diff --git a/packages/onenote-converter/.gitignore b/packages/onenote-converter/.gitignore
index e32c5c7723..21d9049d54 100644
--- a/packages/onenote-converter/.gitignore
+++ b/packages/onenote-converter/.gitignore
@@ -1,5 +1,6 @@
 /target
 /output
+/test-output
 
 /.idea
 *.iml
diff --git a/packages/onenote-converter/Cargo.toml b/packages/onenote-converter/Cargo.toml
index 1996fdced3..23a8a1d613 100644
--- a/packages/onenote-converter/Cargo.toml
+++ b/packages/onenote-converter/Cargo.toml
@@ -39,4 +39,4 @@ features = [
 ]
 
 [lib]
-crate-type = ["cdylib"]
\ No newline at end of file
+crate-type = ["cdylib", "lib"]
\ No newline at end of file
diff --git a/packages/onenote-converter/README.md b/packages/onenote-converter/README.md
index 2ed57c6175..7fa28a02ba 100644
--- a/packages/onenote-converter/README.md
+++ b/packages/onenote-converter/README.md
@@ -43,6 +43,8 @@ After this, the HTML should look the same and is ready to be imported by the Imp
     - package.json              -> where the project is built
     - node_functions.js         -> where the custom-made functions used inside rust goes
     ...
+    - tests                     -> Integration tests
+    ...
     - pkg                       -> artifact folder generated in the build step
         - onenote_converter.js  -> main file
     ...
@@ -58,7 +60,7 @@ To work with the project you will need:
 
 ### Running tests
 
-Tests for the project are located in the `lib` packages, but to make it work it is necessary to build this project first:
+Most tests for the project are located in the `lib` packages, but to make it work it is necessary to build this project first:
 
 `IS_CONTINUOUS_INTEGRATION=1 yarn build # for production build`
 or 
@@ -71,6 +73,21 @@ cd ../lib
 IS_CONTINUOUS_INTEGRATION=1 yarn test services/interop/InteropService_Importer_OneNote.test.
 ```
 
+Other tests are written in Rust. To run these tests, use `cargo test`:
+```
+cd packages/onenote-converter
+cargo test
+```
+
+### Debugging tests
+
+Suppose that the importer's Rust code is failing to parse a specific `example.one` file. In this case, it may be useful to step through part of the import process in a debugger. If using VSCode, this can be done by:
+1. Adding a new test to `tests/convert.rs` that runs `convert()` on the `example.one` file.
+2. Setting up Rust and Rust debugging. See [the relevant VSCode documentation](https://code.visualstudio.com/docs/languages/rust#_debugging) for details.
+3. Clicking the "Debug" button for the test added in step 1. This button should be provided by extensions set up in step 2.
+
+
+
 ### Developing
 
 When working with the Rust code you will probably rather run `yarn buildDev` since it is faster and it has more logging messages (they can be disabled in the macro `log!()`)
diff --git a/packages/onenote-converter/assets/test-data/single-page/Open Notebook.onetoc2 b/packages/onenote-converter/assets/test-data/single-page/Open Notebook.onetoc2
new file mode 100644
index 0000000000..e541aea5fc
Binary files /dev/null and b/packages/onenote-converter/assets/test-data/single-page/Open Notebook.onetoc2 differ
diff --git a/packages/onenote-converter/assets/test-data/single-page/Untitled Section.one b/packages/onenote-converter/assets/test-data/single-page/Untitled Section.one
new file mode 100644
index 0000000000..88fcb9732f
Binary files /dev/null and b/packages/onenote-converter/assets/test-data/single-page/Untitled Section.one differ
diff --git a/packages/onenote-converter/node_functions.js b/packages/onenote-converter/node_functions.js
index b0bb47914c..b7df809650 100644
--- a/packages/onenote-converter/node_functions.js
+++ b/packages/onenote-converter/node_functions.js
@@ -23,16 +23,6 @@ function removePrefix(basePath, prefix) {
 	return basePath.replace(prefix, '');
 }
 
-function getOutputPath(inputDir, outputDir, filePath) {
-	const basePathFromInputFolder = filePath.replace(inputDir, '');
-	const newOutput = path.join(outputDir, basePathFromInputFolder);
-	return path.dirname(newOutput);
-}
-
-function getParentDir(filePath) {
-	return path.basename(path.dirname(filePath));
-}
-
 function normalizeAndWriteFile(filePath, data) {
 	filePath = path.normalize(filePath);
 	fs.writeFileSync(filePath, data);
@@ -43,7 +33,5 @@ module.exports = {
 	isDirectory,
 	readDir,
 	removePrefix,
-	getOutputPath,
-	getParentDir,
 	normalizeAndWriteFile,
 };
diff --git a/packages/onenote-converter/src/lib.rs b/packages/onenote-converter/src/lib.rs
index 3dc7a51211..48addbc7b1 100644
--- a/packages/onenote-converter/src/lib.rs
+++ b/packages/onenote-converter/src/lib.rs
@@ -1,11 +1,9 @@
 pub use crate::parser::Parser;
-use color_eyre::eyre::eyre;
-use color_eyre::eyre::Result;
+use color_eyre::eyre::{eyre, Result};
 use std::panic;
 use wasm_bindgen::prelude::wasm_bindgen;
 
-use crate::utils::utils::{log, log_warn};
-use crate::utils::{get_file_extension, get_file_name, get_output_path, get_parent_dir};
+use crate::utils::{fs_driver, utils::{log, log_warn}};
 
 mod notebook;
 mod page;
@@ -37,14 +35,11 @@ fn _main(input_path: &str, output_dir: &str, base_path: &str) -> Result<()> {
 pub fn convert(path: &str, output_dir: &str, base_path: &str) -> Result<()> {
     let mut parser = Parser::new();
 
-    let extension: String = unsafe { get_file_extension(path) }
