diff --git a/packages/router-generator/src/generator.ts b/packages/router-generator/src/generator.ts
index d91e561a1..f282381db 100644
--- a/packages/router-generator/src/generator.ts
+++ b/packages/router-generator/src/generator.ts
@@ -5,6 +5,7 @@ import * as prettier from 'prettier'
 import {
   determineInitialRoutePath,
   logging,
+  multiSortBy,
   removeExt,
   removeTrailingSlash,
   removeUnderscores,
@@ -671,36 +672,6 @@ function spaces(d: number): string {
     .join('')
 }
 
-export function multiSortBy<T>(
-  arr: Array<T>,
-  accessors: Array<(item: T) => any> = [(d) => d],
-): Array<T> {
-  return arr
-    .map((d, i) => [d, i] as const)
-    .sort(([a, ai], [b, bi]) => {
-      for (const accessor of accessors) {
-        const ao = accessor(a)
-        const bo = accessor(b)
-
-        if (typeof ao === 'undefined') {
-          if (typeof bo === 'undefined') {
-            continue
-          }
-          return 1
-        }
-
-        if (ao === bo) {
-          continue
-        }
-
-        return ao > bo ? 1 : -1
-      }
-
-      return ai - bi
-    })
-    .map(([d]) => d)
-}
-
 function removeTrailingUnderscores(s?: string) {
   return s?.replaceAll(/(_$)/gi, '').replaceAll(/(_\/)/gi, '/')
 }
diff --git a/packages/router-generator/src/utils.ts b/packages/router-generator/src/utils.ts
index ffcac863f..201341f77 100644
--- a/packages/router-generator/src/utils.ts
+++ b/packages/router-generator/src/utils.ts
@@ -1,3 +1,33 @@
+export function multiSortBy<T>(
+  arr: Array<T>,
+  accessors: Array<(item: T) => any> = [(d) => d],
+): Array<T> {
+  return arr
+    .map((d, i) => [d, i] as const)
+    .sort(([a, ai], [b, bi]) => {
+      for (const accessor of accessors) {
+        const ao = accessor(a)
+        const bo = accessor(b)
+
+        if (typeof ao === 'undefined') {
+          if (typeof bo === 'undefined') {
+            continue
+          }
+          return 1
+        }
+
+        if (ao === bo) {
+          continue
+        }
+
+        return ao > bo ? 1 : -1
+      }
+
+      return ai - bi
+    })
+    .map(([d]) => d)
+}
+
 export function cleanPath(path: string) {
   // remove double slashes
   return path.replace(/\/{2,}/g, '/')
diff --git a/packages/router-generator/tests/utils.test.ts b/packages/router-generator/tests/utils.test.ts
new file mode 100644
index 000000000..22cb05f20
--- /dev/null
+++ b/packages/router-generator/tests/utils.test.ts
@@ -0,0 +1,125 @@
+import { describe, expect, it } from 'vitest'
+import {
+  cleanPath,
+  determineInitialRoutePath,
+  multiSortBy,
+  removeExt,
+  removeUnderscores,
+  routePathToVariable,
+} from '../src/utils'
+
+describe('cleanPath', () => {
+  it('keeps path with leading slash and trailing slash', () => {
+    expect(cleanPath('/test/')).toBe('/test/')
+  })
+})
+
+describe('determineInitialRoutePath', () => {
+  it('removes dots and adds slashes', () => {
+    expect(determineInitialRoutePath('test.test')).toBe('/test/test')
+  })
+
+  it('keeps leading slash', () => {
+    expect(determineInitialRoutePath('/test.test')).toBe('/test/test')
+  })
+
+  it('keeps trailing slash', () => {
+    expect(determineInitialRoutePath('test.test/')).toBe('/test/test/')
+  })
+
+  it('removes dots and adds slashes with leading and trailing slashes', () => {
+    expect(determineInitialRoutePath('/test.test/')).toBe('/test/test/')
+  })
+
+  it("returns '/' if path is empty", () => {
+    expect(determineInitialRoutePath('')).toBe('/')
+  })
+
+  it("returns '/' if path is '.'", () => {
+    expect(determineInitialRoutePath('.')).toBe('/')
+  })
+
+  it("returns '/' if path is './'", () => {
+    expect(determineInitialRoutePath('./')).toBe('/')
+  })
+})
+
+describe('multiSortBy', () => {
+  it('sorts by multiple criteria', () => {
+    const data = [
+      { routePath: '/test/1/2/index', f: 'b' },
+      { routePath: '/test/1', f: 'b' },
+      { routePath: '/test/1/2/3/4/index', f: 'b' },
+      { routePath: '/test/1/2/3', f: 'b' },
+      { routePath: '/test/1/2/3/index', f: 'b' },
+      { routePath: '/test/1/2', f: 'b' },
+      { routePath: '/test/1/2/3/4', f: 'b' },
+    ]
+
+    const sorted = multiSortBy(data, [
+      (d) => (d.routePath.includes('1') ? -1 : 1),
+      (d) => d.routePath.split('/').length,
+      (d) => (d.routePath.endsWith('index') ? -1 : 1),
+      (d) => d,
+    ])
+
+    expect(sorted).toEqual([
+      { routePath: '/test/1', f: 'b' },
+      { routePath: '/test/1/2', f: 'b' },
+      { routePath: '/test/1/2/index', f: 'b' },
+      { routePath: '/test/1/2/3', f: 'b' },
+      { routePath: '/test/1/2/3/index', f: 'b' },
+      { routePath: '/test/1/2/3/4', f: 'b' },
+      { routePath: '/test/1/2/3/4/index', f: 'b' },
+    ])
+  })
+})
+
+describe('removeExt', () => {
+  it('removes extension', () => {
+    expect(removeExt('test.ts')).toBe('test')
+  })
+
+  it('does not remove extension if no extension', () => {
+    expect(removeExt('test')).toBe('test')
+  })
+
+  it('removes extension with multiple dots', () => {
+    expect(removeExt('test.test.ts')).toBe('test.test')
+  })
+
+  it('removes extension with leading dot', () => {
+    expect(removeExt('.test.ts')).toBe('.test')
+  })
+
+  it('removes extension when in a route path', () => {
+    expect(removeExt('/test/test.ts')).toBe('/test/test')
+  })
+})
+
+describe('removeUnderscores', () => {
+  it('removes leading underscore', () => {
+    expect(removeUnderscores('_test')).toBe('test')
+  })
+
+  it('removes trailing underscore', () => {
+    expect(removeUnderscores('test_')).toBe('test')
+  })
+
+  it('removes leading and trailing underscores', () => {
+    expect(removeUnderscores('_test_')).toBe('test')
+  })
+})
+
+describe('routePathToVariable', () => {
+  it.each([
+    ['/test/$/index', 'TestSplatIndex'],
+    ['/test/$', 'TestSplat'],
+    ['/test/$/', 'TestSplat'],
+    ['/test/index', 'TestIndex'],
+    ['/test', 'Test'],
+    ['/test/', 'Test'],
+  ])(`converts "%s" to "%s"`, (routePath, expected) => {
+    expect(routePathToVariable(routePath)).toBe(expected)
+  })
+})