diff --git a/spec/support/shared.rb b/spec/support/shared.rb
index e69de29..84423ac 100644
--- a/spec/support/shared.rb
+++ b/spec/support/shared.rb
@@ -0,0 +1,52 @@
+RSpec.shared_context "default endpoint context" do
+  let(:bearer_token) { "Bearer token" }
+
+  let(:arguments) do
+    args = {}
+    args[:connected] = connected if defined?(connected)
+    args[:basic] = basic if defined?(basic)
+    args[:body] = body if defined?(body)
+    args.merge!(params) if defined?(params)
+    args.compact!
+
+    args
+  end
+
+  let(:scalingo_client) do
+    scalingo = Scalingo::Client.new
+    scalingo.authenticate_with(bearer_token: bearer_token) if bearer_token
+    scalingo
+  end
+
+  let(:api_path) { URI.parse("http://localhost") }
+
+  let(:api_client) { described_class.module_parent.new(api_path.to_s, scalingo: scalingo_client) }
+  let(:instance) { described_class.new(api_client) }
+
+  subject do
+    response # need to be defined in the including context
+    WebMock # returning this lets us use the one-liner `have_requested` syntax
+  end
+end
+
+RSpec.shared_examples "requires authentication" do
+  context "when the client is not authenticated" do
+    let(:bearer_token) { nil }
+
+    it "raises an exception" do
+      expect { subject }.to raise_error(Scalingo::Error::Unauthenticated)
+    end
+  end
+end
+
+RSpec.shared_examples "requires some params" do |*keys|
+  keys.each do |key|
+    context "when #{key} is missing" do
+      before { params.delete(key) }
+
+      it "raises an exception" do
+        expect { subject }.to raise_error(ArgumentError)
+      end
+    end
+  end
+end