feat: add new dependencies and integration tests for markdown and text formats

tests/fixtures/example.rs

@@ -0,0 +1,4 @@
+// This is a sample Rust file for testing purposes.
+fn main() {
+    println!("Hello, world!");
+}

tests/fixtures/example.txt

@@ -0,0 +1 @@
+Example text file content

tests/integration_tests.rs

@@ -0,0 +1,79 @@
+use codebase_to_prompt::{Config, Format, run};
+use std::fs;
+use std::path::PathBuf;
+
+#[test]
+fn test_run_with_markdown_format() {
+    let temp_dir = tempfile::tempdir().unwrap();
+    let output_file = temp_dir.path().join("output.md");
+
+    let config = Config {
+        directory: PathBuf::from("tests/fixtures"),
+        output: Some(output_file.clone()),
+        include: vec!["rs".to_string()],
+        exclude: vec![],
+        format: Format::Markdown,
+        append_date: false,
+        append_git_hash: false,
+        line_numbers: false,
+        ignore_hidden: true,
+        respect_gitignore: true,
+    };
+
+    let result = run(config);
+    assert!(result.is_ok());
+
+    let output_content = fs::read_to_string(output_file).unwrap();
+    assert!(output_content.contains("### `example.rs`"));
+}
+
+#[test]
+fn test_run_with_text_format() {
+    let temp_dir = tempfile::tempdir().unwrap();
+    let output_file = temp_dir.path().join("output.txt");
+
+    let config = Config {
+        directory: PathBuf::from("tests/fixtures"),
+        output: Some(output_file.clone()),
+        include: vec!["txt".to_string()],
+        exclude: vec![],
+        format: Format::Text,
+        append_date: false,
+        append_git_hash: false,
+        line_numbers: true,
+        ignore_hidden: true,
+        respect_gitignore: true,
+    };
+
+    let result = run(config);
+    assert!(result.is_ok());
+
+    let output_content = fs::read_to_string(output_file).unwrap();
+    assert!(output_content.contains("1 | Example text file content"));
+}
+
+#[test]
+fn test_run_with_git_hash_append() {
+    let temp_dir = tempfile::tempdir().unwrap();
+    let output_file = temp_dir.path().join("output.txt");
+
+    let config = Config {
+        directory: PathBuf::from("tests/fixtures"),
+        output: Some(output_file.clone()),
+        include: vec!["txt".to_string()],
+        exclude: vec![],
+        format: Format::Text,
+        append_date: false,
+        append_git_hash: true,
+        line_numbers: false,
+        ignore_hidden: true,
+        respect_gitignore: true,
+    };
+
+    let result = run(config);
+    assert!(result.is_ok());
+
+    let output_file_name = output_file.file_name().unwrap().to_str().unwrap();
+    assert!(output_file_name.contains("output"));
+    assert!(output_file_name.len() > "output".len());
+}