feat: add test cases for challenge 2

Author: Curstantine

src/challenge/challenge_02.rs

@@ -2,7 +2,7 @@
 use anyhow::Result;
 use colored::Colorize;
 
-use crate::utils::split_whitespace_and_parse;
+use crate::utils::{VecPreview, split_whitespace_and_parse};
 
 pub fn run(input: &str, output: Option<&str>) -> Result<String> {
     let mut lines = input.lines();
@@ -21,7 +21,10 @@ pub fn run(input: &str, output: Option<&str>) -> Result<String> {
             output
         );
 
-        return Ok(format!("Result matches the specified output: {output:#?}"));
+        return Ok(format!(
+            "Result matches the specified output: {}",
+            result.preview(15)
+        ));
     }
 
     Ok(format!(

src/utils.rs

@@ -1,3 +1,4 @@
+use std::fmt::Write;
 use std::str::FromStr;
 
 pub fn split_whitespace_and_parse<T: FromStr + Sized>(source: &str) -> Result<Vec<T>, T::Err> {
@@ -6,3 +7,27 @@ pub fn split_whitespace_and_parse<T: FromStr + Sized>(source: &str) -> Result<Ve
         .map(|x| x.parse::<T>())
         .collect::<Result<Vec<T>, T::Err>>()
 }
+
+pub trait VecPreview<T> {
+    fn preview(&self, count: usize) -> String;
+}
+
+impl<T: std::fmt::Display + std::fmt::Debug> VecPreview<T> for [T] {
+    fn preview(&self, count: usize) -> String {
+        if self.len() <= count {
+            return format!("{:?}", self);
+        }
+
+        let mut s = String::from("[");
+        for (i, item) in self.iter().take(count).enumerate() {
+            if i > 0 {
+                s.push_str(", ");
+            }
+
+            write!(&mut s, "{}", item).unwrap();
+        }
+
+        s.push_str(&format!(", ... ({} total)]", self.len()));
+        s
+    }
+}

testcases/02/02_input.txt

@@ -0,0 +1,2 @@
+3
+22 21 20

testcases/02/02_output.txt

@@ -0,0 +1 @@
+0 0 0

testcases/02/03_input.txt

@@ -0,0 +1,2 @@
+5
+1 2 3 4 5

testcases/02/03_output.txt

@@ -0,0 +1 @@
+1 1 1 1 0

testcases/02/04_input.txt

@@ -0,0 +1,2 @@
+4
+10 10 10 10

testcases/02/04_output.txt

@@ -0,0 +1 @@
+0 0 0 0

testcases/02/05_input.txt

@@ -0,0 +1,2 @@
+6
+5 10 5 10 5 10

testcases/02/05_output.txt

@@ -0,0 +1 @@
+1 0 1 0 1 0