diff --git a/packages/schematics/angular/refactor/jasmine-vitest/transformers/jasmine-lifecycle.ts b/packages/schematics/angular/refactor/jasmine-vitest/transformers/jasmine-lifecycle.ts
index 78ddd1e99316..eb58a7f9d5b9 100644
--- a/packages/schematics/angular/refactor/jasmine-vitest/transformers/jasmine-lifecycle.ts
+++ b/packages/schematics/angular/refactor/jasmine-vitest/transformers/jasmine-lifecycle.ts
@@ -15,7 +15,7 @@
 
 import ts from 'typescript';
 import { createPropertyAccess } from '../utils/ast-helpers';
-import { addTodoComment } from '../utils/comment-helpers';
+import { addCommentedNodeText, addTodoComment } from '../utils/comment-helpers';
 import { RefactorContext } from '../utils/refactor-context';
 
 const FOCUSED_SKIPPED_RENAMES = new Map<string, { newBase: string; newName: string }>([
@@ -77,7 +77,6 @@ export function transformPending(
     ) {
       hasPending = true;
       const replacement = ts.factory.createEmptyStatement();
-      const originalText = bodyNode.getFullText().trim();
 
       reporter.reportTransformation(
         sourceFile,
@@ -87,12 +86,7 @@ export function transformPending(
       const category = 'pending';
       reporter.recordTodo(category, sourceFile, bodyNode);
       addTodoComment(replacement, category);
-      ts.addSyntheticLeadingComment(
-        replacement,
-        ts.SyntaxKind.SingleLineCommentTrivia,
-        ` ${originalText}`,
-        true,
-      );
+      addCommentedNodeText(replacement, bodyNode);
 
       return replacement;
     }
diff --git a/packages/schematics/angular/refactor/jasmine-vitest/transformers/jasmine-matcher.ts b/packages/schematics/angular/refactor/jasmine-vitest/transformers/jasmine-matcher.ts
index c1e669b144ef..1e0a87dc80f2 100644
--- a/packages/schematics/angular/refactor/jasmine-vitest/transformers/jasmine-matcher.ts
+++ b/packages/schematics/angular/refactor/jasmine-vitest/transformers/jasmine-matcher.ts
@@ -21,7 +21,7 @@ import {
   createPropertyAccess,
 } from '../utils/ast-helpers';
 import { getJasmineMethodName, isJasmineCallExpression } from '../utils/ast-validation';
-import { addTodoComment } from '../utils/comment-helpers';
+import { addCommentedNodeText, addTodoComment } from '../utils/comment-helpers';
 import { RefactorContext } from '../utils/refactor-context';
 
 const SUGAR_MATCHER_CHANGES = new Map<string, { newName: string; newArgs?: ts.Expression[] }>([
@@ -607,18 +607,12 @@ export function transformExpectNothing(
 
   // The statement is `expect().nothing()`, which can be removed.
   const replacement = ts.factory.createEmptyStatement();
-  const originalText = node.getFullText().trim();
 
   reporter.reportTransformation(sourceFile, node, 'Removed `expect().nothing()` statement.');
   const category = 'expect-nothing';
   reporter.recordTodo(category, sourceFile, node);
   addTodoComment(replacement, category);
-  ts.addSyntheticLeadingComment(
-    replacement,
-    ts.SyntaxKind.SingleLineCommentTrivia,
-    ` ${originalText}`,
-    true,
-  );
+  addCommentedNodeText(replacement, node);
 
   return replacement;
 }
diff --git a/packages/schematics/angular/refactor/jasmine-vitest/transformers/jasmine-misc.ts b/packages/schematics/angular/refactor/jasmine-vitest/transformers/jasmine-misc.ts
index 6832e36b9273..f71353cc9783 100644
--- a/packages/schematics/angular/refactor/jasmine-vitest/transformers/jasmine-misc.ts
+++ b/packages/schematics/angular/refactor/jasmine-vitest/transformers/jasmine-misc.ts
@@ -16,7 +16,7 @@
 import ts from 'typescript';
 import { addVitestValueImport } from '../utils/ast-helpers';
 import { getJasmineMethodName, isJasmineCallExpression } from '../utils/ast-validation';
-import { addTodoComment } from '../utils/comment-helpers';
+import { addCommentedNodeText, addTodoComment } from '../utils/comment-helpers';
 import { RefactorContext } from '../utils/refactor-context';
 import { createViCallExpression } from '../utils/refactor-helpers';
 import { TodoCategory } from '../utils/todo-notes';
@@ -143,7 +143,6 @@ export function transformJasmineMembers(node: ts.Node, refactorCtx: RefactorCont
         case 'MAX_PRETTY_PRINT_DEPTH':
         case 'MAX_PRETTY_PRINT_CHARS': {
           const replacement = ts.factory.createEmptyStatement();
-          const originalText = node.getFullText().trim();
 
