diff --git a/download.spec.ts b/download.spec.ts
index 3002cfa..c0e55db 100644
--- a/download.spec.ts
+++ b/download.spec.ts
@@ -154,6 +154,7 @@ describe('download', () => {
         })
 
         it('should fetch the zip and create the dest folder', async () => {
+            mapVersionsMock.mockReturnValue([new MappedVersion(10, 0, 0, 1, false)])
             getChromeDownloadUrlMock.mockResolvedValue(createGetChromeDownloadUrlReturn())
 
             fetchChromeZipFileMock.mockResolvedValue(zipFileResource)
@@ -181,6 +182,36 @@ describe('download', () => {
     
             expect(fetchChromeZipFileMock).toHaveBeenCalledTimes(1)
             expect(fetchChromeZipFileMock).toHaveBeenCalledWith('chromeUrl')
+
+            expect(getChromeDownloadUrlMock).toHaveBeenCalledTimes(1)
+            expect(getChromeDownloadUrlMock).toHaveBeenCalledWith({
+                arch: 'x64',
+                autoUnzip: false,
+                download: true,
+                downloadFolder: 'down_folder',
+                hideNegativeHits: false,
+                interactive: true,
+                inverse: false,
+                max: new ComparableVersion({
+                    major: 10000,
+                    minor: 0,
+                    branch: 0,
+                    patch: 0,
+                }),
+                min: new ComparableVersion({
+                    branch: 0,
+                    major: 0,
+                    minor: 0,
+                    patch: 0,
+                }),
+                onFail: 'nothing',
+                onlyNewestMajor: false,
+                os: 'linux',
+                quiet: false,
+                results: 10,
+                single: null,
+                store: true,
+            }, [new MappedVersion(10, 0, 0, 1, false)])
         })
 
         it('should fetch the zip and create the dest folder on finish', async () => {
@@ -243,7 +274,8 @@ describe('download', () => {
             expect(fetchChromeZipFileMock).toHaveBeenCalledWith('chromeUrl')
         })
 
-        it.only('should fetch the zip with defaults', async () => {
+        it('should fetch the zip with defaults', async () => {
+            mapVersionsMock.mockReturnValue([new MappedVersion(10, 0, 0, 2, false)])
             getChromeDownloadUrlMock.mockResolvedValue(createGetChromeDownloadUrlReturn())
 
             fetchChromeZipFileMock.mockResolvedValue(zipFileResource)
@@ -259,10 +291,57 @@ describe('download', () => {
 
             expect(fetchChromeZipFileMock).toHaveBeenCalledTimes(1)
             expect(fetchChromeZipFileMock).toHaveBeenCalledWith('chromeUrl')
+
+            expect(getChromeDownloadUrlMock).toHaveBeenCalledTimes(1)
+            expect(getChromeDownloadUrlMock).toHaveBeenCalledWith({
+                arch: 'x64',
+                autoUnzip: false,
+                download: true,
+                downloadFolder: null,
+                hideNegativeHits: false,
+                interactive: true,
+                inverse: false,
+                max: new ComparableVersion({
+                    major: 10000,
+                    minor: 0,
+                    branch: 0,
+                    patch: 0,
+                }),
+                min: new ComparableVersion({
+                    branch: 0,
+                    major: 0,
+                    minor: 0,
+                    patch: 0,
+                }),
+                onFail: 'nothing',
+                onlyNewestMajor: false,
+                os: 'linux',
+                quiet: false,
+                results: 10,
+                single: null,
+                store: true,
+            }, [new MappedVersion(10, 0, 0, 2, false)])
+            
         })
 
-        it.skip('should', () => {
-            //
+        it('should fetch the zip with defaults for single', async () => {
+            getChromeDownloadUrlMock.mockResolvedValue(createGetChromeDownloadUrlReturn())
+
+            fetchChromeZipFileMock.mockResolvedValue(zipFileResource)
+
+            // Act
+            await downloadChromium.withDefaults({
+                single: new ComparableVersion(10, 0, 0, 0),
+            })
+
+            expect(progressConstructorMock).toHaveBeenCalledTimes(1)
+            expect(progressConstructorMock).toHaveBeenCalledWith(zipFileResource, { throttle: 100 })
+
+            expect(progressMock.start).toHaveBeenCalledTimes(0)
+            expect(progressMock.fraction).toHaveBeenCalledTimes(0)
+
+            expect(fetchChromeZipFileMock).toHaveBeenCalledTimes(1)
+            expect(fetchChromeZipFileMock).toHaveBeenCalledWith('chromeUrl')
         })
 
         it('should fetch and exract the zip', async () => {
diff --git a/download.ts b/download.ts
index 326c528..973afa9 100644
--- a/download.ts
+++ b/download.ts
@@ -44,11 +44,13 @@ function registerSigIntHandler(path: string): void {
 
 function enrichAdditionalConfig(additionalConfig: Partial<IChromeConfig> = {}): IChromeConfig {
     if (isChromeSingleConfig(additionalConfig)) {
+        console.log('single config')
         return {
             ...DEFAULT_SINGLE_CONFIG,
             ...additionalConfig,
         }
     } else {
+        console.log('full config')
         return {
             ...DEFAULT_FULL_CONFIG,
             ...additionalConfig,
diff --git a/utils/typeguards.spec.ts b/utils/typeguards.spec.ts
index 348ccdb..cd42fd8 100644
--- a/utils/typeguards.spec.ts
+++ b/utils/typeguards.spec.ts
@@ -4,7 +4,8 @@
  * @group unit/utils/typeguard
  */
 
-import { isTextFunction, isIVersion, isIVersionWithDisabled } from './typeguards'
+import { ComparableVersion } from '../commons/ComparableVersion'
+import { isTextFunction, isIVersion, isIVersionWithDisabled, isChromeSingleConfig } from './typeguards'
 
 describe('typeguards', () => {
 
@@ -140,4 +141,25 @@ describe('typeguards', () => {
             })).toBe(false)
         })
     })
+
+    describe('isChromeSingleConfig', () => {
+        it('should correctly identify an IChromeSingleConfig', () => {
+            expect(isChromeSingleConfig({
+                single: new ComparableVersion(1,2,3,4),
+            })).toBe(true)
+        })
+
+        it('should return false on single === null', () => {
+            expect(isChromeSingleConfig({
+                hideNegativeHits: true,
+                single: null,
+            })).toBe(false)
+        })
+
+        it('should return false on single === undefined', () => {
+            expect(isChromeSingleConfig({
+                inverse: false,
+            })).toBe(false)
+        })
+    })
 })
diff --git a/utils/typeguards.ts b/utils/typeguards.ts
index ed566fc..4fbc480 100644
--- a/utils/typeguards.ts
+++ b/utils/typeguards.ts
@@ -16,5 +16,5 @@ export function isIVersionWithDisabled(value: unknown): value is IVersionWithDis
 }
 
 export function isChromeSingleConfig(value: Partial<IChromeConfig>): value is Partial<IChromeSingleConfig> {
-    return value.single !== null
+    return value.single !== null && value.single !== undefined
 }