-        .unwrap()
-        .as_string()
-        .unwrap();
+    let extension: String = fs_driver().get_file_extension(path);
 
     match extension.as_str() {
         ".one" => {
-            let _name: String = unsafe { get_file_name(path) }.unwrap().as_string().unwrap();
+            let _name: String = fs_driver().get_file_name(path).expect("Missing file name");
             log!("Parsing .one file: {}", _name);
 
             if path.contains("OneNote_RecycleBin") {
@@ -53,29 +48,24 @@ pub fn convert(path: &str, output_dir: &str, base_path: &str) -> Result<()> {
 
             let section = parser.parse_section(path.to_owned())?;
 
-            let section_output_dir = unsafe { get_output_path(base_path, output_dir, path) }
-                .unwrap()
-                .as_string()
-                .unwrap();
-
+            let section_output_dir = fs_driver().get_output_path(base_path, output_dir, path);
             section::Renderer::new().render(&section, section_output_dir.to_owned())?;
         }
         ".onetoc2" => {
-            let _name: String = unsafe { get_file_name(path) }.unwrap().as_string().unwrap();
+            let _name: String = fs_driver().get_file_name(path).expect("Missing file name");
             log!("Parsing .onetoc2 file: {}", _name);
 
             let notebook = parser.parse_notebook(path.to_owned())?;
 
-            let notebook_name = unsafe { get_parent_dir(path) }
-                .expect("Input file has no parent folder")
-                .as_string()
-                .expect("Parent folder has no name");
+            let notebook_name = fs_driver()
+                .get_parent_dir(path)
+                .expect("Input file has no parent folder");
+            if notebook_name == "" {
+                panic!("Parent directory has no name");
+            }
             log!("notebook name: {:?}", notebook_name);
 
-            let notebook_output_dir = unsafe { get_output_path(base_path, output_dir, path) }
-                .unwrap()
-                .as_string()
-                .unwrap();
+            let notebook_output_dir = fs_driver().get_output_path(base_path, output_dir, path);
             log!("Notebok directory: {:?}", notebook_output_dir);
 
             notebook::Renderer::new().render(&notebook, &notebook_name, &notebook_output_dir)?;
@@ -85,3 +75,4 @@ pub fn convert(path: &str, output_dir: &str, base_path: &str) -> Result<()> {
 
     Ok(())
 }
+
diff --git a/packages/onenote-converter/src/notebook.rs b/packages/onenote-converter/src/notebook.rs
index 460d690460..1b3251491a 100644
--- a/packages/onenote-converter/src/notebook.rs
+++ b/packages/onenote-converter/src/notebook.rs
@@ -2,8 +2,8 @@ use crate::parser::notebook::Notebook;
 use crate::parser::property::common::Color;
 use crate::parser::section::{Section, SectionEntry};
 use crate::templates::notebook::Toc;
+use crate::utils::fs_driver;
 use crate::utils::utils::log;
-use crate::utils::{join_path, make_dir, remove_prefix};
 use crate::{section, templates};
 use color_eyre::eyre::Result;
 use palette::rgb::Rgb;
@@ -20,12 +20,12 @@ impl Renderer {
 
     pub fn render(&mut self, notebook: &Notebook, name: &str, output_dir: &str) -> Result<()> {
         log!("Notebook name: {:?} {:?}", name, output_dir);
-        let _ = unsafe { make_dir(output_dir) };
+        fs_driver().make_dir(output_dir)?;
 
         // let notebook_dir = unsafe { join_path(output_dir, sanitize_filename::sanitize(name).as_str()) }.unwrap().as_string().unwrap();
         let notebook_dir = output_dir.to_owned();
 
-        let _ = unsafe { make_dir(&notebook_dir) };
+        fs_driver().make_dir(&notebook_dir)?;
 
         let mut toc = Vec::new();
 
@@ -41,13 +41,10 @@ impl Renderer {
                 SectionEntry::SectionGroup(group) => {
                     let dir_name = sanitize_filename::sanitize(group.display_name());
                     let section_group_dir =
-                        unsafe { join_path(notebook_dir.as_str(), dir_name.as_str()) }
-                            .unwrap()
-                            .as_string()
-                            .unwrap();
+                        fs_driver().join(notebook_dir.as_str(), dir_name.as_str());
 
                     log!("Section group directory: {:?}", section_group_dir);
-                    let _ = unsafe { make_dir(section_group_dir.as_str()) };
+                    fs_driver().make_dir(section_group_dir.as_str())?;
 
                     let mut entries = Vec::new();
 
@@ -84,10 +81,7 @@ impl Renderer {
         let section_path = renderer.render(section, notebook_dir)?;
         log!("section_path: {:?}", section_path);
 
-        let path_from_base_dir = unsafe { remove_prefix(section_path, base_dir.as_str()) }
-            .unwrap()
-            .as_string()
-            .unwrap();
+        let path_from_base_dir = String::from(fs_driver().remove_prefix(&section_path, &base_dir));
         log!("path_from_base_dir: {:?}", path_from_base_dir);
         Ok(templates::notebook::Section {
             name: section.display_name().to_string(),
diff --git a/packages/onenote-converter/src/page/embedded_file.rs b/packages/onenote-converter/src/page/embedded_file.rs
index 1245a30e1e..1ebeede0ed 100644
