1 files changed, 75 insertions, 1 deletions

diff --git a/gui/tests/layout.rs b/gui/tests/layout.rs
index e0c0475..ab5a62e 100644
--- a/gui/tests/layout.rs
+++ b/gui/tests/layout.rs
@@ -4,8 +4,9 @@
 
 use std::f32::consts::TAU;
 
+use eframe::egui::{Pos2, Rect, pos2, vec2};
 use zagan_bet::roulette::{BetTarget, Outside};
-use zagan_bet_gui::roulette::{number_under, size_for, target_name};
+use zagan_bet_gui::roulette::{Felt, number_under, size_for, target_name};
 use zagan_bet_gui::theme::{group_digits, money};
 
 #[test]
@@ -49,6 +50,79 @@ fn table_size_keeps_the_felt_aspect_and_fits() {
     assert!((cell - (size.y - 12.0) / 4.89).abs() < 0.01);
 }
 
+fn felt() -> Felt {
+    Felt::new(Rect::from_min_size(
+        Pos2::ZERO,
+        size_for(vec2(1300.0, 900.0)),
+    ))
+}
+
+#[test]
+fn the_pointer_snaps_to_straights_splits_and_corners() {
+    let felt = felt();
+    let cell = felt.cell_size();
+    let center = felt.number_rect(17).center();
+
+    // The inner half of a cell is a straight, even slightly off centre.
+    assert_eq!(
+        felt.target_at(center + vec2(cell * 0.2, 0.0)),
+        Some(BetTarget::Straight { number: 17 })
+    );
+
+    // A quarter cell from the centre is the line: right of 17 is 20, above is 18.
+    assert_eq!(
+        felt.target_at(center + vec2(cell * 0.3, 0.0)),
+        Some(BetTarget::Split { a: 17, b: 20 })
+    );
+    assert_eq!(
+        felt.target_at(center + vec2(0.0, -cell * 0.3)),
+        Some(BetTarget::Split { a: 17, b: 18 })
+    );
+
+    // Near both lines at once is the corner of the four cells.
+    assert_eq!(
+        felt.target_at(center + vec2(cell * 0.3, -cell * 0.3)),
+        Some(BetTarget::Corner {
+            numbers: [17, 18, 20, 21]
+        })
+    );
+
+    // Zero is a straight and nothing else.
+    assert_eq!(
+        felt.target_at(felt.number_rect(0).center()),
+        Some(BetTarget::Straight { number: 0 })
+    );
+}
+
+#[test]
+fn the_pointer_finds_the_wide_bets_below_the_grid() {
+    let felt = felt();
+    let cell = felt.cell_size();
+    let x = felt.number_rect(17).center().x;
+    let grid_bottom = felt.number_rect(16).bottom();
+
+    // 17 sits in the second dozen (13-24).
+    assert_eq!(
+        felt.target_at(pos2(x, grid_bottom + cell * 0.3)),
+        Some(BetTarget::Dozen { index: 1 })
+    );
+
+    // Below the dozens is the column row; 17 is in column 2 (2,5,...,17).
+    assert_eq!(
+        felt.target_at(pos2(x, grid_bottom + cell * (0.72 + 0.3))),
+        Some(BetTarget::Column { index: 1 })
+    );
+
+    // And below that, the outside row: 17's column lands on RED.
+    assert_eq!(
+        felt.target_at(pos2(x, grid_bottom + cell * (0.72 + 0.55 + 0.3))),
+        Some(BetTarget::Outside { kind: Outside::Red })
+    );
+
+    // Outside the board is not a bet.
+    assert_eq!(felt.target_at(pos2(-1.0, -1.0)), None);
+}
+
 #[test]
 fn targets_read_as_bet_slips() {
     assert_eq!(