Deprecate AtomTestContext.onUpdate

Author: ra1028

Sources/Atoms/Context/AtomTestContext.swift

@@ -18,13 +18,6 @@ public struct AtomTestContext: AtomWatchableContext {
         location = SourceLocation(fileID: fileID, line: line)
     }
 
-    /// A callback to perform when any of the atoms watched by this context is updated.
-    @inlinable
-    public var onUpdate: (() -> Void)? {
-        get { _state.onUpdate }
-        nonmutating set { _state.onUpdate = newValue }
-    }
-
     /// Waits until any of the atoms watched through this context have been updated up to the
     /// specified timeout, and then returns a boolean value indicating whether an update has happened.
     ///

Sources/Atoms/Deprecated.swift

@@ -43,3 +43,11 @@ public extension AtomScope {
         scopedOverride(atomType, with: value)
     }
 }
+
+public extension AtomTestContext {
+    @available(*, deprecated, message: "Use `waitForUpdate(timeout:)` or `wait(for:timeout:until:)` instead")
+    var onUpdate: (() -> Void)? {
+        get { _state.onUpdate }
+        nonmutating set { _state.onUpdate = newValue }
+    }
+}