--- a/packages/onenote-converter/src/page/embedded_file.rs
+++ b/packages/onenote-converter/src/page/embedded_file.rs
@@ -1,8 +1,8 @@
 use crate::page::Renderer;
 use crate::parser::contents::EmbeddedFile;
 use crate::parser::property::embedded_file::FileType;
+use crate::utils::fs_driver;
 use crate::utils::utils::log;
-use crate::utils::{join_path, write_file};
 use color_eyre::eyre::ContextCompat;
 use color_eyre::Result;
 use std::path::PathBuf;
@@ -12,12 +12,9 @@ impl<'a> Renderer<'a> {
         let content;
 
         let filename = self.determine_filename(file.filename())?;
-        let path = unsafe { join_path(self.output.as_str(), filename.as_str()) }
-            .unwrap()
-            .as_string()
-            .unwrap();
+        let path = fs_driver().join(self.output.as_str(), filename.as_str());
         log!("Rendering embedded file: {:?}", path);
-        let _ = unsafe { write_file(path.as_str(), file.data()) };
+        fs_driver().write_file(&path, file.data())?;
 
         let file_type = Self::guess_type(file);
 
diff --git a/packages/onenote-converter/src/page/image.rs b/packages/onenote-converter/src/page/image.rs
index 03cf7b4d91..9fe641428e 100644
--- a/packages/onenote-converter/src/page/image.rs
+++ b/packages/onenote-converter/src/page/image.rs
@@ -1,7 +1,7 @@
 use crate::page::Renderer;
 use crate::parser::contents::Image;
 use crate::utils::utils::log;
-use crate::utils::{join_path, px, write_file, AttributeSet, StyleSet};
+use crate::utils::{fs_driver, px, AttributeSet, StyleSet};
 use color_eyre::Result;
 
 impl<'a> Renderer<'a> {
@@ -10,12 +10,9 @@ impl<'a> Renderer<'a> {
 
         if let Some(data) = image.data() {
             let filename = self.determine_image_filename(image)?;
-            let path = unsafe { join_path(self.output.as_str(), filename.as_str()) }
-                .unwrap()
-                .as_string()
-                .unwrap();
+            let path = fs_driver().join(self.output.as_str(), filename.as_str());
             log!("Rendering image: {:?}", path);
-            let _ = unsafe { write_file(path.as_str(), data) };
+            fs_driver().write_file(path.as_str(), data)?;
 
             let mut attrs = AttributeSet::new();
             let mut styles = StyleSet::new();
diff --git a/packages/onenote-converter/src/parser/one/property_set/page_series_node.rs b/packages/onenote-converter/src/parser/one/property_set/page_series_node.rs
index d4796e15ef..ae9db72113 100644
--- a/packages/onenote-converter/src/parser/one/property_set/page_series_node.rs
+++ b/packages/onenote-converter/src/parser/one/property_set/page_series_node.rs
@@ -1,4 +1,3 @@
-use crate::log_warn;
 use crate::parser::errors::{ErrorKind, Result};
 use crate::parser::fsshttpb::data::cell_id::CellId;
 use crate::parser::fsshttpb::data::exguid::ExGuid;
@@ -9,6 +8,7 @@ use crate::parser::one::property::{simple, PropertyType};
 use crate::parser::one::property_set::PropertySetId;
 use crate::parser::onestore::object::Object;
 use crate::parser::shared::guid::Guid;
+use crate::utils::utils::log_warn;
 
 /// A page series.
 ///
diff --git a/packages/onenote-converter/src/parser/onenote/mod.rs b/packages/onenote-converter/src/parser/onenote/mod.rs
index a8c9092c1f..a14618e592 100644
--- a/packages/onenote-converter/src/parser/onenote/mod.rs
+++ b/packages/onenote-converter/src/parser/onenote/mod.rs
@@ -4,11 +4,8 @@ use crate::parser::onenote::notebook::Notebook;
 use crate::parser::onenote::section::{Section, SectionEntry, SectionGroup};
 use crate::parser::onestore::parse_store;
 use crate::parser::reader::Reader;
-use crate::parser::utils::{exists, is_directory, read_dir, read_file};
+use crate::utils::fs_driver;
 use crate::utils::utils::log;
-use crate::utils::{get_dir_name, get_file_extension, get_file_name, join_path};
-use std::panic;
-use web_sys::js_sys::Uint8Array;
 
 pub(crate) mod content;
 pub(crate) mod embedded_file;
@@ -26,7 +23,6 @@ pub(crate) mod rich_text;
 pub(crate) mod section;
 pub(crate) mod table;
 
-extern crate console_error_panic_hook;
 extern crate lazy_static;
 
 /// The OneNote file parser.
@@ -35,7 +31,6 @@ pub struct Parser;
 impl Parser {
     /// Create a new OneNote file parser.
     pub fn new() -> Parser {
-        panic::set_hook(Box::new(console_error_panic_hook::hook));
         Parser {}
     }
 
@@ -46,9 +41,7 @@ impl Parser {
     /// sections from the folder that the table of contents file is in.
     pub fn parse_notebook(&mut self, path: String) -> Result<Notebook> {
         log!("Parsing notebook: {:?}", path);
-        let file_content = unsafe { read_file(path.as_str()) }.unwrap();
-        let array = Uint8Array::new(&file_content);
-        let data = array.to_vec();
+        let data = fs_driver().read_file(&path)?;
         let packaging = OneStorePackaging::parse(&mut Reader::new(&data))?;
         let store = parse_store(&packaging)?;
 
@@ -56,29 +49,20 @@ impl Parser {
             return Err(ErrorKind::NotATocFile { file: path }.into());
         }
 
-        let base_dir = unsafe { get_dir_name(path.as_str()) }
-            .expect("base dir not found")
-            .as_string()
-            .unwrap();
+        let base_dir = fs_driver().get_dir_name(&path);
         let sections = notebook::parse_toc(store.data_root())?
