :install }
+
+    let(:long_string) do
+      "--with-xml2-include=/usr/pkg/include/libxml2 --with-xml2-lib=/usr/pkg/lib " \
+      "--with-xslt-dir=/usr/pkg"
+    end
+
+    let(:long_string_without_special_characters) do
+      "here is quite a long string that will wrap to a second line but will not be " \
+      "surrounded by quotes"
+    end
+
+    it "doesn't wrap values" do
+      bundle "config foo #{long_string}"
+      run "puts Bundler.settings[:foo]"
+      expect(out).to match(long_string)
+    end
+
+    it "can read wrapped unquoted values" do
+      bundle "config foo #{long_string_without_special_characters}"
+      run "puts Bundler.settings[:foo]"
+      expect(out).to match(long_string_without_special_characters)
+    end
+  end
+end
+
+RSpec.describe "setting gemfile via config" do
+  context "when only the non-default Gemfile exists" do
+    it "persists the gemfile location to .bundle/config" do
+      File.open(bundled_app("NotGemfile"), "w") do |f|
+        f.write <<-G
+          source "file://#{gem_repo1}"
+          gem 'rack'
+        G
+      end
+
+      bundle "config --local gemfile #{bundled_app("NotGemfile")}"
+      expect(File.exist?(".bundle/config")).to eq(true)
+
+      bundle "config"
+      expect(out).to include("NotGemfile")
+    end
+  end
+end