test: tidy examples and integration tests

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Author: mrchypark

examples/test_tokens_debug.rs

@@ -5,16 +5,13 @@ fn main() {
     println!("Input: {}", input);
 
     let mut lexer = Lexer::new(input.to_string());
-    let mut tokens = Vec::new();
-
     loop {
         match lexer.next_token() {
             Ok(token) => {
                 println!("Token: {:?}", token);
                 if token == libdplyr::lexer::Token::EOF {
                     break;
                 }
-                tokens.push(token);
             }
             Err(e) => {
                 println!("Error: {:?}", e);

tests/cli_integration_tests.rs

@@ -278,8 +278,10 @@ fn test_pretty_formatting() {
     let stdout = String::from_utf8(output.stdout).expect("Invalid UTF-8");
 
     // Pretty format should have multiple lines with proper indentation
-    let lines: Vec<&str> = stdout.lines().collect();
-    assert!(lines.len() > 1, "Pretty format should have multiple lines");
+    assert!(
+        stdout.lines().count() > 1,
+        "Pretty format should have multiple lines"
+    );
     assert!(stdout.contains("SELECT"), "Should contain SELECT");
     assert!(stdout.contains("FROM"), "Should contain FROM");
     assert!(stdout.contains("WHERE"), "Should contain WHERE");

tests/json_output_tests.rs

@@ -17,7 +17,7 @@ fn test_json_output_integration() {
         .build();
 
     // Test successful output
-    let result = formatter.format_success("SELECT \"name\" FROM \"data\"", metadata.clone());
+    let result = formatter.format_success("SELECT \"name\" FROM \"data\"", metadata);
     assert!(result.is_ok());
 
     let json = result.unwrap();