diff --git a/src/__tests__/unit/lib/co2js/index.test.ts b/src/__tests__/unit/lib/co2js/index.test.ts
index 9d3333a..143c64e 100644
--- a/src/__tests__/unit/lib/co2js/index.test.ts
+++ b/src/__tests__/unit/lib/co2js/index.test.ts
@@ -4,55 +4,25 @@ import {Co2jsModel} from '../../../../lib/co2js';
 jest.setTimeout(30000);
 
 describe('co2js-test', () => {
-  test('initialize and test', async () => {
-    const model = await new Co2jsModel().configure({
-      type: '1byte',
-    });
-    expect(model).toBeInstanceOf(Co2jsModel);
+  test('initialization tests', async () => {
+    const outputModel = new Co2jsModel();
     await expect(
-      model.execute([
-        {
-          timestamp: '2021-01-01T00:00:00Z',
-          duration: 3600,
-          bytes: 100000,
-          'green-web-host': true,
-        },
-      ])
-    ).resolves.toStrictEqual([
-      {
-        timestamp: '2021-01-01T00:00:00Z',
-        duration: 3600,
-        bytes: 100000,
-        'green-web-host': true,
-        'operational-carbon': 0.023195833333333332,
-      },
-    ]);
-  });
-  test('initialize and test', async () => {
-    const model = await new Co2jsModel().configure({
-      type: '1byte',
-    });
-    expect(model).toBeInstanceOf(Co2jsModel);
+      outputModel.configure({
+        type: '1byte',
+      })
+    ).resolves.toBeInstanceOf(Co2jsModel);
     await expect(
-      model.execute([
-        {
-          timestamp: '2021-01-01T00:00:00Z',
-          duration: 3600,
-          bytes: 100000,
-          'green-web-host': true,
-        },
-      ])
-    ).resolves.toStrictEqual([
-      {
-        timestamp: '2021-01-01T00:00:00Z',
-        duration: 3600,
-        bytes: 100000,
-        'green-web-host': true,
-        'operational-carbon': 0.023195833333333332,
-      },
-    ]);
+      outputModel.configure({
+        type: 'swd',
+      })
+    ).resolves.toBeInstanceOf(Co2jsModel);
+    await expect(
+      outputModel.configure({
+        type: '1byt',
+      })
+    ).rejects.toThrow();
   });
-  test('initialize and test', async () => {
+  test('initialize and test 1byte', async () => {
     const model = await new Co2jsModel().configure({
       type: '1byte',
     });
@@ -76,9 +46,9 @@ describe('co2js-test', () => {
       },
     ]);
   });
-  test('initialize and test', async () => {
+  test('initialize and test swd', async () => {
     const model = await new Co2jsModel().configure({
-      type: '1byte',
+      type: 'swd',
     });
     expect(model).toBeInstanceOf(Co2jsModel);
     await expect(
@@ -96,11 +66,11 @@ describe('co2js-test', () => {
         duration: 3600,
         bytes: 100000,
         'green-web-host': true,
-        'operational-carbon': 0.023195833333333332,
+        'operational-carbon': 0.023209515022500005,
       },
     ]);
   });
-  test('initialize and test', async () => {
+  test('initialize and test without bytes input', async () => {
     const model = await new Co2jsModel().configure({
       type: '1byte',
     });
@@ -110,18 +80,9 @@ describe('co2js-test', () => {
         {
           timestamp: '2021-01-01T00:00:00Z',
           duration: 3600,
-          bytes: 100000,
           'green-web-host': true,
         },
       ])
-    ).resolves.toStrictEqual([
-      {
-        timestamp: '2021-01-01T00:00:00Z',
-        duration: 3600,
-        bytes: 100000,
-        'green-web-host': true,
-        'operational-carbon': 0.023195833333333332,
-      },
-    ]);
+    ).rejects.toThrow();
   });
 });
diff --git a/src/lib/co2js/index.ts b/src/lib/co2js/index.ts
index bdb6164..8eaccd5 100644
--- a/src/lib/co2js/index.ts
+++ b/src/lib/co2js/index.ts
@@ -9,10 +9,6 @@ export class Co2jsModel implements ModelPluginInterface {
   time: string | unknown;
   model: any | undefined;
 
-  authenticate(authParams: object): void {
-    this.authParams = authParams;
-  }
-
   async execute(observations: ModelParams[]): Promise<ModelParams[]> {
     return observations.map((observation: any) => {
       this.configure(observation);