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

tests/phase22/breadcrumb-route-maps-helper.test.cjs

@@ -63,6 +63,9 @@ test("buildBreadcrumbRendererMaps returns grouped maps in explicit precedence or
     const callbackRouteRenderersByPath = {
         "/theta": () => "theta"
     };
+    const stepBackRouteRenderersByPath = {
+        "/iota": () => "iota"
+    };
     const caseDetailRouteRenderersByPath = {
         "/delta": () => "delta"
     };
@@ -76,12 +79,13 @@ test("buildBreadcrumbRendererMaps returns grouped maps in explicit precedence or
         simpleMyPortalRouteRenderersByPath,
         newAppealRouteRenderersByPath,
         callbackRouteRenderersByPath,
+        stepBackRouteRenderersByPath,
         caseDetailRouteRenderersByPath,
         detailAndAccountRouteRenderersByPath
     });
 
     assert.ok(Array.isArray(result), "Expected grouped maps array");
-    assert.strictEqual(result.length, 7, "Expected seven grouped route maps");
+    assert.strictEqual(result.length, 8, "Expected eight grouped route maps");
     assert.strictEqual(
         result[0],
         simpleRouteRenderersByPath,
@@ -109,13 +113,18 @@ test("buildBreadcrumbRendererMaps returns grouped maps in explicit precedence or
     );
     assert.strictEqual(
         result[5],
-        caseDetailRouteRenderersByPath,
-        "Expected case detail route renderers sixth"
+        stepBackRouteRenderersByPath,
+        "Expected step-back route renderers sixth"
     );
     assert.strictEqual(
         result[6],
+        caseDetailRouteRenderersByPath,
+        "Expected case detail route renderers seventh"
+    );
+    assert.strictEqual(
+        result[7],
         detailAndAccountRouteRenderersByPath,
-        "Expected detail and account route renderers seventh"
+        "Expected detail and account route renderers eighth"
     );
 });
 
@@ -136,6 +145,7 @@ test("resolveMappedRouteRenderer returns renderer from first matching grouped ma
         simpleMyPortalRouteRenderersByPath: {},
         newAppealRouteRenderersByPath: {},
         callbackRouteRenderersByPath: {},
+        stepBackRouteRenderersByPath: {},
         caseDetailRouteRenderersByPath: {},
         detailAndAccountRouteRenderersByPath: {}
     });
@@ -164,6 +174,7 @@ test("resolveMappedRouteRenderer returns renderer from later grouped map when ea
         simpleMyPortalRouteRenderersByPath: {},
         caseDetailRouteRenderersByPath: {},
         callbackRouteRenderersByPath: {},
+        stepBackRouteRenderersByPath: {},
         detailAndAccountRouteRenderersByPath: {
             "/account/personaldetails": detailRenderer
         }
@@ -190,6 +201,7 @@ test("resolveMappedRouteRenderer returns null for unmapped path", () => {
         simpleMyPortalRouteRenderersByPath: {},
         newAppealRouteRenderersByPath: {},
         callbackRouteRenderersByPath: {},
+        stepBackRouteRenderersByPath: {},
         caseDetailRouteRenderersByPath: {},
         detailAndAccountRouteRenderersByPath: {}
     });
@@ -219,6 +231,7 @@ test("resolveMappedRouteRenderer skips invalid map entries and non-function rend
         },
         newAppealRouteRenderersByPath: undefined,
         callbackRouteRenderersByPath: {},
+        stepBackRouteRenderersByPath: {},
         caseDetailRouteRenderersByPath: {},
         detailAndAccountRouteRenderersByPath: {}
     });