0.10.6

Tests/ChatScrollPositionPolicyTests.swift

@@ -0,0 +1,29 @@
+import XCTest
+@testable import Luma
+
+final class ChatScrollPositionPolicyTests: XCTestCase {
+    func testBottomSentinelCrossesOnlyTheTelegramButtonThreshold() {
+        XCTAssertTrue(ChatScrollPositionPolicy.isNearBottom(
+            bottomY: 796,
+            viewportHeight: 700
+        ))
+        XCTAssertFalse(ChatScrollPositionPolicy.isNearBottom(
+            bottomY: 797,
+            viewportHeight: 700
+        ))
+    }
+
+    func testInvalidFirstLayoutDoesNotFlashTheButton() {
+        XCTAssertTrue(ChatScrollPositionPolicy.isNearBottom(
+            bottomY: 0,
+            viewportHeight: 0
+        ))
+    }
+
+    func testNativeScrollDistanceCanHideAndRestoreButtonRepeatedly() {
+        XCTAssertFalse(ChatScrollPositionPolicy.isNearBottom(distanceFromBottom: 180))
+        XCTAssertTrue(ChatScrollPositionPolicy.isNearBottom(distanceFromBottom: 0))
+        XCTAssertFalse(ChatScrollPositionPolicy.isNearBottom(distanceFromBottom: 220))
+        XCTAssertTrue(ChatScrollPositionPolicy.isNearBottom(distanceFromBottom: -12))
+    }
+}