refactor(breadcrumbs): map step-back route branches into renderer group

lib/routing/breadcrumbRendererFactories.js

@@ -167,6 +167,42 @@ export const createCallbackRouteRenderers = ({
     )
 });
 
+export const createStepBackRouteRenderers = ({
+    t,
+    currentSection,
+    onStepBack,
+    onStepBackWithInlineClass,
+    renderLinkCrumb,
+    renderBackCrumb
+}) => ({
+    "/newappeal/[appealtypes]": () => {
+        if (currentSection <= 1) {
+            return null;
+        }
+
+        if (currentSection === 9999) {
+            return renderLinkCrumb("/", t("common:service-name-breadcrumb"));
+        }
+
+        return renderBackCrumb(
+            onStepBackWithInlineClass,
+            "govuk-breadcrumbs__link-item"
+        );
+    },
+
+    "/myportal/[appealtypes]": () => {
+        if (currentSection <= 1) {
+            return null;
+        }
+
+        if (currentSection === 9999) {
+            return renderLinkCrumb("/", t("common:service-name-breadcrumb"));
+        }
+
+        return renderBackCrumb(onStepBack);
+    }
+});
+
 export const createCaseDetailRouteRenderers = ({
     t,
     router,
@@ -418,13 +454,17 @@ export const createMappedRouteRendererGroups = ({
     nestedSearchString,
     caseReferenceDisplay,
     onBack,
+    currentSection,
+    onStepBack,
+    onStepBackWithInlineClass,
     renderAnchorCrumb,
     renderLinkCrumb,
     renderTextCrumb,
     renderCaseReferenceCrumb,
     renderMyPortalCrumb,
     renderMyPortalSectionCrumbs,
-    renderDnsCaseReferenceCrumbs
+    renderDnsCaseReferenceCrumbs,
+    renderBackCrumb
 }) => {
     const simpleRouteRenderersByPath = createSimpleRouteRenderers({
         t,
@@ -476,6 +516,15 @@ export const createMappedRouteRendererGroups = ({
         onBack
     });
 
+    const stepBackRouteRenderersByPath = createStepBackRouteRenderers({
+        t,
+        currentSection,
+        onStepBack,
+        onStepBackWithInlineClass,
+        renderLinkCrumb,
+        renderBackCrumb
+    });
+
     const caseDetailRouteRenderersByPath = createCaseDetailRouteRenderers({
         t,
         router,
@@ -512,6 +561,7 @@ export const createMappedRouteRendererGroups = ({
         simpleMyPortalRouteRenderersByPath,
         newAppealRouteRenderersByPath,
         callbackRouteRenderersByPath,
+        stepBackRouteRenderersByPath,
         caseDetailRouteRenderersByPath,
         detailAndAccountRouteRenderersByPath
     };

lib/routing/breadcrumbRouteMaps.js

@@ -24,6 +24,7 @@ const buildBreadcrumbRendererMaps = ({
     simpleMyPortalRouteRenderersByPath,
     newAppealRouteRenderersByPath,
     callbackRouteRenderersByPath,
+    stepBackRouteRenderersByPath,
     caseDetailRouteRenderersByPath,
     detailAndAccountRouteRenderersByPath
 }) => [
@@ -32,6 +33,7 @@ const buildBreadcrumbRendererMaps = ({
     simpleMyPortalRouteRenderersByPath,
     newAppealRouteRenderersByPath,
     callbackRouteRenderersByPath,
+    stepBackRouteRenderersByPath,
     caseDetailRouteRenderersByPath,
     detailAndAccountRouteRenderersByPath
 ];