feat: module application avec render_service et file_service

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src-tauri/src/application/render_service.rs

@@ -0,0 +1,60 @@
+use crate::domain::MarkdownRenderer;
+use crate::infrastructure::file_repository;
+
+#[allow(dead_code)]
+pub fn render_string(renderer: &dyn MarkdownRenderer, content: &str) -> String {
+    renderer.render(content)
+}
+
+#[allow(dead_code)]
+pub fn render_file(renderer: &dyn MarkdownRenderer, path: &str) -> Result<String, String> {
+    let content = file_repository::read_file(path)?;
+    Ok(renderer.render(&content))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::fs;
+
+    struct MockRenderer;
+
+    impl MarkdownRenderer for MockRenderer {
+        fn render(&self, content: &str) -> String {
+            format!("<mock>{content}</mock>")
+        }
+    }
+
+    #[test]
+    fn render_string_delegates_to_renderer() {
+        let renderer = MockRenderer;
+        let result = render_string(&renderer, "hello");
+        assert_eq!(result, "<mock>hello</mock>");
+    }
+
+    #[test]
+    fn render_string_empty_content() {
+        let renderer = MockRenderer;
+        let result = render_string(&renderer, "");
+        assert_eq!(result, "<mock></mock>");
+    }
+
+    #[test]
+    fn render_file_success() {
+        let dir = std::env::temp_dir().join("pena_rs_render_file");
+        fs::create_dir_all(&dir).unwrap();
+        let file = dir.join("test.md");
+        fs::write(&file, "world").unwrap();
+        let renderer = MockRenderer;
+        let result = render_file(&renderer, file.to_str().unwrap());
+        fs::remove_dir_all(&dir).unwrap();
+        assert_eq!(result.unwrap(), "<mock>world</mock>");
+    }
+
+    #[test]
+    fn render_file_not_found() {
+        let renderer = MockRenderer;
+        let result = render_file(&renderer, "/nonexistent/pena_rs_file.md");
+        assert!(result.is_err());
+    }
+}