             .iter()
-            .map(|name| {
-                let result = unsafe { join_path(base_dir.as_str(), name) }
-                    .unwrap()
-                    .as_string()
-                    .unwrap();
-                return result;
-            })
+            .map(|name| fs_driver().join(&base_dir, name))
             .filter(|p| !p.contains("OneNote_RecycleBin"))
             .filter(|p| {
-                let is_file = match unsafe { exists(p.as_str()) } {
+                let is_file = match fs_driver().exists(p) {
                     Ok(is_file) => is_file,
                     Err(_err) => false,
                 };
                 return is_file;
             })
             .map(|p| {
-                let is_dir = unsafe { is_directory(p.as_str()) }.unwrap();
+                let is_dir = fs_driver().is_directory(&p)?;
                 if !is_dir {
                     self.parse_section(p).map(SectionEntry::Section)
                 } else {
@@ -96,9 +80,7 @@ impl Parser {
     /// OneNote section.
     pub fn parse_section(&mut self, path: String) -> Result<Section> {
         log!("Parsing section: {:?}", path);
-        let file_content = unsafe { read_file(path.as_str()) }.unwrap();
-        let array = Uint8Array::new(&file_content);
-        let data = array.to_vec();
+        let data = fs_driver().read_file(path.as_str())?;
         let packaging = OneStorePackaging::parse(&mut Reader::new(&data))?;
         let store = parse_store(&packaging)?;
 
@@ -106,25 +88,20 @@ impl Parser {
             return Err(ErrorKind::NotASectionFile { file: path }.into());
         }
 
-        let filename = unsafe { get_file_name(path.as_str()) }
-            .expect("file without file name")
-            .as_string()
-            .unwrap();
+        let filename = fs_driver()
+            .get_file_name(&path)
+            .expect("file without file name");
         section::parse_section(store, filename)
     }
 
     fn parse_section_group(&mut self, path: String) -> Result<SectionGroup> {
-        let display_name = unsafe { get_file_name(path.as_str()) }
-            .expect("file without file name")
-            .as_string()
-            .unwrap();
+        let display_name = fs_driver()
+            .get_file_name(path.as_str())
+            .expect("file without file name");
 
-        if let Some(entries) = unsafe { read_dir(path.as_str()) } {
+        if let Ok(entries) = fs_driver().read_dir(&path) {
             for entry in entries {
-                let ext = unsafe { get_file_extension(entry.as_str()) }
-                    .unwrap()
-                    .as_string()
-                    .unwrap();
+                let ext = fs_driver().get_file_extension(&entry);
                 if ext == ".onetoc2" {
                     return self.parse_notebook(entry).map(|group| SectionGroup {
                         display_name,
diff --git a/packages/onenote-converter/src/parser/onestore/mod.rs b/packages/onenote-converter/src/parser/onestore/mod.rs
index 8a8e747099..e1830ba9bb 100644
--- a/packages/onenote-converter/src/parser/onestore/mod.rs
+++ b/packages/onenote-converter/src/parser/onestore/mod.rs
@@ -31,7 +31,7 @@ impl<'a> OneStore<'a> {
         self.schema
     }
 
-    pub(crate) fn data_root(&'a self) -> &'a ObjectSpace {
+    pub(crate) fn data_root(&self) -> &ObjectSpace {
         &self.data_root
     }
 
diff --git a/packages/onenote-converter/src/parser/utils.rs b/packages/onenote-converter/src/parser/utils.rs
index 372de64384..498321b985 100644
--- a/packages/onenote-converter/src/parser/utils.rs
+++ b/packages/onenote-converter/src/parser/utils.rs
@@ -3,8 +3,6 @@ use itertools::Itertools;
 use std::collections::HashMap;
 use std::fmt;
 use std::fmt::Display;
-use wasm_bindgen::prelude::wasm_bindgen;
-use wasm_bindgen::JsValue;
 use widestring::U16CString;
 
 pub(crate) struct AttributeSet(HashMap<&'static str, String>);
@@ -69,35 +67,6 @@ impl Display for StyleSet {
     }
 }
 
-#[wasm_bindgen(module = "/node_functions.js")]
-extern "C" {
-    #[wasm_bindgen(js_name = isDirectory, catch)]
-    pub unsafe fn is_directory(path: &str) -> std::result::Result<bool, JsValue>;
-
-    #[wasm_bindgen(js_name = readDir, catch)]
-    unsafe fn read_dir_js(path: &str) -> std::result::Result<JsValue, JsValue>;
-}
-
-pub unsafe fn read_dir(path: &str) -> Option<Vec<String>> {
-    let result_ptr = read_dir_js(path).unwrap();
-
-    let result_str: String = match result_ptr.as_string() {
-        Some(x) => x,
-        _ => String::new(),
-    };
-    let names: Vec<String> = result_str.split('\n').map(|s| s.to_string()).collect_vec();
-    Some(names)
-}
-
-#[wasm_bindgen(module = "fs")]
-extern "C" {
-    #[wasm_bindgen(js_name = readFileSync, catch)]
-    pub unsafe fn read_file(path: &str) -> std::result::Result<JsValue, JsValue>;
-
