diff --git a/packages/eslint-plugin/tests/rules/prefer-readonly.test.ts b/packages/eslint-plugin/tests/rules/prefer-readonly.test.ts
index a8d170c4a7d0..39262c6fbb4e 100644
--- a/packages/eslint-plugin/tests/rules/prefer-readonly.test.ts
+++ b/packages/eslint-plugin/tests/rules/prefer-readonly.test.ts
@@ -654,7 +654,7 @@ class Foo {
     `
       class TestIntersection {
         private prop: number = 3;
-      
+
         test() {
           const that = {} as this & { _foo: 'bar' };
           that.prop = 1;
@@ -664,7 +664,7 @@ class Foo {
     `
       class TestUnion {
         private prop: number = 3;
-      
+
         test() {
           const that = {} as this | (this & { _foo: 'bar' });
           that.prop = 1;
@@ -674,7 +674,7 @@ class Foo {
     `
       class TestStaticIntersection {
         private static prop: number;
-      
+
         test() {
           const that = {} as typeof TestStaticIntersection & { _foo: 'bar' };
           that.prop = 1;
@@ -684,7 +684,7 @@ class Foo {
     `
       class TestStaticUnion {
         private static prop: number = 1;
-      
+
         test() {
           const that = {} as
             | typeof TestStaticUnion
@@ -697,7 +697,7 @@ class Foo {
       class TestBothIntersection {
         private prop1: number = 1;
         private static prop2: number;
-      
+
         test() {
           const that = {} as typeof TestBothIntersection & this;
           that.prop1 = 1;
@@ -709,7 +709,7 @@ class Foo {
       class TestBothIntersection {
         private prop1: number = 1;
         private static prop2: number;
-      
+
         test() {
           const that = {} as this & typeof TestBothIntersection;
           that.prop1 = 1;
@@ -2048,7 +2048,7 @@ function ClassWithName<TBase extends new (...args: any[]) => {}>(Base: TBase) {
       code: `
         class Test {
           private prop: number = 3;
-        
+
           test() {
             const that = {} as this & { _foo: 'bar' };
             that._foo = 1;
@@ -2057,11 +2057,11 @@ function ClassWithName<TBase extends new (...args: any[]) => {}>(Base: TBase) {
       `,
       output: `
         class Test {
-          private readonly prop: number = 3
+          private readonly prop: number = 3;
 
           test() {
-            const that = {} as this & {_foo: 'bar'}
-            that._foo = 1
+            const that = {} as this & { _foo: 'bar' };
+            that._foo = 1;
           }
         }
       `,
@@ -2079,7 +2079,7 @@ function ClassWithName<TBase extends new (...args: any[]) => {}>(Base: TBase) {
       code: `
         class Test {
           private prop: number = 3;
-        
+
           test() {
             const that = {} as this | (this & { _foo: 'bar' });
             that.prop;
@@ -2088,11 +2088,11 @@ function ClassWithName<TBase extends new (...args: any[]) => {}>(Base: TBase) {
       `,
       output: `
         class Test {
-          private readonly prop: number = 3
+          private readonly prop: number = 3;
 
           test() {
-            const that = {} as this | (this & {_foo: 'bar'})
-            that.prop
+            const that = {} as this | (this & { _foo: 'bar' });
+            that.prop;
           }
         }
       `,
@@ -2110,7 +2110,7 @@ function ClassWithName<TBase extends new (...args: any[]) => {}>(Base: TBase) {
       code: `
         class Test {
           private prop: number;
-        
+
           constructor() {
             const that = {} as this & { _foo: 'bar' };
             that.prop = 1;
@@ -2119,11 +2119,11 @@ function ClassWithName<TBase extends new (...args: any[]) => {}>(Base: TBase) {
       `,
       output: `
         class Test {
-          private readonly prop: number
+          private readonly prop: number;
 
           constructor() {
-            const that = {} as this & {_foo: 'bar'}
-            that.prop = 1
+            const that = {} as this & { _foo: 'bar' };
+            that.prop = 1;
           }
         }
       `,