1 files changed, 66 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..6ab7e25cc3
--- /dev/null
+++ b/spec/bundler/commands/init_spec.rb
@@ -0,0 +1,66 @@
+# frozen_string_literal: true
+require "spec_helper"
+
+RSpec.describe "bundle init" do
+  it "generates a Gemfile" do
+    bundle :init
+    expect(bundled_app("Gemfile")).to exist
+  end
+
+  context "when a Gemfile already exists" do
+    before do
+      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 "given --gemspec option" 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 = bundled_app("Gemfile").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
+
+    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(out).to include("There was an error while loading `test.gemspec`")
+      end
+    end
+  end
+end