-    #[wasm_bindgen(js_name = existsSync, catch)]
-    pub unsafe fn exists(path: &str) -> std::result::Result<bool, JsValue>;
-}
-
 pub(crate) trait Utf16ToString {
     fn utf16_to_string(&self) -> Result<String>;
 }
diff --git a/packages/onenote-converter/src/section.rs b/packages/onenote-converter/src/section.rs
index 8c3dc22fc5..a0a71a53b0 100644
--- a/packages/onenote-converter/src/section.rs
+++ b/packages/onenote-converter/src/section.rs
@@ -1,6 +1,6 @@
 use crate::parser::section::Section;
+use crate::utils::fs_driver;
 use crate::utils::utils::log;
-use crate::utils::{join_path, make_dir, remove_prefix, write_file};
 use crate::{page, templates};
 use color_eyre::eyre::Result;
 use std::collections::HashSet;
@@ -19,15 +19,10 @@ impl Renderer {
     }
 
     pub fn render(&mut self, section: &Section, output_dir: String) -> Result<String> {
-        let section_dir = unsafe {
-            join_path(
-                output_dir.as_str(),
-                sanitize_filename::sanitize(section.display_name()).as_str(),
-            )
-        }
-        .unwrap()
-        .as_string()
-        .unwrap();
+        let section_dir = fs_driver().join(
+            output_dir.as_str(),
+            sanitize_filename::sanitize(section.display_name()).as_str(),
+        );
         log!(
             "section_dir: {:?} \n output_dir: {:?}",
             section_dir,
@@ -35,7 +30,7 @@ impl Renderer {
         );
 
         log!("Rendering section: {:?}", section_dir);
-        let _ = unsafe { make_dir(section_dir.as_str()) };
+        fs_driver().make_dir(section_dir.as_str())?;
 
         let mut toc = Vec::new();
         let mut fallback_title_index = 0;
@@ -52,38 +47,27 @@ impl Renderer {
                 let file_name = self.determine_page_filename(&file_name)?;
                 let file_name = sanitize_filename::sanitize(file_name + ".html");
 
-                let page_path = unsafe { join_path(section_dir.as_str(), file_name.as_str()) }
-                    .unwrap()
-                    .as_string()
-                    .unwrap();
+                let page_path = fs_driver().join(section_dir.as_str(), file_name.as_str());
 
                 let mut renderer = page::Renderer::new(section_dir.clone(), self);
                 let page_html = renderer.render_page(page)?;
 
                 log!("Creating page file: {:?}", page_path);
-                let _ = unsafe { write_file(&page_path, page_html.as_bytes()) };
+                fs_driver().write_file(&page_path, page_html.as_bytes())?;
 
                 let page_path_without_basedir =
-                    unsafe { remove_prefix(page_path, output_dir.as_str()) }
-                        .unwrap()
-                        .as_string()
-                        .unwrap();
+                    String::from(fs_driver().remove_prefix(&page_path, output_dir.as_str()));
                 toc.push((title, page_path_without_basedir, page.level()))
             }
         }
 
         let toc_html = templates::section::render(section.display_name(), toc)?;
-        let toc_file = unsafe {
-            join_path(
-                output_dir.as_str(),
-                format!("{}.html", section.display_name()).as_str(),
-            )
-        }
-        .unwrap()
-        .as_string()
-        .unwrap();
+        let toc_file = fs_driver().join(
+            output_dir.as_str(),
+            format!("{}.html", section.display_name()).as_str(),
+        );
         log!("ToC: {:?}", toc_file);
-        let _ = unsafe { write_file(toc_file.as_str(), toc_html.as_bytes()) };
+        fs_driver().write_file(toc_file.as_str(), toc_html.as_bytes())?;
 
         Ok(section_dir)
     }
diff --git a/packages/onenote-converter/src/utils/file_api/api.rs b/packages/onenote-converter/src/utils/file_api/api.rs
new file mode 100644
index 0000000000..affe47d17c
--- /dev/null
+++ b/packages/onenote-converter/src/utils/file_api/api.rs
@@ -0,0 +1,45 @@
+pub type ApiResult<T> = std::result::Result<T, std::io::Error>;
+
+pub trait FileApiDriver: Send + Sync {
+    fn is_directory(&self, path: &str) -> ApiResult<bool>;
+    fn read_dir(&self, path: &str) -> ApiResult<Vec<String>>;
+    fn read_file(&self, path: &str) -> ApiResult<Vec<u8>>;
+    fn write_file(&self, path: &str, data: &[u8]) -> ApiResult<()>;
+    fn make_dir(&self, path: &str) -> ApiResult<()>;
+    fn exists(&self, path: &str) -> ApiResult<bool>;
+
+    // These functions correspond to the similarly-named
+    // path functions.
+    fn get_file_name(&self, path: &str) -> Option<String>;
+    fn get_file_extension(&self, path: &str) -> String;
+    fn get_dir_name(&self, path: &str) -> String;
+    fn join(&self, path_1: &str, path_2: &str) -> String;
+
+    fn remove_prefix<'a>(&self, full_path: &'a str, prefix: &str) -> &'a str {
+        if full_path.starts_with(prefix) {
+            &full_path[prefix.len()..]
