diff --git a/src/chromium/converters/tests/html.converter.test.ts b/src/chromium/converters/tests/html.converter.test.ts
index b4ff065c..53075ea5 100644
--- a/src/chromium/converters/tests/html.converter.test.ts
+++ b/src/chromium/converters/tests/html.converter.test.ts
@@ -1,4 +1,5 @@
-import { promises, createReadStream } from "fs";
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+import { createReadStream, promises } from "fs";
 
 import fetch from "node-fetch";
 import FormData from "form-data";
@@ -51,7 +52,7 @@ describe("HtmlConverter", () => {
           html: "path/to/index.html",
           pdfFormat: PdfFormat.A_1a,
         });
-        expect(mockFormDataAppend).toBeCalledTimes(2);
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(2);
         expect(buffer).toEqual(Buffer.from("content"));
       });
     });
@@ -64,7 +65,49 @@ describe("HtmlConverter", () => {
           html: "path/to/index.html",
           properties: { size: { width: 8.3, height: 11.7 } },
         });
-        expect(mockFormDataAppend).toBeCalledTimes(3);
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(3);
+        expect(buffer).toEqual(Buffer.from("content"));
+      });
+    });
+
+    describe("when header parameter is passed", () => {
+      it("should return a buffer", async () => {
+        mockPromisesAccess.mockResolvedValue();
+        mockFetch.mockResolvedValue(new Response("content"));
+        const buffer = await converter.convert({
+          html: "path/to/index.html",
+          header: "path/to/header.html",
+        });
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(2);
+        expect(buffer).toEqual(Buffer.from("content"));
+      });
+    });
+
+    describe("when footer parameter is passed", () => {
+      it("should return a buffer", async () => {
+        mockPromisesAccess.mockResolvedValue();
+        mockFetch.mockResolvedValue(new Response("content"));
+        const buffer = await converter.convert({
+          html: "path/to/index.html",
+          footer: "path/to/footer.html",
+        });
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(2);
+        expect(buffer).toEqual(Buffer.from("content"));
+      });
+    });
+
+    describe("when all parameters are passed", () => {
+      it("should return a buffer", async () => {
+        mockPromisesAccess.mockResolvedValue();
+        mockFetch.mockResolvedValue(new Response("content"));
+        const buffer = await converter.convert({
+          html: "path/to/index.html",
+          header: "path/to/header.html",
+          footer: "path/to/footer.html",
+          pdfFormat: PdfFormat.A_1a,
+          properties: { size: { width: 8.3, height: 11.7 } },
+        });
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(6);
         expect(buffer).toEqual(Buffer.from("content"));
       });
     });
diff --git a/src/chromium/converters/tests/markdown.converter.test.ts b/src/chromium/converters/tests/markdown.converter.test.ts
index 1d343d70..0bdf10e3 100644
--- a/src/chromium/converters/tests/markdown.converter.test.ts
+++ b/src/chromium/converters/tests/markdown.converter.test.ts
@@ -1,5 +1,7 @@
-import FormData from "form-data";
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
 import { createReadStream, promises } from "fs";
+
+import FormData from "form-data";
 import fetch from "node-fetch";
 
