diff --git a/__tests__/deny.test.ts b/__tests__/deny.test.ts
index e3cf026..e5888b9 100644
--- a/__tests__/deny.test.ts
+++ b/__tests__/deny.test.ts
@@ -1,11 +1,7 @@
 import {expect, jest, test} from '@jest/globals'
 import {Change, Changes} from '../src/schemas'
-import {
-  createMavenTestChange,
-  createPipTestChange,
-  createRubyTestChange,
-  createTestChange
-} from './fixtures/create-test-change'
+import {createTestChange} from './fixtures/create-test-change'
+import {getDeniedChanges} from '../src/deny'
 
 jest.mock('@actions/core')
 
@@ -19,7 +15,6 @@ const mockOctokit = {
   }
 }
 
-let getDeniedChanges: Function
 let npmChange: Change
 let rubyChange: Change
 let pipChange: Change
@@ -43,22 +38,18 @@ beforeEach(async () => {
     // true for BSD, false for all others
     return jest.fn((license: string, _: string): boolean => license === 'BSD')
   })
-  // eslint-disable-next-line @typescript-eslint/no-require-imports
-  ;({getDeniedChanges} = require('../src/deny'))
 
-  npmChange = createTestChange()
-  rubyChange = createRubyTestChange()
-  pipChange = createPipTestChange()
-  mvnChange = createMavenTestChange()
+  npmChange = createTestChange({ecosystem: 'npm'})
+  rubyChange = createTestChange({ecosystem: 'rubygems'})
+  pipChange = createTestChange({ecosystem: 'pip'})
+  mvnChange = createTestChange({ecosystem: 'maven'})
 })
 
 test('denies packages from the deny packages list', async () => {
   const changes: Changes = [npmChange, rubyChange]
-  const deniedChanges = await getDeniedChanges(
-    changes,
-    ['pkg:gem/actionsomething@3.2.0'],
-    []
-  )
+  const deniedChanges = await getDeniedChanges(changes, [
+    'pkg:gem/actionsomething@3.2.0'
+  ])
 
   expect(deniedChanges[0]).toBe(rubyChange)
   expect(deniedChanges.length).toEqual(1)
@@ -67,11 +58,9 @@ test('denies packages from the deny packages list', async () => {
 test('denies packages only for the specified version from deny packages list', async () => {
   const packageWithDifferentVersion = 'pkg:npm/lodash@1.2.3'
   const changes: Changes = [npmChange]
-  const deniedChanges = await getDeniedChanges(
-    changes,
-    [packageWithDifferentVersion],
-    []
-  )
+  const deniedChanges = await getDeniedChanges(changes, [
+    packageWithDifferentVersion
+  ])
 
   expect(deniedChanges.length).toEqual(0)
 })
@@ -83,11 +72,7 @@ test('if no specified version from deny packages list, it will treat package as
     createTestChange({name: 'lodash', version: '7.8.9'})
   ]
   const denyAllLodashVersions = 'pkg:npm/lodash'
-  const deniedChanges = await getDeniedChanges(
-    changes,
-    [denyAllLodashVersions],
-    []
-  )
+  const deniedChanges = await getDeniedChanges(changes, [denyAllLodashVersions])
 
   expect(deniedChanges.length).toEqual(3)
 })
diff --git a/__tests__/fixtures/create-test-change.ts b/__tests__/fixtures/create-test-change.ts
index 979c3e2..30d5653 100644
--- a/__tests__/fixtures/create-test-change.ts
+++ b/__tests__/fixtures/create-test-change.ts
@@ -101,29 +101,19 @@ const defaultMavenChange: Change = {
   ]
 }
 
-const createTestChange = (overwrites: Partial<Change> = {}): Change => ({
-  ...defaultNpmChange,
-  ...overwrites
-})
-
-const createRubyTestChange = (overwrites: Partial<Change> = {}): Change => ({
-  ...defaultRubyChange,
-  ...overwrites
-})
-
-const createPipTestChange = (overwrites: Partial<Change> = {}): Change => ({
-  ...defaultPipChange,
-  ...overwrites
-})
-
-const createMavenTestChange = (overwrites: Partial<Change> = {}): Change => ({
-  ...defaultMavenChange,
-  ...overwrites
-})
-
-export {
-  createTestChange,
-  createRubyTestChange,
-  createPipTestChange,
-  createMavenTestChange
+const ecosystemToDefaultChange: {[key: string]: Change} = {
+  npm: defaultNpmChange,
+  rubygems: defaultRubyChange,
+  pip: defaultPipChange,
+  maven: defaultMavenChange
 }
+
+const createTestChange = (overwrites: Partial<Change> = {}): Change => {
+  const ecosystem = overwrites.ecosystem || 'npm'
+  return {
+    ...ecosystemToDefaultChange[ecosystem],
+    ...overwrites
+  }
+}
+
+export {createTestChange}
diff --git a/src/deny.ts b/src/deny.ts
index 2614306..60c9bf3 100644
--- a/src/deny.ts
+++ b/src/deny.ts
@@ -3,21 +3,22 @@ import * as core from '@actions/core'
 
 export async function getDeniedChanges(
   changes: Change[],
-  deniedPackages: string[],
-  deniedGroups: string[]
+  deniedPackages: string[] = [],
+  deniedGroups: string[] = []
 ): Promise<Change[]> {
   const changesDenied: Change[] = []
 
   let hasDeniedPackage = false
   for (const change of changes) {
-    change.name = change.name.toLowerCase()
-    const [name, version] = change.package_url.toLowerCase().split('@')
+    const [packageName, packageVersion] = change.package_url
+      .toLowerCase()
+      .split('@')
 
     for (const denied of deniedPackages) {
       const [deniedName, deniedVersion] = denied.toLowerCase().split('@')
       if (
-        (!deniedVersion || version === deniedVersion) &&
-        name === deniedName
+        (!deniedVersion || packageVersion === deniedVersion) &&
+        packageName === deniedName
       ) {
         changesDenied.push(change)
         hasDeniedPackage = true
@@ -25,7 +26,7 @@ export async function getDeniedChanges(
     }
 
     for (const denied of deniedGroups) {
-      if (name.startsWith(denied.toLowerCase())) {
+      if (packageName.startsWith(denied.toLowerCase())) {
         changesDenied.push(change)
         hasDeniedPackage = true
       }