+        } else {
+            full_path
+        }
+    }
+    fn get_output_path(&self, input_dir: &str, output_dir: &str, file_path: &str) -> String {
+        let base_path = self.remove_prefix(file_path, input_dir);
+        let rebased_output = self.join(output_dir, base_path);
+        self.get_dir_name(&rebased_output)
+    }
+
+    fn get_parent_dir(&self, path: &str) -> Option<String> {
+        let dir_name = self.get_dir_name(path);
+        let result = self.get_file_name(&dir_name);
+
+        if let Some(value) = result {
+            if value == "" {
+                None
+            } else {
+                Some(value)
+            }
+        } else {
+            None
+        }
+    }
+}
diff --git a/packages/onenote-converter/src/utils/file_api/mod.rs b/packages/onenote-converter/src/utils/file_api/mod.rs
new file mode 100644
index 0000000000..1877b09699
--- /dev/null
+++ b/packages/onenote-converter/src/utils/file_api/mod.rs
@@ -0,0 +1,23 @@
+pub mod api;
+pub use api::ApiResult;
+pub use api::FileApiDriver;
+use lazy_static::lazy_static;
+use std::sync::Arc;
+
+#[cfg(target_arch = "wasm32")]
+mod wasm_driver;
+#[cfg(target_arch = "wasm32")]
+use wasm_driver::FileApiDriverImpl;
+
+#[cfg(not(target_arch = "wasm32"))]
+mod native_driver;
+#[cfg(not(target_arch = "wasm32"))]
+use native_driver::FileApiDriverImpl;
+
+lazy_static! {
+    static ref FS_DRIVER: Arc<dyn FileApiDriver> = Arc::new(FileApiDriverImpl {});
+}
+
+pub fn fs_driver() -> Arc<dyn FileApiDriver> {
+    FS_DRIVER.clone()
+}
diff --git a/packages/onenote-converter/src/utils/file_api/native_driver.rs b/packages/onenote-converter/src/utils/file_api/native_driver.rs
new file mode 100644
index 0000000000..a86bdb9729
--- /dev/null
+++ b/packages/onenote-converter/src/utils/file_api/native_driver.rs
@@ -0,0 +1,64 @@
+use super::ApiResult;
+use super::FileApiDriver;
+use std::fs;
+use std::path::Path;
+
+pub struct FileApiDriverImpl {}
+
+impl FileApiDriver for FileApiDriverImpl {
+    fn is_directory(&self, path: &str) -> ApiResult<bool> {
+        let metadata = fs::metadata(path)?;
+        let file_type = metadata.file_type();
+        Ok(file_type.is_dir())
+    }
+
+    fn read_dir(&self, path: &str) -> ApiResult<Vec<String>> {
+        let mut result: Vec<String> = Vec::new();
+        for item in fs::read_dir(path)? {
+            let item = item?.path();
+            result.push(item.to_string_lossy().into())
+        }
+        Ok(result)
+    }
+
+    fn read_file(&self, path: &str) -> ApiResult<Vec<u8>> {
+        Ok(fs::read(path)?)
+    }
+
+    fn write_file(&self, path: &str, data: &[u8]) -> ApiResult<()> {
+        Ok(fs::write(path, data)?)
+    }
+
+    fn exists(&self, path: &str) -> ApiResult<bool> {
+        Ok(fs::exists(path)?)
+    }
+
+    fn make_dir(&self, path: &str) -> ApiResult<()> {
+        Ok(fs::create_dir(path)?)
+    }
+
+    fn get_file_name(&self, path: &str) -> Option<String> {
+        match Path::new(path).file_name() {
+            Some(name) => Some(name.to_string_lossy().into()),
+            None => None,
+        }
+    }
+    fn get_file_extension(&self, path: &str) -> String {
+        match Path::new(path).extension() {
+            Some(ext) => {
+                let extension = String::from(ext.to_string_lossy());
+                String::from(".") + &extension
+            }
+            None => String::from(""),
+        }
+    }
+    fn get_dir_name(&self, path: &str) -> String {
+        match Path::new(path).parent() {
+            Some(parent) => parent.to_string_lossy().into(),
+            None => String::from(""),
+        }
+    }
+    fn join(&self, path_1: &str, path_2: &str) -> String {
+        Path::new(path_1).join(path_2).to_string_lossy().into()
+    }
+}
diff --git a/packages/onenote-converter/src/utils/file_api/wasm_driver.rs b/packages/onenote-converter/src/utils/file_api/wasm_driver.rs
new file mode 100644
index 0000000000..da79c942a3
--- /dev/null
+++ b/packages/onenote-converter/src/utils/file_api/wasm_driver.rs
@@ -0,0 +1,140 @@
+use super::ApiResult;
+use super::FileApiDriver;
+use wasm_bindgen::prelude::wasm_bindgen;
+use wasm_bindgen::JsValue;
+use web_sys::js_sys;
+use web_sys::js_sys::Uint8Array;
+
+#[wasm_bindgen(module = "/node_functions.js")]
+extern "C" {
+    #[wasm_bindgen(js_name = mkdirSyncRecursive, catch)]
+    fn make_dir(path: &str) -> std::result::Result<JsValue, JsValue>;
+
+    #[wasm_bindgen(js_name = pathSep, catch)]
+    fn path_sep() -> std::result::Result<JsValue, JsValue>;
+
+    #[wasm_bindgen(js_name = removePrefix, catch)]
+    fn remove_prefix(base_path: String, prefix: &str) -> std::result::Result<JsValue, JsValue>;
+
+    #[wasm_bindgen(js_name = getOutputPath, catch)]
+    fn get_output_path(
+        input_dir: &str,
+        output_dir: &str,
