feat: remove [] ending, cleanup code and add test cases

Author: Curstantine

src/challenge/challenge_01.rs

@@ -16,9 +16,7 @@ pub fn run(input: &str, output: Option<&str>) -> Result<String> {
     if let Some(output) = output.map(split_whitespace_and_parse::<u16>).transpose()? {
         anyhow::ensure!(
             result == output,
-            "Output vector does not match expected: got '{:?}' expected '{:?}'",
-            result,
-            output
+            "Output vector does not match expected: got '{result:?}' expected '{output:?}'",
         );
 
         return Ok(format!(

src/challenge/challenge_03.rs

@@ -13,9 +13,9 @@ pub fn run(input: &str, output: Option<&str>) -> Result<String> {
     let result = fair_bandwidth_allocation(users, total);
 
     if let Some(output) = output {
-        if output == "[]" {
+        if output.is_empty() {
             anyhow::ensure!(
-                users == 0 && result.is_empty(),
+                result.is_empty(),
                 "Output does not match expected for 0 users"
             );
         }
@@ -27,9 +27,7 @@ pub fn run(input: &str, output: Option<&str>) -> Result<String> {
                     .iter()
                     .zip(expected_output.iter())
                     .all(|(a, b)| (a - b).abs() < 1e-6),
-            "Output vector does not match expected: got '{:?}' expected '{:?}'",
-            result,
-            expected_output
+            "Output vector does not match expected: got '{result:?}' expected '{expected_output:?}'"
         );
 
         return Ok(format!(
@@ -38,18 +36,9 @@ pub fn run(input: &str, output: Option<&str>) -> Result<String> {
         ));
     }
 
-    let result_str = if result.is_empty() {
-        "[]"
-    } else {
-        &result
-            .iter()
-            .map(|&b| format!("{b:.6}"))
-            .collect::<Vec<String>>()
-            .join(" ")
-    };
-
     Ok(format!(
-        "Calculated allocations: {result_str}, but {} output!",
+        "Calculated allocations: {}, but {} output!",
+        &result.preview(15),
         "missing".red().bold()
     ))
 }

testcases/03/01_input.txt

@@ -0,0 +1 @@
+10 5.0

testcases/03/01_output.txt

@@ -0,0 +1 @@
+0.500000 0.500000 0.500000 0.500000 0.500000 0.500000 0.500000 0.500000 0.500000 0.500000

testcases/03/02_input.txt

@@ -0,0 +1 @@
+10 0.5

testcases/03/02_output.txt

@@ -0,0 +1 @@
+0.100000 0.100000 0.100000 0.100000 0.100000

testcases/03/03_input.txt

@@ -0,0 +1 @@
+5 0.5

testcases/03/03_output.txt

@@ -0,0 +1 @@
+0.100000 0.100000 0.100000 0.100000 0.100000

testcases/03/04_input.txt

@@ -0,0 +1 @@
+0 100