 import { PdfFormat } from "../../../common";
@@ -54,7 +56,7 @@ describe("MarkdownConverter", () => {
           markdown: "path/to/file.md",
           pdfFormat: PdfFormat.A_2b,
         });
-        expect(mockFormDataAppend).toBeCalledTimes(3);
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(3);
         expect(buffer).toEqual(Buffer.from("content"));
       });
     });
@@ -68,7 +70,52 @@ describe("MarkdownConverter", () => {
           markdown: "path/to/file.md",
           properties: { size: { width: 8.3, height: 11.7 } },
         });
-        expect(mockFormDataAppend).toBeCalledTimes(4);
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(4);
+        expect(buffer).toEqual(Buffer.from("content"));
+      });
+    });
+
+    describe("when header parameter is passed", () => {
+      it("should return a buffer", async () => {
+        mockPromisesAccess.mockResolvedValue();
+        mockFetch.mockResolvedValue(new Response("content"));
+        const buffer = await converter.convert({
+          html: "path/to/index.html",
+          markdown: "path/to/file.md",
+          header: "path/to/header.html",
+        });
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(3);
+        expect(buffer).toEqual(Buffer.from("content"));
+      });
+    });
+
+    describe("when footer parameter is passed", () => {
+      it("should return a buffer", async () => {
+        mockPromisesAccess.mockResolvedValue();
+        mockFetch.mockResolvedValue(new Response("content"));
+        const buffer = await converter.convert({
+          html: "path/to/index.html",
+          markdown: "path/to/file.md",
+          footer: "path/to/footer.html",
+        });
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(3);
+        expect(buffer).toEqual(Buffer.from("content"));
+      });
+    });
+
+    describe("when all parameters are passed", () => {
+      it("should return a buffer", async () => {
+        mockPromisesAccess.mockResolvedValue();
+        mockFetch.mockResolvedValue(new Response("content"));
+        const buffer = await converter.convert({
+          html: "path/to/index.html",
+          markdown: "path/to/file.md",
+          header: "path/to/header.html",
+          footer: "path/to/footer.html",
+          pdfFormat: PdfFormat.A_1a,
+          properties: { size: { width: 8.3, height: 11.7 } },
+        });
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(7);
         expect(buffer).toEqual(Buffer.from("content"));
       });
     });
diff --git a/src/chromium/converters/tests/url.converter.test.ts b/src/chromium/converters/tests/url.converter.test.ts
index d5c75f76..a21315ee 100644
--- a/src/chromium/converters/tests/url.converter.test.ts
+++ b/src/chromium/converters/tests/url.converter.test.ts
@@ -1,3 +1,5 @@
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+import { createReadStream, promises } from "fs";
 import FormData from "form-data";
 import fetch from "node-fetch";
 
@@ -10,9 +12,16 @@ jest.mock("node-fetch", () => jest.fn());
 describe("HtmlConverter", () => {
   const mockFetch = fetch as jest.MockedFunction<typeof fetch>;
   const mockFormDataAppend = jest.spyOn(FormData.prototype, "append");
+  const mockPromisesAccess = jest.spyOn(promises, "access");
 
   const converter = new UrlConverter();
 
+  beforeEach(() => {
+    (createReadStream as jest.Mock) = jest
+      .fn()
+      .mockImplementation((file) => file);
+  });
+
   afterEach(() => {
     jest.resetAllMocks();
   });
@@ -36,6 +45,34 @@ describe("HtmlConverter", () => {
       });
     });
 
+    describe("when header parameter is passed", () => {
+      it("should return a buffer", async () => {
+        mockFetch.mockResolvedValueOnce(new Response("content"));
+        mockPromisesAccess.mockResolvedValue();
+        mockFetch.mockResolvedValue(new Response("content"));
+        const buffer = await converter.convert({
+          url: "http://www.example.com/",
+          header: "path/to/header.html",
+        });
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(2);
+        expect(buffer).toEqual(Buffer.from("content"));
+      });
+    });
+
+    describe("when footer parameter is passed", () => {
+      it("should return a buffer", async () => {
+        mockFetch.mockResolvedValueOnce(new Response("content"));
+        mockPromisesAccess.mockResolvedValue();
+        mockFetch.mockResolvedValue(new Response("content"));
+        const buffer = await converter.convert({
+          url: "http://www.example.com/",
+          footer: "path/to/footer.html",
+        });
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(2);
+        expect(buffer).toEqual(Buffer.from("content"));
+      });
+    });
+
     describe("when pdf format parameter is passed", () => {
       it("should return a buffer", async () => {
         mockFetch.mockResolvedValueOnce(new Response("content"));
@@ -43,7 +80,7 @@ describe("HtmlConverter", () => {
           url: "http://www.example.com/",
           pdfFormat: PdfFormat.A_3b,
         });
-        expect(mockFormDataAppend).toBeCalledTimes(2);
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(2);
         expect(buffer).toEqual(Buffer.from("content"));
       });
     });
@@ -55,7 +92,23 @@ describe("HtmlConverter", () => {
           url: "http://www.example.com/",
           properties: { size: { width: 8.3, height: 11.7 } },
         });
-        expect(mockFormDataAppend).toBeCalledTimes(3);
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(3);
+        expect(buffer).toEqual(Buffer.from("content"));
+      });
+    });
+
+    describe("when all parameters are passed", () => {
+      it("should return a buffer", async () => {
+        mockPromisesAccess.mockResolvedValue();
+        mockFetch.mockResolvedValue(new Response("content"));
+        const buffer = await converter.convert({
+          url: "http://www.example.com/",
+          header: "path/to/header.html",
+          footer: "path/to/footer.html",
+          pdfFormat: PdfFormat.A_1a,
+          properties: { size: { width: 8.3, height: 11.7 } },
+        });
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(6);
         expect(buffer).toEqual(Buffer.from("content"));
       });
     });
diff --git a/src/libre-office/utils/tests/libre-office.utils.test.ts b/src/libre-office/utils/tests/libre-office.utils.test.ts
index 835c98d7..dff96f9c 100644
--- a/src/libre-office/utils/tests/libre-office.utils.test.ts
+++ b/src/libre-office/utils/tests/libre-office.utils.test.ts
@@ -1,5 +1,6 @@
-import { LibreOfficeUtils } from "../libre-office.utils";
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
 import { promises, createReadStream } from "fs";
+import { LibreOfficeUtils } from "../libre-office.utils";
 
 import FormData from "form-data";
 
