add tests

app/models/journeys/navigator.rb

@@ -9,24 +9,6 @@ def initialize(current_slug:, slug_sequence:, params:, session:)
       @session = session
     end
 
-    def slug_to_load
-      return "ineligible" if eligibility_checker.ineligible?
-
-      slug_sequence.slugs.each do |slug|
-        form_class = journey.form_class_for_slug(slug:)
-        form = form_class.new(
-          journey:,
-          journey_session:,
-          params: {},
-          session:
-        )
-
-        if form.invalid?
-          return slug
-        end
-      end
-    end
-
     def previous_slug
       last_valid_slug = nil
 
@@ -61,7 +43,7 @@ def next_slug
         form = form_class.new(
           journey:,
           journey_session:,
-          params: ActionController::Parameters.new,
+          params:,
           session:
         )
         form.skip_tree_walking_validation!
@@ -90,12 +72,6 @@ def next_slug
       end
     end
 
-    def previous?
-    end
-
-    def next?
-    end
-
     private
 
     def journey

spec/models/journeys/navigator_spec.rb

@@ -0,0 +1,85 @@
+require "rails_helper"
+
+RSpec.describe Journeys::Navigator do
+  subject { described_class.new(current_slug:, slug_sequence:, params:, session:) }
+
+  let(:current_slug) { "teaching-responsibilities" }
+  let(:slug_sequence) { Journeys::FurtherEducationPayments::SlugSequence.new(journey_session) }
+  let(:params) { ActionController::Parameters.new }
+  let(:session) { {} }
+  let(:journey_session) do
+    create(:further_education_payments_session, answers: answers)
+  end
+
+  describe "#next_slug" do
+    context "when should be first slug" do
+      let(:answers) do
+        build(
+          :further_education_payments_answers
+        )
+      end
+
+      it "returns first slug" do
+        expect(subject.next_slug).to eql("teaching-responsibilities")
+      end
+    end
+
+    context "when should be second slug" do
+      let(:current_slug) { "teaching-responsibilities" }
+      let(:params) do
+        ActionController::Parameters.new(claim: {
+          teaching_responsibilities: "true"
+        })
+      end
+
+      let(:answers) do
+        build(
+          :further_education_payments_answers,
+        )
+      end
+
+      it "returns second slug" do
+        expect(subject.next_slug).to eql("further-education-provision-search")
+      end
+    end
+
+    context "when should be third slug" do
+      let(:current_slug) { "further-education-provision-search" }
+      let(:params) do
+        ActionController::Parameters.new(claim: {
+          provision_search: "ply"
+        })
+      end
+
+      let(:answers) do
+        build(
+          :further_education_payments_answers,
+          teaching_responsibilities: true
+        )
+      end
+
+      before do
+        create(:school, name: "Plymouth")
+      end
+
+      it "returns third slug" do
+        expect(subject.next_slug).to eql("select-provision")
+      end
+    end
+
+    context "when should be ineligible" do
+      let(:current_slug) { "teaching-responsibilities" }
+
+      let(:answers) do
+        build(
+          :further_education_payments_answers,
+          teaching_responsibilities: false
+        )
+      end
+
+      it "returns ineligible" do
+        expect(subject.next_slug).to eql("ineligible")
+      end
+    end
+  end
+end