From f610726fdeee1cd33aad675033e0c6d935c3c74c Mon Sep 17 00:00:00 2001
From: A Farzat <a@farzat.xyz>
Date: Fri, 5 Jun 2026 16:45:25 +0300
Subject: Test single file rendering in Renderer

---
 src/renderer.rs | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/src/renderer.rs b/src/renderer.rs
index 23b5cf3..88f3623 100644
--- a/src/renderer.rs
+++ b/src/renderer.rs
@@ -1,6 +1,6 @@
 use std::{
     fmt,
-    io::Write,
+    io::{Read, Write},
     path::{Path, PathBuf},
 };
 
@@ -33,6 +33,18 @@ impl<W: Write> Renderer<W> {
     pub fn render_header(&mut self, project_name: &str) -> std::io::Result<()> {
         writeln!(self.output, "# {}", project_name)
     }
+
+    pub fn render_file<R: Read>(&mut self, filename: &Path, mut reader: R) -> std::io::Result<()> {
+        let mut buf = String::new();
+        reader.read_to_string(&mut buf)?;
+        let name = render_filename(filename);
+        let fence = outer_backticks(&buf);
+        writeln!(self.output)?;
+        writeln!(self.output, "## File: {}", name)?;
+        writeln!(self.output, "{}", fence)?;
+        writeln!(self.output, "{}", buf)?;
+        writeln!(self.output, "{}", fence)
+    }
 }
 
 pub fn render(project_name: &str, files: &[(&Path, &[u8])]) -> Result<String, RenderError> {
@@ -77,7 +89,7 @@ fn render_filename(path: &Path) -> String {
 
 #[cfg(test)]
 mod tests {
-    use std::{ffi::OsStr, os::unix::ffi::OsStrExt, path::Path};
+    use std::{ffi::OsStr, io::Cursor, os::unix::ffi::OsStrExt, path::Path};
 
     use super::{RenderError, Renderer, render};
 
@@ -184,4 +196,16 @@ mod tests {
 
         assert_eq!(String::from_utf8(output).unwrap(), "# Project name\n");
     }
+
+    #[test]
+    fn renderer_renders_single_file() {
+        let mut output = Vec::new();
+        let mut renderer = Renderer::new(&mut output);
+
+        let input = Cursor::new("fn main() {}");
+        renderer.render_file(Path::new("main.rs"), input).unwrap();
+        let expected = "\n## File: main.rs\n```\nfn main() {}\n```\n";
+
+        assert_eq!(String::from_utf8(output).unwrap(), expected);
+    }
 }
-- 
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