+        file_path: &str,
+    ) -> std::result::Result<JsValue, JsValue>;
+
+    #[wasm_bindgen(js_name = normalizeAndWriteFile, catch)]
+    fn write_file(path: &str, data: &[u8]) -> std::result::Result<JsValue, JsValue>;
+
+    #[wasm_bindgen(js_name = isDirectory, catch)]
+    fn is_directory(path: &str) -> std::result::Result<bool, JsValue>;
+
+    #[wasm_bindgen(js_name = readDir, catch)]
+    fn read_dir_js(path: &str) -> std::result::Result<JsValue, JsValue>;
+}
+
+#[wasm_bindgen(module = "fs")]
+extern "C" {
+    #[wasm_bindgen(js_name = readFileSync, catch)]
+    fn read_file(path: &str) -> std::result::Result<JsValue, JsValue>;
+
+    #[wasm_bindgen(js_name = existsSync, catch)]
+    fn exists(path: &str) -> std::result::Result<bool, JsValue>;
+}
+
+#[wasm_bindgen(module = "path")]
+extern "C" {
+    #[wasm_bindgen(js_name = basename, catch)]
+    fn get_file_name(path: &str) -> std::result::Result<JsValue, JsValue>;
+
+    #[wasm_bindgen(js_name = extname, catch)]
+    fn get_file_extension(path: &str) -> std::result::Result<JsValue, JsValue>;
+
+    #[wasm_bindgen(js_name = dirname, catch)]
+    fn get_dir_name(path: &str) -> std::result::Result<JsValue, JsValue>;
+
+    #[wasm_bindgen(js_name = join, catch)]
+    fn join_path(path_1: &str, path_2: &str) -> std::result::Result<JsValue, JsValue>;
+}
+
+fn handle_error(error: JsValue, source: &str) -> std::io::Error {
+    use std::io::Error;
+    use std::io::ErrorKind;
+
+    let error = js_sys::Error::from(error);
+    match error.name().to_string() {
+        _ => Error::new(
+            ErrorKind::Other,
+            String::from(format!("Err({}): {:?}", source, error)),
+        ),
+    }
+}
+
+pub struct FileApiDriverImpl {}
+
+impl FileApiDriver for FileApiDriverImpl {
+    fn is_directory(&self, path: &str) -> ApiResult<bool> {
+        match is_directory(path) {
+            Ok(is_dir) => Ok(is_dir),
+            Err(e) => Err(handle_error(e, "checking is_directory")),
+        }
+    }
+
+    fn read_dir(&self, path: &str) -> ApiResult<Vec<String>> {
+        let result_ptr = read_dir_js(path).unwrap();
+
+        let result_str: String = match result_ptr.as_string() {
+            Some(x) => x,
+            _ => String::new(),
+        };
+        Ok(result_str.split('\n').map(|s| s.to_string()).collect())
+    }
+
+    fn read_file(&self, path: &str) -> ApiResult<Vec<u8>> {
+        match read_file(path) {
+            Ok(file) => Ok(Uint8Array::new(&file).to_vec()),
+            Err(e) => Err(handle_error(e, &format!("reading file {}", path))),
+        }
+    }
+
+    fn write_file(&self, path: &str, data: &[u8]) -> ApiResult<()> {
+        if let Err(error) = write_file(path, data) {
+            Err(handle_error(error, &format!("writing file {}", path)))
+        } else {
+            Ok(())
+        }
+    }
+
+    fn exists(&self, path: &str) -> ApiResult<bool> {
+        match exists(path) {
+            Ok(exists) => Ok(exists),
+            Err(e) => Err(handle_error(e, &format!("checking exists {}", path))),
+        }
+    }
+
+    fn make_dir(&self, path: &str) -> ApiResult<()> {
+        if let Err(error) = make_dir(path) {
+            Err(handle_error(error, &format!("mkdir {}", path)))
+        } else {
+            Ok(())
+        }
+    }
+
+    fn get_file_name(&self, path: &str) -> Option<String> {
+        let file_name = get_file_name(path).unwrap().as_string().unwrap();
+        if file_name == "" {
+            None
+        } else {
+            Some(file_name)
+        }
+    }
+    fn get_file_extension(&self, path: &str) -> String {
+        get_file_extension(path).unwrap().as_string().unwrap()
+    }
+    fn get_dir_name(&self, path: &str) -> String {
+        get_dir_name(path).unwrap().as_string().unwrap()
+    }
+    fn join(&self, path_1: &str, path_2: &str) -> String {
+        join_path(path_1, path_2).unwrap().as_string().unwrap()
+    }
+}
diff --git a/packages/onenote-converter/src/utils.rs b/packages/onenote-converter/src/utils/mod.rs
similarity index 57%
rename from packages/onenote-converter/src/utils.rs
rename to packages/onenote-converter/src/utils/mod.rs
index 23c797cac9..646cc99a46 100644
--- a/packages/onenote-converter/src/utils.rs
+++ b/packages/onenote-converter/src/utils/mod.rs
@@ -5,10 +5,12 @@ use std::collections::HashMap;
 use std::fmt;
 use std::fmt::Display;
 use std::sync::Mutex;
-use wasm_bindgen::prelude::wasm_bindgen;
-use wasm_bindgen::JsValue;
 use widestring::U16CString;
 
+mod file_api;
+pub use file_api::fs_driver;
+pub use file_api::FileApiDriver;
+
 pub(crate) fn px(inches: f32) -> String {
     format!("{}px", (inches * 48.0).round())
 }
@@ -74,63 +76,8 @@ impl Display for StyleSet {
     }
 }
 
-#[wasm_bindgen(module = "/node_functions.js")]
-extern "C" {
