From 655ded65a0cdf44437fd824939f9592ace4013c9 Mon Sep 17 00:00:00 2001
From: Chris Welham <71787007+apexatoll@users.noreply.github.com>
Date: Sun, 24 Sep 2023 17:57:34 +0100
Subject: [PATCH] Create initialiser integration test

---
 spec/features/initialiser_spec.rb | 87 +++++++++++++++++++++++++++++++
 spec/kangaru/testing/gem_spec.rb  |  4 ++
 2 files changed, 91 insertions(+)
 create mode 100644 spec/features/initialiser_spec.rb

diff --git a/spec/features/initialiser_spec.rb b/spec/features/initialiser_spec.rb
new file mode 100644
index 0000000..352641b
--- /dev/null
+++ b/spec/features/initialiser_spec.rb
@@ -0,0 +1,87 @@
+RSpec.describe "Initialising Kangaru in a target gem", :with_gem do
+  subject(:require_gem) { gem.load! }
+
+  before do
+    gem.gem_file("foobar").write(<<~RUBY)
+      module SomeGem
+        class Foobar
+        end
+      end
+    RUBY
+  end
+
+  context "when the target gem does not extend the initialiser" do
+    before do
+      gem.main_file.write(<<~RUBY)
+        require "kangaru"
+
+        module SomeGem
+        end
+      RUBY
+    end
+
+    it "loads the gem module" do
+      expect { require_gem }
+        .to change { Object.const_defined?(:SomeGem) }
+        .from(false)
+        .to(true)
+    end
+
+    it "does not autoload gem files" do
+      expect { require_gem }
+        .not_to change { Object.const_defined?("SomeGem::Foobar") }
+        .from(false)
+    end
+
+    it "does not set the Kangaru application reference" do
+      expect { require_gem }.not_to change { Kangaru.application }.from(nil)
+    end
+  end
+
+  context "when the target gem extends the initialiser" do
+    before do
+      gem.main_file.write(<<~RUBY)
+        require "kangaru"
+
+        module SomeGem
+          extend Kangaru::Initialiser
+        end
+      RUBY
+    end
+
+    it "loads the gem module" do
+      expect { require_gem }
+        .to change { Object.const_defined?("SomeGem") }
+        .from(false)
+        .to(true)
+    end
+
+    it "autoloads gem files" do
+      expect { require_gem }
+        .to change { Object.const_defined?("SomeGem::Foobar") }
+        .from(false)
+        .to(true)
+    end
+
+    it "sets the Kangaru application reference" do
+      expect { require_gem }
+        .to change { Kangaru.application }
+        .from(nil)
+        .to(a_kind_of(Kangaru::Application))
+    end
+
+    describe "application reference" do
+      subject(:application) { Kangaru.application }
+
+      before { require_gem }
+
+      it "sets the application root dir to the gem lib path" do
+        expect(application.root_dir).to eq(gem.lib_path)
+      end
+
+      it "sets the application root file to the main gem file" do
+        expect(application.root_file).to eq(gem.main_file)
+      end
+    end
+  end
+end
diff --git a/spec/kangaru/testing/gem_spec.rb b/spec/kangaru/testing/gem_spec.rb
index 9bfcb14..31ab414 100644
--- a/spec/kangaru/testing/gem_spec.rb
+++ b/spec/kangaru/testing/gem_spec.rb
@@ -79,6 +79,10 @@
   describe "#load!" do
     subject(:load!) { gem.load! }
 
+    after do
+      Object.send(:remove_const, :SomeGem) if Object.const_defined?(:SomeGem)
+    end
+
     context "when gem has not been created" do
       it "raises an error" do
         expect { load! }.to raise_error(