Add spec for API catalogue

spec/lib/api_catalogue_spec.rb

@@ -0,0 +1,30 @@
+require "api_catalogue"
+
+RSpec.describe ApiCatalogue, "::from_csv" do
+  let(:csv_path) { File.expand_path("../../data/inputs/apic.csv", __dir__) }
+
+  it "parses the CSV source" do
+    api_catalogue = described_class.from_csv(csv_path)
+
+    expect(api_catalogue.organisations_apis.size).to be > 10
+
+    gds, gds_apis = api_catalogue.organisations_apis.detect do |org, _|
+      org.name.casecmp?("Government Digital Service")
+    end
+
+    notify_api = gds_apis.detect do |api|
+      api.name.casecmp?("GOV.UK Notify")
+    end
+
+    expect(gds).to have_attributes(
+      name: "Government Digital Service",
+      alternate_name: "GDS",
+    )
+
+    expect(notify_api).to have_attributes(
+      name: "GOV.UK Notify",
+      description: be_present,
+      url: "https://api.notifications.service.gov.uk/",
+    )
+  end
+end