diff --git a/src/rules/file/hasDoxygenHeader.spec.ts b/src/rules/file/hasDoxygenHeader.spec.ts
index 02d0ca4..e29c59c 100644
--- a/src/rules/file/hasDoxygenHeader.spec.ts
+++ b/src/rules/file/hasDoxygenHeader.spec.ts
@@ -59,7 +59,7 @@ describe('hasDoxygenHeader - test', () => {
   it('should return an array with a single diagnostic when the file is undefined', () => {
     const content = undefined
 
-    expect(hasDoxygenHeader.test((content as unknown) as string)).toEqual([
+    expect(hasDoxygenHeader.test(content as unknown as string)).toEqual([
       {
         message: 'File missing Doxygen header',
         lineNumber: 1,
diff --git a/src/rules/file/hasMacroNameInMend.spec.ts b/src/rules/file/hasMacroNameInMend.spec.ts
index 6daf1bf..5693a2e 100644
--- a/src/rules/file/hasMacroNameInMend.spec.ts
+++ b/src/rules/file/hasMacroNameInMend.spec.ts
@@ -114,7 +114,7 @@ describe('hasMacroNameInMend - test', () => {
   it('should return an empty array when the file is undefined', () => {
     const content = undefined
 
-    expect(hasMacroNameInMend.test((content as unknown) as string)).toEqual([])
+    expect(hasMacroNameInMend.test(content as unknown as string)).toEqual([])
   })
 
   describe('nestedMacros', () => {
diff --git a/src/rules/file/hasMacroParentheses.spec.ts b/src/rules/file/hasMacroParentheses.spec.ts
index cc2d706..1fa58bc 100644
--- a/src/rules/file/hasMacroParentheses.spec.ts
+++ b/src/rules/file/hasMacroParentheses.spec.ts
@@ -79,7 +79,7 @@ describe('hasMacroParentheses', () => {
   it('should return an empty array when the file is undefined', () => {
     const content = undefined
 
-    expect(hasMacroParentheses.test((content as unknown) as string)).toEqual([])
+    expect(hasMacroParentheses.test(content as unknown as string)).toEqual([])
   })
 
   describe('with extra spaces and comments', () => {
diff --git a/src/rules/file/noNestedMacros.spec.ts b/src/rules/file/noNestedMacros.spec.ts
index 1daccc4..937a86e 100644
--- a/src/rules/file/noNestedMacros.spec.ts
+++ b/src/rules/file/noNestedMacros.spec.ts
@@ -72,7 +72,7 @@ describe('noNestedMacros', () => {
   it('should return an empty array when the file is undefined', () => {
     const content = undefined
 
-    expect(noNestedMacros.test((content as unknown) as string)).toEqual([])
+    expect(noNestedMacros.test(content as unknown as string)).toEqual([])
   })
 
   it('should use the configured line ending while testing content', () => {