added spec for paginatable concern

spec/concerns/paginatable_spec.rb

@@ -0,0 +1,51 @@
+
+require "rails_helper"
+
+describe "Dois", type: :controller do
+  subject { DoisController.new }
+
+  it "no params" do
+    params = ActionController::Parameters.new
+    expect(subject.page_from_params(params)).to eq(:number=>1, :size=>25)
+  end
+
+  it "page as string" do
+    params = ActionController::Parameters.new({ page: "3" })
+    expect(subject.page_from_params(params)).to eq(:number=>1, :size=>25)
+  end
+
+  it "page number" do
+    params = ActionController::Parameters.new({ page: { number: "3" }})
+    expect(subject.page_from_params(params)).to eq(:number=>3, :size=>25)
+  end
+
+  it "page number too high" do
+    params = ActionController::Parameters.new({ page: { number: "401" }})
+    expect(subject.page_from_params(params)).to eq(:number=>400, :size=>25)
+  end
+
+  it "page size" do
+    params = ActionController::Parameters.new({ page: { size: "250" }})
+    expect(subject.page_from_params(params)).to eq(:number=>1, :size=>250)
+  end
+
+  it "page size too high" do
+    params = ActionController::Parameters.new({ page: { size: "1001" }})
+    expect(subject.page_from_params(params)).to eq(:number=>1, :size=>1000)
+  end
+
+  it "page cursor" do
+    params = ActionController::Parameters.new({ page: { cursor: "MTMwMjUyMTAxNjAwMCwxMC40MTIyLzEuMTAwMDAwMDAyMg" }})
+    expect(subject.page_from_params(params)).to eq(cursor: ["1302521016000", "10.4122/1.1000000022"], number: 1, size: 25)
+  end
+
+  it "page invalid cursor" do
+    params = ActionController::Parameters.new({ page: { cursor: "A" }})
+    expect(subject.page_from_params(params)).to eq(cursor: [], number: 1, size: 25)
+  end
+
+  it "page empty cursor" do
+    params = ActionController::Parameters.new({ page: { cursor: nil }})
+    expect(subject.page_from_params(params)).to eq(cursor: [], number: 1, size: 25)
+  end
+end