1 files changed, 181 insertions, 0 deletions
diff --git a/spec/bundler/commands/init_spec.rb b/spec/bundler/commands/init_spec.rb
new file mode 100644
index 0000000000..9b5bd95814
--- /dev/null
+++ b/spec/bundler/commands/init_spec.rb
@@ -0,0 +1,181 @@
+# frozen_string_literal: true
+
+RSpec.describe "bundle init" do
+  it "generates a Gemfile", :bundler => "< 2" do
+    bundle! :init
+    expect(out).to include("Writing new Gemfile")
+    expect(bundled_app("Gemfile")).to be_file
+  end
+
+  it "generates a gems.rb", :bundler => "2" do
+    bundle! :init
+    expect(out).to include("Writing new gems.rb")
+    expect(bundled_app("gems.rb")).to be_file
+  end
+
+  context "when a Gemfile already exists", :bundler => "< 2" do
+    before do
+      create_file "Gemfile", <<-G
+        gem "rails"
+      G
+    end
+
+    it "does not change existing Gemfiles" do
+      expect { bundle :init }.not_to change { File.read(bundled_app("Gemfile")) }
+    end
+
+    it "notifies the user that an existing Gemfile already exists" do
+      bundle :init
+      expect(out).to include("Gemfile already exists")
+    end
+  end
+
+  context "when gems.rb already exists", :bundler => ">= 2" do
+    before do
+      create_file("gems.rb", <<-G)
+        gem "rails"
+      G
+    end
+
+    it "does not change existing Gemfiles" do
+      expect { bundle :init }.not_to change { File.read(bundled_app("gems.rb")) }
+    end
+
+    it "notifies the user that an existing gems.rb already exists" do
+      bundle :init
+      expect(out).to include("gems.rb already exists")
+    end
+  end
+
+  context "when a Gemfile exists in a parent directory", :bundler => "< 2" do
+    let(:subdir) { "child_dir" }
+
+    it "lets users generate a Gemfile in a child directory" do
+      bundle! :init
+
+      FileUtils.mkdir bundled_app(subdir)
+
+      Dir.chdir bundled_app(subdir) do
+        bundle! :init
+      end
+
+      expect(out).to include("Writing new Gemfile")
+      expect(bundled_app("#{subdir}/Gemfile")).to be_file
+    end
+  end
+
+  context "when the dir is not writable by the current user" do
+    let(:subdir) { "child_dir" }
+
+    it "notifies the user that it can not write to it" do
+      FileUtils.mkdir bundled_app(subdir)
+      # chmod a-w it
+      mode = File.stat(bundled_app(subdir)).mode ^ 0o222
+      FileUtils.chmod mode, bundled_app(subdir)
+
+      Dir.chdir bundled_app(subdir) do
+        bundle :init
+      end
+
+      expect(out).to include("directory is not writable")
+      expect(Dir[bundled_app("#{subdir}/*")]).to be_empty
+    end
+  end
+
+  context "when a gems.rb file exists in a parent directory", :bundler => ">= 2" do
+    let(:subdir) { "child_dir" }
+
+    it "lets users generate a Gemfile in a child directory" do
+      bundle! :init
+
+      FileUtils.mkdir bundled_app(subdir)
+
+      Dir.chdir bundled_app(subdir) do
+        bundle! :init
+      end
+
+      expect(out).to include("Writing new gems.rb")
+      expect(bundled_app("#{subdir}/gems.rb")).to be_file
+    end
+  end
+
+  context "given --gemspec option", :bundler => "< 2" do
+    let(:spec_file) { tmp.join("test.gemspec") }
+
+    it "should generate from an existing gemspec" do
+      File.open(spec_file, "w") do |file|
+        file << <<-S
+          Gem::Specification.new do |s|
+          s.name = 'test'
+          s.add_dependency 'rack', '= 1.0.1'
+          s.add_development_dependency 'rspec', '1.2'
+          end
+        S
+      end
+
+      bundle :init, :gemspec => spec_file
+
+      gemfile = if Bundler::VERSION[0, 2] == "1."
+        bundled_app("Gemfile").read
+      else
+        bundled_app("gems.rb").read
+      end
+      expect(gemfile).to match(%r{source 'https://rubygems.org'})
+      expect(gemfile.scan(/gem "rack", "= 1.0.1"/).size).to eq(1)
+      expect(gemfile.scan(/gem "rspec", "= 1.2"/).size).to eq(1)
+      expect(gemfile.scan(/group :development/).size).to eq(1)
+    end
+
+    context "when gemspec file is invalid" do
+      it "notifies the user that specification is invalid" do
+        File.open(spec_file, "w") do |file|
+          file << <<-S
+            Gem::Specification.new do |s|
+            s.name = 'test'
+            s.invalid_method_name
+            end
+          S
+        end
+
+        bundle :init, :gemspec => spec_file
+        expect(last_command.bundler_err).to include("There was an error while loading `test.gemspec`")
+      end
+    end
+  end
+
+  context "when init_gems_rb setting is enabled" do
+    before { bundle "config init_gems_rb true" }
+
+    context "given --gemspec option", :bundler => "< 2" do
+      let(:spec_file) { tmp.join("test.gemspec") }
+
+      before do
+        File.open(spec_file, "w") do |file|
+          file << <<-S
+            Gem::Specification.new do |s|
+            s.name = 'test'
+            s.add_dependency 'rack', '= 1.0.1'
+            s.add_development_dependency 'rspec', '1.2'
+            end
+          S
+        end
+      end
+
+      it "should generate from an existing gemspec" do
+        bundle :init, :gemspec => spec_file
+
+        gemfile = bundled_app("gems.rb").read
+        expect(gemfile).to match(%r{source 'https://rubygems.org'})
+        expect(gemfile.scan(/gem "rack", "= 1.0.1"/).size).to eq(1)
+        expect(gemfile.scan(/gem "rspec", "= 1.2"/).size).to eq(1)
+        expect(gemfile.scan(/group :development/).size).to eq(1)
+      end
+
+      it "prints message to user" do
+        bundle :init, :gemspec => spec_file
+
+        expect(out).to include("Writing new gems.rb")
+      end
+    end
+  end
+end