1 files changed, 82 insertions, 0 deletions

diff --git a/gui/tests/layout.rs b/gui/tests/layout.rs
new file mode 100644
index 0000000..e0c0475
--- /dev/null
+++ b/gui/tests/layout.rs
@@ -0,0 +1,82 @@
+//! Pure presentation maths. Anything that touches a `Ui` is covered by the
+//! manual screenshot pass; these are the calculations a pixel test cannot
+//! express.
+
+use std::f32::consts::TAU;
+
+use zagan_bet::roulette::{BetTarget, Outside};
+use zagan_bet_gui::roulette::{number_under, size_for, target_name};
+use zagan_bet_gui::theme::{group_digits, money};
+
+#[test]
+fn money_is_grouped_in_threes() {
+    assert_eq!(group_digits(0), "0");
+    assert_eq!(group_digits(999), "999");
+    assert_eq!(group_digits(1000), "1 000");
+    assert_eq!(group_digits(1234567), "1 234 567");
+    assert_eq!(group_digits(-1500), "-1 500");
+    assert_eq!(money(1000), "1 000 Kr");
+}
+
+#[test]
+fn the_wheel_pointer_reads_the_number_at_the_top() {
+    let segment = TAU / 37.0;
+    assert_eq!(number_under(0.0), 0);
+
+    // Rotating by -i segments puts wheel entry i under the pointer.
+    for number in [0u8, 32, 17, 26] {
+        let index = zagan_bet::roulette::WHEEL
+            .iter()
+            .position(|candidate| *candidate == number)
+            .expect("number is on the wheel");
+        let rotation = -(index as f32) * segment;
+        assert_eq!(number_under(rotation), number);
+    }
+
+    // One full turn changes nothing.
+    assert_eq!(number_under(-TAU), 0);
+}
+
+#[test]
+fn table_size_keeps_the_felt_aspect_and_fits() {
+    let available = eframe::egui::vec2(1300.0, 900.0);
+    let size = size_for(available);
+    assert!(size.x <= available.x + 0.01, "{size:?} overflows");
+    assert!(size.y <= available.y + 0.01, "{size:?} overflows");
+
+    // 13 cells wide and 4.89 cells tall, plus the felt border on every side.
+    let cell = (size.x - 12.0) / 13.0;
+    assert!((cell - (size.y - 12.0) / 4.89).abs() < 0.01);
+}
+
+#[test]
+fn targets_read_as_bet_slips() {
+    assert_eq!(
+        target_name(&BetTarget::Straight { number: 17 }),
+        "Straight 17"
+    );
+    assert_eq!(
+        target_name(&BetTarget::Split { a: 26, b: 29 }),
+        "Split 26/29"
+    );
+    assert_eq!(
+        target_name(&BetTarget::Corner {
+            numbers: [17, 18, 20, 21]
+        }),
+        "Corner 17/18/20/21"
+    );
+    assert_eq!(target_name(&BetTarget::Dozen { index: 1 }), "2nd 12");
+    assert_eq!(target_name(&BetTarget::Column { index: 2 }), "Column 3");
+    assert_eq!(
+        target_name(&BetTarget::Outside {
+            kind: Outside::High
+        }),
+        "19-36"
+    );
+    assert_eq!(
+        target_name(&BetTarget::Outside {
+            kind: Outside::Black
+        }),
+        "Black"
+    );
+}