@@ -26,7 +27,7 @@ describe("LibreOfficeUtils", () => {
           ["path/to/file.docx", "path/to/file.bib"],
           data
         );
-        expect(mockFormDataAppend).toBeCalledTimes(2);
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(2);
       });
     });
 
@@ -64,7 +65,7 @@ describe("LibreOfficeUtils", () => {
           LibreOfficeUtils.injectPageProperties(data, {
             landscape: true,
           });
-          expect(mockFormDataAppend).toBeCalledTimes(1);
+          expect(mockFormDataAppend).toHaveBeenCalledTimes(1);
           expect(data.append).toHaveBeenCalledWith("landscape", "true");
         });
       });
@@ -76,7 +77,7 @@ describe("LibreOfficeUtils", () => {
           LibreOfficeUtils.injectPageProperties(data, {
             nativePageRanges: { from: 1, to: 6 },
           });
-          expect(mockFormDataAppend).toBeCalledTimes(1);
+          expect(mockFormDataAppend).toHaveBeenCalledTimes(1);
           expect(data.append).toHaveBeenCalledWith("nativePageRanges", "1-6");
         });
       });
diff --git a/src/pdf-engines/tests/pdf.engine.test.ts b/src/pdf-engines/tests/pdf.engine.test.ts
index 854c299c..a94a362f 100644
--- a/src/pdf-engines/tests/pdf.engine.test.ts
+++ b/src/pdf-engines/tests/pdf.engine.test.ts
@@ -1,5 +1,6 @@
-import FormData from "form-data";
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
 import { createReadStream, promises } from "fs";
+import FormData from "form-data";
 import fs from "fs/promises";
 import fetch from "node-fetch";
 import path from "path";
@@ -34,7 +35,7 @@ describe("PDFEngine", () => {
           files: ["path/to/file.docx", "path/to/file.bib"],
         });
         expect(buffer).toEqual(Buffer.from("content"));
-        expect(mockFormDataAppend).toBeCalledTimes(2);
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(2);
       });
     });
 
@@ -49,7 +50,7 @@ describe("PDFEngine", () => {
           merge: true,
         });
         expect(buffer).toEqual(Buffer.from("content"));
-        expect(mockFormDataAppend).toBeCalledTimes(5);
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(5);
       });
     });
   });
@@ -62,7 +63,7 @@ describe("PDFEngine", () => {
         files: ["path/to/file.pdf", "path/to/another-file.pdf"],
       });
       expect(buffer).toEqual(Buffer.from("content"));
-      expect(mockFormDataAppend).toBeCalledTimes(2);
+      expect(mockFormDataAppend).toHaveBeenCalledTimes(2);
     });
   });
 
diff --git a/src/pdf-engines/utils/tests/engine.utils.test.ts b/src/pdf-engines/utils/tests/engine.utils.test.ts
index 112a2700..0d034641 100644
--- a/src/pdf-engines/utils/tests/engine.utils.test.ts
+++ b/src/pdf-engines/utils/tests/engine.utils.test.ts
@@ -1,8 +1,9 @@
-import { PDFEngineUtils } from "./../engine.utils";
-import { promises, createReadStream } from "fs";
-
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+import { createReadStream, promises } from "fs";
 import FormData from "form-data";
 
+import { PDFEngineUtils } from "./../engine.utils";
+
 describe("PDFEngineUtils", () => {
   const mockPromisesAccess = jest.spyOn(promises, "access");
   const mockFormDataAppend = jest.spyOn(FormData.prototype, "append");
@@ -26,7 +27,7 @@ describe("PDFEngineUtils", () => {
           ["path/to/file.pdf", "path/to/another-file.pdf"],
           data
         );
-        expect(mockFormDataAppend).toBeCalledTimes(2);
+        expect(mockFormDataAppend).toHaveBeenCalledTimes(2);
       });
     });