diff --git a/lib/kangaru/initialisers/rspec.rb b/lib/kangaru/initialisers/rspec.rb
new file mode 100644
index 0000000..68c9341
--- /dev/null
+++ b/lib/kangaru/initialisers/rspec.rb
@@ -0,0 +1,11 @@
+module Kangaru
+  module Initialisers
+    module RSpec
+      if Object.const_defined?(:RSpec)
+        ::RSpec.configure do
+          Kangaru.env = :test
+        end
+      end
+    end
+  end
+end
diff --git a/sig/kangaru/initialisers.rbs b/sig/kangaru/initialisers.rbs
deleted file mode 100644
index 76e016e..0000000
--- a/sig/kangaru/initialisers.rbs
+++ /dev/null
@@ -1,4 +0,0 @@
-module Kangaru
-  module Initialisers
-  end
-end
diff --git a/lib/kangaru/initialisers.rb b/sig/kangaru/initialisers/rspec.rbs
similarity index 65%
rename from lib/kangaru/initialisers.rb
rename to sig/kangaru/initialisers/rspec.rbs
index 76e016e..36aca68 100644
--- a/lib/kangaru/initialisers.rb
+++ b/sig/kangaru/initialisers/rspec.rbs
@@ -1,4 +1,6 @@
 module Kangaru
   module Initialisers
+    module RSpec
+    end
   end
 end
diff --git a/spec/features/initialiser_spec.rb b/spec/features/initialiser_spec.rb
index 05c441d..1ed4727 100644
--- a/spec/features/initialiser_spec.rb
+++ b/spec/features/initialiser_spec.rb
@@ -10,88 +10,114 @@ class Foobar
     RUBY
   end
 
-  context "when the target gem does not extend the initialiser" do
-    before do
-      gem.main_file.write(<<~RUBY)
-        require "kangaru"
+  describe "initialising application" do
+    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
 
-        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 "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 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
 
-    it "does not set the Kangaru application reference" do
-      expect { require_gem }.not_to change { Kangaru.application }.from(nil)
+      it "does not define the run! method in the gem's root module" do
+        require_gem
+        expect(SomeGem).not_to respond_to(:run!)
+      end
     end
 
-    it "does not define the run! method in the gem's root module" do
-      require_gem
-      expect(SomeGem).not_to respond_to(:run!)
-    end
-  end
+    context "when the target gem extends the initialiser" do
+      before do
+        gem.main_file.write(<<~RUBY)
+          require "kangaru"
 
-  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
 
-        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 "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 "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
 
-    it "sets the Kangaru application reference" do
-      expect { require_gem }
-        .to change { Kangaru.application }
-        .from(nil)
-        .to(a_kind_of(Kangaru::Application))
-    end
+      it "defines the run! method in the gem's root module" do
+        require_gem
+        expect(SomeGem).to respond_to(:run!)
+      end
 
-    it "defines the run! method in the gem's root module" do
-      require_gem
-      expect(SomeGem).to respond_to(:run!)
-    end
+      describe "application reference" do
+        subject(:application) { Kangaru.application }
 
-    describe "application reference" do
-      subject(:application) { Kangaru.application }
+        before { require_gem }
 
-      before { require_gem }
+        it "sets the application source to the gem main file" do
+          expect(application.paths.source).to eq(gem.main_file)
+        end
 
-      it "sets the application source to the gem main file" do
-        expect(application.paths.source).to eq(gem.main_file)
+        it "sets the application name to the expected value" do
+          expect(application.paths.name).to eq("some_gem")
+        end
       end
+    end
+  end
 
-      it "sets the application name to the expected value" do
-        expect(application.paths.name).to eq("some_gem")
-      end
+  describe "setting test environment in RSpec" do
+    subject(:run_test) { gem.exec("rspec #{test_file}") }
+
+    let(:test_file) { gem.spec_path("test_spec") }
+
+    before do
+      gem.spec_path.mkdir unless gem.spec_path.exist?
+
+      test_file.write(<<~RUBY)
+        RSpec.describe do
+          it "sets the test environment" do
+            expect(Kangaru).to be_test
+          end
+        end
+      RUBY
+    end
+
+    include_context :kangaru_initialised
+
+    it "configures Kangaru to the test environment" do
+      expect(run_test).not_to include("FAILED")
     end
   end
 end