-    #[wasm_bindgen(js_name = mkdirSyncRecursive, catch)]
-    pub unsafe fn make_dir(path: &str) -> std::result::Result<JsValue, JsValue>;
-
-    #[wasm_bindgen(js_name = pathSep, catch)]
-    pub unsafe fn path_sep() -> std::result::Result<JsValue, JsValue>;
-
-    #[wasm_bindgen(js_name = removePrefix, catch)]
-    pub unsafe fn remove_prefix(
-        base_path: String,
-        prefix: &str,
-    ) -> std::result::Result<JsValue, JsValue>;
-
-    #[wasm_bindgen(js_name = getOutputPath, catch)]
-    pub unsafe fn get_output_path(
-        input_dir: &str,
-        output_dir: &str,
-        file_path: &str,
-    ) -> std::result::Result<JsValue, JsValue>;
-
-    #[wasm_bindgen(js_name = getParentDir, catch)]
-    pub unsafe fn get_parent_dir(input_dir: &str) -> std::result::Result<JsValue, JsValue>;
-
-    #[wasm_bindgen(js_name = normalizeAndWriteFile, catch)]
-    pub unsafe fn write_file(path: &str, data: &[u8]) -> std::result::Result<JsValue, JsValue>;
-}
-
-#[wasm_bindgen(module = "fs")]
-extern "C" {
-    // #[wasm_bindgen(js_name = writeFileSync, catch)]
-    // pub unsafe fn write_file(path: &str, data: &[u8]) -> std::result::Result<JsValue, JsValue>;
-
-    #[wasm_bindgen(js_name = readFileSync, catch)]
-    pub unsafe fn read_file(path: &str) -> std::result::Result<JsValue, JsValue>;
-
-    #[wasm_bindgen(js_name = existsSync, catch)]
-    pub unsafe fn exists(path: &str) -> std::result::Result<bool, JsValue>;
-}
-
-#[wasm_bindgen(module = "path")]
-extern "C" {
-    #[wasm_bindgen(js_name = basename, catch)]
-    pub unsafe fn get_file_name(path: &str) -> std::result::Result<JsValue, JsValue>;
-
-    #[wasm_bindgen(js_name = extname, catch)]
-    pub unsafe fn get_file_extension(path: &str) -> std::result::Result<JsValue, JsValue>;
-
-    #[wasm_bindgen(js_name = dirname, catch)]
-    pub unsafe fn get_dir_name(path: &str) -> std::result::Result<JsValue, JsValue>;
-
-    #[wasm_bindgen(js_name = join, catch)]
-    pub unsafe fn join_path(path_1: &str, path_2: &str) -> std::result::Result<JsValue, JsValue>;
-}
-
 pub mod utils {
-
+    #[cfg(target_arch = "wasm32")]
     macro_rules! log {
         ( $( $t:tt )* ) => {
             #[cfg(debug_assertions)]
@@ -138,15 +85,32 @@ pub mod utils {
         }
     }
 
+    #[cfg(target_arch = "wasm32")]
     macro_rules! log_warn {
         ( $( $t:tt )* ) => {
             use crate::utils::get_current_page;
 
-            web_sys::console::warn_1(&format!("OneNoteConverter: Warning around the following page: {}", get_current_page().unwrap()).into());
+            web_sys::console::warn_1(&format!("OneNoteConverter: Warning around the following page: {}", get_current_page()).into());
             web_sys::console::warn_2(&format!("OneNoteConverter: ").into(), &format!( $( $t )* ).into());
         }
     }
 
+    #[cfg(not(target_arch = "wasm32"))]
+    macro_rules! log {
+        ( $( $t:tt )* ) => {
+            #[cfg(debug_assertions)]
+            println!( $( $t )* );
+        }
+    }
+
+    #[cfg(not(target_arch = "wasm32"))]
+    macro_rules! log_warn {
+        ( $( $t:tt )* ) => {
+            use crate::utils::get_current_page;
+            println!("Warning: {}, near {}", &format!( $( $t )* ), get_current_page());
+        }
+    }
+
     pub(crate) use log;
     pub(crate) use log_warn;
 }
@@ -177,7 +141,9 @@ pub fn set_current_page(page_name: String) {
     *current_page = Some(page_name.to_string());
 }
 
-pub fn get_current_page() -> Option<String> {
+pub fn get_current_page() -> String {
     let current_page = CURRENT_PAGE.lock().unwrap();
-    current_page.clone()
+    current_page
+        .clone()
+        .unwrap_or_else(|| String::from("[None]"))
 }
diff --git a/packages/onenote-converter/tests/convert.rs b/packages/onenote-converter/tests/convert.rs
new file mode 100644
index 0000000000..1233e411f5
--- /dev/null
+++ b/packages/onenote-converter/tests/convert.rs
@@ -0,0 +1,37 @@
+use onenote_converter::convert;
+use std::fs;
+use std::path::PathBuf;
+
+fn get_output_dir() -> PathBuf {
+    PathBuf::from("./test-output")
+}
+
+fn setup() {
+    let output_dir = get_output_dir();
+
+    if output_dir.exists() {
+        fs::remove_dir_all(&output_dir).unwrap();
+    }
+    fs::create_dir(&output_dir).unwrap();
+}
+
+#[test]
+fn convert_simple() {
+    setup();
+
+    let output_dir = get_output_dir();
+    convert(
+        "./assets/test-data/single-page/Untitled Section.one",
+        &output_dir.to_string_lossy(),
+        "./assets/test-data/single-page/",
+    )
+    .unwrap();
+
+    // Should create a table of contents file
+    assert!(output_dir.join("Untitled Section.html").exists());
+    // Should convert the input page to an HTML file
+    assert!(output_dir
+        .join("Untitled Section")
+        .join("test.html")
+        .exists());
+}