feat: debug text rendering of statistics, formatting with tests

tests/formatting.rs

@@ -0,0 +1,135 @@
+use pacman::systems::formatting::format_timing_display;
+use std::time::Duration;
+
+#[test]
+fn test_basic_formatting() {
+    let timing_data = vec![
+        ("60 FPS".to_string(), Duration::from_micros(1234), Duration::from_micros(567)),
+        ("input".to_string(), Duration::from_micros(123), Duration::from_micros(45)),
+        ("player".to_string(), Duration::from_micros(456), Duration::from_micros(123)),
+        ("movement".to_string(), Duration::from_micros(789), Duration::from_micros(234)),
+        ("render".to_string(), Duration::from_micros(12), Duration::from_micros(3)),
+        ("debug".to_string(), Duration::from_nanos(1000000), Duration::from_nanos(1000)),
+    ];
+
+    let result = format_timing_display(timing_data);
+    println!("Basic formatting test:");
+    println!("{}", result);
+    println!();
+}
+
+#[test]
+fn test_desired_format() {
+    // This test represents the exact format you want to achieve
+    let timing_data = vec![
+        ("total".to_string(), Duration::from_micros(1230), Duration::from_micros(570)),
+        ("input".to_string(), Duration::from_micros(120), Duration::from_micros(50)),
+        ("player".to_string(), Duration::from_micros(460), Duration::from_micros(120)),
+        ("movement".to_string(), Duration::from_micros(790), Duration::from_micros(230)),
+        ("render".to_string(), Duration::from_micros(10), Duration::from_micros(3)),
+        ("debug".to_string(), Duration::from_nanos(1000000), Duration::from_nanos(1000)),
+    ];
+
+    let result = format_timing_display(timing_data);
+    println!("Desired format test:");
+    println!("{}", result);
+    println!();
+
+    // Expected output should look like:
+    // total    :    1.23 ms ±    0.57 ms
+    // input    :    0.12 ms ±    0.05 ms
+    // player   :    0.46 ms ±    0.12 ms
+    // movement :    0.79 ms ±    0.23 ms
+    // render   :    0.01 ms ±    0.003ms
+    // debug    :    0.001ms ±    0.000ms
+}
+
+#[test]
+fn test_mixed_units() {
+    let timing_data = vec![
+        ("60 FPS".to_string(), Duration::from_millis(16), Duration::from_micros(500)),
+        (
+            "fast_system".to_string(),
+            Duration::from_nanos(500000),
+            Duration::from_nanos(100000),
+        ),
+        (
+            "medium_system".to_string(),
+            Duration::from_micros(2500),
+            Duration::from_micros(500),
+        ),
+        ("slow_system".to_string(), Duration::from_millis(5), Duration::from_millis(1)),
+    ];
+
+    let result = format_timing_display(timing_data);
+    println!("Mixed units test:");
+    println!("{}", result);
+    println!();
+}
+
+#[test]
+fn test_trailing_zeros() {
+    let timing_data = vec![
+        ("60 FPS".to_string(), Duration::from_micros(1000), Duration::from_micros(500)),
+        ("exact_ms".to_string(), Duration::from_millis(1), Duration::from_micros(100)),
+        ("exact_us".to_string(), Duration::from_micros(1), Duration::from_nanos(100000)),
+        ("exact_ns".to_string(), Duration::from_nanos(1000), Duration::from_nanos(100)),
+    ];
+
+    let result = format_timing_display(timing_data);
+    println!("Trailing zeros test:");
+    println!("{}", result);
+    println!();
+}
+
+#[test]
+fn test_edge_cases() {
+    let timing_data = vec![
+        ("60 FPS".to_string(), Duration::from_nanos(1), Duration::from_nanos(1)),
+        ("very_small".to_string(), Duration::from_nanos(100), Duration::from_nanos(50)),
+        ("very_large".to_string(), Duration::from_secs(1), Duration::from_millis(100)),
+        ("zero_time".to_string(), Duration::ZERO, Duration::ZERO),
+    ];
+
+    let result = format_timing_display(timing_data);
+    println!("Edge cases test:");
+    println!("{}", result);
+    println!();
+}
+
+#[test]
+fn test_variable_name_lengths() {
+    let timing_data = vec![
+        ("60 FPS".to_string(), Duration::from_micros(1234), Duration::from_micros(567)),
+        ("a".to_string(), Duration::from_micros(123), Duration::from_micros(45)),
+        (
+            "very_long_system_name".to_string(),
+            Duration::from_micros(456),
+            Duration::from_micros(123),
+        ),
+        ("medium".to_string(), Duration::from_micros(789), Duration::from_micros(234)),
+    ];
+
+    let result = format_timing_display(timing_data);
+    println!("Variable name lengths test:");
+    println!("{}", result);
+    println!();
+}
+
+#[test]
+fn test_empty_input() {
+    let timing_data = vec![];
+    let result = format_timing_display(timing_data);
+    assert_eq!(result, "");
+    println!("Empty input test: PASS");
+}
+
+#[test]
+fn test_single_entry() {
+    let timing_data = vec![("60 FPS".to_string(), Duration::from_micros(1234), Duration::from_micros(567))];
+
+    let result = format_timing_display(timing_data);
+    println!("Single entry test:");
+    println!("{}", result);
+    println!();
+}