           reporter.reportTransformation(
             sourceFile,
@@ -153,12 +152,7 @@ export function transformJasmineMembers(node: ts.Node, refactorCtx: RefactorCont
           const category = 'unsupported-jasmine-member';
           reporter.recordTodo(category, sourceFile, node);
           addTodoComment(replacement, category, { name: memberName });
-          ts.addSyntheticLeadingComment(
-            replacement,
-            ts.SyntaxKind.SingleLineCommentTrivia,
-            ` ${originalText}`,
-            true,
-          );
+          addCommentedNodeText(replacement, node);
 
           return replacement;
         }
diff --git a/packages/schematics/angular/refactor/jasmine-vitest/utils/comment-helpers.ts b/packages/schematics/angular/refactor/jasmine-vitest/utils/comment-helpers.ts
index 2ece945e2951..02a9255deb3a 100644
--- a/packages/schematics/angular/refactor/jasmine-vitest/utils/comment-helpers.ts
+++ b/packages/schematics/angular/refactor/jasmine-vitest/utils/comment-helpers.ts
@@ -70,3 +70,23 @@ export function addTodoComment(
     true,
   );
 }
+
+/**
+ * Safely comments out the full text of a node line-by-line and attaches
+ * it to a target node. This prevents multi-line statements from breaking
+ * syntax when converted to single-line comments.
+ * @param targetNode The node to which the comments will be added.
+ * @param nodeToComment The original node whose text will be commented out.
+ */
+export function addCommentedNodeText(targetNode: ts.Node, nodeToComment: ts.Node): void {
+  const originalText = nodeToComment.getFullText().trim();
+  const lines = originalText.split('\n');
+  for (const line of lines) {
+    ts.addSyntheticLeadingComment(
+      targetNode,
+      ts.SyntaxKind.SingleLineCommentTrivia,
+      ` ${line.trim()}`,
+      true,
+    );
+  }
+}
diff --git a/packages/schematics/angular/refactor/jasmine-vitest/utils/comment-helpers_spec.ts b/packages/schematics/angular/refactor/jasmine-vitest/utils/comment-helpers_spec.ts
index ddfb1b8b7ad1..4f44b2664368 100644
--- a/packages/schematics/angular/refactor/jasmine-vitest/utils/comment-helpers_spec.ts
+++ b/packages/schematics/angular/refactor/jasmine-vitest/utils/comment-helpers_spec.ts
@@ -7,7 +7,7 @@
  */
 
 import ts from 'typescript';
-import { addTodoComment } from './comment-helpers';
+import { addCommentedNodeText, addTodoComment } from './comment-helpers';
 
 describe('addTodoComment', () => {
   function createTestHarness(sourceText: string) {
@@ -65,4 +65,19 @@ describe('addTodoComment', () => {
     expect(result.trim().startsWith('// TODO')).toBe(true);
     expect(result).toContain('const mySpy = jasmine.createSpy()');
   });
+
+  describe('addCommentedNodeText', () => {
+    it('should comment out a multiline node line-by-line', () => {
+      const sourceText = `expect()\n  .nothing();`;
+      const sourceFile = ts.createSourceFile('test.ts', sourceText, ts.ScriptTarget.Latest, true);
+      const statement = sourceFile.statements[0];
+      const replacement = ts.factory.createEmptyStatement();
+      const printer = ts.createPrinter({ newLine: ts.NewLineKind.LineFeed });
+
+      addCommentedNodeText(replacement, statement);
+
+      const result = printer.printNode(ts.EmitHint.Unspecified, replacement, sourceFile);
+      expect(result).toContain('// expect()\n// .nothing();');
+    });
+  });
 });