diff --git a/src-tauri/src/epub.rs b/src-tauri/src/epub.rs
index 3ea01ec..ed2da57 100644
--- a/src-tauri/src/epub.rs
+++ b/src-tauri/src/epub.rs
@@ -97,68 +97,3 @@ pub fn unzip_epub(path: String) -> Result<Vec<EpubFile>, String> {
     let bytes = std::fs::read(&path).map_err(|e| format!("failed to read \"{path}\": {e}"))?;
     unzip(&bytes)
 }
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    fn text(path: &str, data: &str) -> EpubFile {
-        EpubFile {
-            path: path.into(),
-            data: data.into(),
-            encoding: "utf8".into(),
-        }
-    }
-
-    #[test]
-    fn round_trips_through_build_and_unzip() {
-        let png = STANDARD.encode([0x89, 0x50, 0x4e, 0x47]);
-        let input = vec![
-            text("mimetype", "application/epub+zip"),
-            text("META-INF/container.xml", "<container/>"),
-            text("OEBPS/chapter-1.xhtml", "<html>café</html>"),
-            EpubFile {
-                path: "OEBPS/assets/figure-1.png".into(),
-                data: png.clone(),
-                encoding: "base64".into(),
-            },
-        ];
-
-        let zipped = build(&input).expect("build");
-        let out = unzip(&zipped).expect("unzip");
-        let find = |p: &str| out.iter().find(|f| f.path == p).expect(p);
-
-        assert_eq!(find("mimetype").data, "application/epub+zip");
-        let chapter = find("OEBPS/chapter-1.xhtml");
-        assert_eq!(chapter.encoding, "utf8");
-        assert_eq!(chapter.data, "<html>café</html>");
-        let figure = find("OEBPS/assets/figure-1.png");
-        assert_eq!(figure.encoding, "base64");
-        assert_eq!(figure.data, png);
-        // Fonts are embedded by build() and must come back as base64 binary.
-        assert_eq!(find("OEBPS/fonts/Literata-VF.ttf").encoding, "base64");
-    }
-
-    #[test]
-    fn unzip_epub_reads_a_file_from_disk() {
-        let zipped = build(&[
-            text("mimetype", "application/epub+zip"),
-            text("OEBPS/chapter-1.xhtml", "<p>hi</p>"),
-        ])
-        .expect("build");
-
-        let mut path = std::env::temp_dir();
-        path.push("margin-unzip-test.epub");
-        std::fs::write(&path, &zipped).expect("write");
-
-        let out = unzip_epub(path.to_string_lossy().to_string()).expect("unzip_epub");
-        let _ = std::fs::remove_file(&path);
-
-        let chapter = out
-            .iter()
-            .find(|f| f.path == "OEBPS/chapter-1.xhtml")
-            .expect("chapter present");
-        assert_eq!(chapter.data, "<p>hi</p>");
-        assert_eq!(chapter.encoding, "utf8");
-    }
-}
diff --git a/src-tauri/src/pdf.rs b/src-tauri/src/pdf.rs
index 2032d05..9df94fb 100644
--- a/src-tauri/src/pdf.rs
+++ b/src-tauri/src/pdf.rs
@@ -65,53 +65,3 @@ fn format_source_diagnostics(diagnostics: &[SourceDiagnostic]) -> String {
         .collect::<Vec<_>>()
         .join("\n")
 }
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    // A faithful single-chapter preview source produced by chapterToPdfInputs
-    // (preamble #let macros + page numbering reset + opener + body).
-    const CHAPTER_PREVIEW: &str = r##"#set document(title: "The Lighthouse", author: "")
-#set page(
-  width: 6in + 0.125in,
-  height: 9in + 0.125in * 2,
-  margin: (inside: 0.875in, outside: 0.625in + 0.125in, top: 0.8in + 0.125in, bottom: 0.8in + 0.125in),
-  binding: left,
-)
-#set text(font: "Literata", size: 11pt, lang: "en", hyphenate: true)
-#set par(justify: true, leading: 0.72em, spacing: 0.72em, first-line-indent: (amount: 1.3em, all: false))
-#show heading: set text(font: "Literata", weight: "medium")
-#show heading.where(level: 1): set text(size: 22pt)
-
-#let scenebreak = align(center)[#v(0.5em) #line(length: 13%, stroke: 0.5pt + rgb("#d6cfbd")) #v(0.5em)]
-#let blockquote(body) = pad(left: 1.2em)[#set text(style: "italic", fill: rgb("#6b6458")); #body]
-#let chapteropener(num, title) = {
-  pagebreak(weak: true)
-  v(2.1in)
-  align(center)[
-    #text(font: "Hanken Grotesk", size: 8.5pt, weight: "semibold", tracking: 0.28em)[#upper("Chapter " + num)]
-    #v(0.7em)
-    #heading(level: 1, numbering: none, outlined: true)[#title]
-  ]
-  v(1.5em)
-}
-
-#set page(numbering: "1")
-#counter(page).update(1)
-
-#chapteropener("1", [The Lighthouse])
-
-The lamp had not been lit in thirty years.
-
-#scenebreak
-
-Morning came the color of pewter.
-"##;
-
-    #[test]
-    fn compiles_a_single_chapter_preview() {
-        let pdf = compile(CHAPTER_PREVIEW.to_string(), &[]).expect("chapter preview should compile");
-        assert!(pdf.starts_with(b"%PDF"), "output should be a PDF");
-    }
-}