Add specs for ExperimentStorage

Author: andrehjr

spec/experiment_storage_spec.rb

@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+
+describe Split::ExperimentStorage do
+  let(:experiment) do
+    {
+      resettable: "false",
+      algorithm: "Split::Algorithms::WeightedSample",
+      alternatives: [ "foo", "bar" ],
+      goals: ["purchase", "refund"],
+      metadata: {
+        "foo" => { "text" => "Something bad" },
+        "bar" => { "text" => "Something good" }
+      }
+    }
+  end
+  before do
+    Split.configuration.experiments = {
+      my_exp: experiment
+    }
+  end
+
+  context "ConfigStorage" do
+    let(:config_store) { Split::ExperimentStorage::ConfigStorage.new("my_exp") }
+
+    it "loads an experiment from the configuration" do
+      stored_data = config_store.load
+      expect(stored_data).to match(experiment)
+    end
+
+    it "checks if an experiment exists on the configuration" do
+      expect(config_store.exists?).to be_truthy
+      expect(Split::ExperimentStorage::ConfigStorage.new("whatever").exists?).to be_falsy
+    end
+
+    it "memoizes data from the configuration by default" do
+      expect(config_store).to receive(:load!).once.and_call_original
+      config_store.load
+      config_store.load
+    end
+  end
+
+  context "from Redis" do
+    before { Split::ExperimentCatalog.find_or_create(:my_exp) }
+    let(:config_store) { Split::ExperimentStorage::RedisStorage.new("my_exp") }
+
+    it "loads an experiment from the configuration" do
+      stored_data = config_store.load
+      stored_data[:alternatives].map! { |alternative| alternative.name }
+      expect(stored_data).to match(experiment)
+    end
+
+    it "checks if an experiment exists on the configuration" do
+      expect(config_store.exists?).to be_truthy
+      expect(Split::ExperimentStorage::ConfigStorage.new("whatever").exists?).to be_falsy
+    end
+  end
+end