Integration testing

src/lib.rs

@@ -69,4 +69,44 @@ pub fn search(config: Config, file_content: String) -> Result<Vec<String>, &'sta
     Ok(str_result)
 }
 
+#[cfg(test)]
+mod tests {
 
+    use super::*;
+
+    fn run_search(args: Vec<String>) -> Vec<String> {
+        let config = Config::build(args).unwrap();
+
+        let file_content = std::fs::read_to_string(&config.file_path)
+            .expect("Failed to read file");
+
+        let result = search(config, file_content).unwrap();
+        assert!(!result.is_empty(), "Expected matches but found none!");
+        result
+    }
+
+    #[test]
+    fn test_search() {
+        let args: Vec<String> = vec!["target/debug/m-grep", "Who", "poem.txt"]
+            .iter().map(|&x| x.into()).collect();
+        
+        let result = run_search(args);
+
+        for line in result {
+            println!("{line}");
+            assert_eq!(line, format!("I'm nobody! {} are you?", "Who".green()));
+        }
+    }
+
+    #[test]
+    fn test_search_ignorecase() {
+        let args: Vec<String> = vec!["target/debug/m-grep", "who", "poem.txt", "-i"]
+            .iter().map(|&x| x.into()).collect();
+        
+        let result = run_search(args);
+
+        for line in result {
+            assert_eq!(line, format!("I'm nobody! {} are you?", "Who".green()));
+        }
+    }
+}

src/main.rs

@@ -1,12 +1,11 @@
 use colored::Colorize;
-use std::io::Read;
 use std::process;
 
 use m_grep::{Config, search};
 
 fn main() {
     let args: Vec<String> = std::env::args().collect();
-
+    
     if let Err(err) = run(args) {
         eprintln!("{}: {}", "Error".red().bold(), err.to_string().red());
         process::exit(1);
@@ -16,16 +15,13 @@ fn main() {
 fn run(args: Vec<String>) -> Result<(), Box<dyn std::error::Error>> {
     let config = Config::build(args)?;
     let file_path = &config.file_path;
-    
+
     if !std::path::Path::new(&file_path).exists() {
         return Err("File not exists!".into());
     }
 
-    let mut file = std::fs::File::open(file_path).map_err(|_| "Failed to open file")?;
-    let mut file_content = String::new();
-
-    file.read_to_string(&mut file_content)
-        .map_err(|_| "Failed to read file")?;
+    let file_content = std::fs::read_to_string(file_path)
+        .expect("Failed to read file");
 
     let result = search(config, file_content)?;