Settings: price display toggle — station sign (£129.9) vs pounds & pence (£1.299); display-only, all surfaces (list, widgets, Live Activity, Siri cards); Siri dialog stays speech-safe pounds

FuelBoardTests/Tests/FuelBoardSharedTests/FuelBoardTests.swift

@@ -561,3 +561,26 @@ final class SiriCheapestLookupTests: XCTestCase {
         XCTAssertTrue(label.hasPrefix("as of "), "plain ISO 8601 still parses")
     }
 }
+
+// MARK: - Price display style
+
+final class PriceDisplayTests: XCTestCase {
+    func testStationSignStyle() {
+        XCTAssertEqual(FuelStore.priceText(129.9, style: .stationSign), "£129.9")
+        XCTAssertEqual(FuelStore.priceText(135.0, style: .stationSign), "£135.0")
+        XCTAssertEqual(FuelStore.priceText(249.9, style: .stationSign), "£249.9")
+    }
+
+    func testPoundsPenceStyle() {
+        XCTAssertEqual(FuelStore.priceText(129.9, style: .poundsPence), "£1.299")
+        XCTAssertEqual(FuelStore.priceText(135.0, style: .poundsPence), "£1.350")
+        XCTAssertEqual(FuelStore.priceText(100.9, style: .poundsPence), "£1.009")
+    }
+
+    func testSpokenAlwaysPounds() {
+        // Siri would read "£129.9" as "one hundred and twenty-nine pounds" —
+        // the spoken form must always be pounds regardless of display style.
+        XCTAssertEqual(FuelStore.priceTextSpoken(129.9), "£1.299")
+        XCTAssertEqual(FuelStore.priceTextSpoken(100.9), "£1.009")
+    }
+}