add swiftUI code

2025-01-22 14:09:10 +08:00
parent 68e7b7347c
commit 8a99853829
2531 changed files with 486215 additions and 0 deletions
@@ -0,0 +1,54 @@
+import XCTest
+import GRDB
+
+private struct TestError : Error { }
+
+class MapCursorTests: GRDBTestCase {
+    
+    func testMap() {
+        let base = AnyCursor([1, 2])
+        let cursor = base.map { $0 * $0 }
+        XCTAssertEqual(try cursor.next()!, 1)
+        XCTAssertEqual(try cursor.next()!, 4)
+        XCTAssertTrue(try cursor.next() == nil)
+    }
+    
+    func testMapCursorForEach() throws {
+        // Test that map().forEach() calls base.forEach().
+        // This is important in order to prevent
+        // <https://github.com/groue/GRDB.swift/issues/1124>
+        class TestCursor: Cursor {
+            func next() -> Int? {
+                fatalError("Must not be called during forEach")
+            }
+            
+            func forEach(_ body: (Int) throws -> Void) throws {
+                try body(1)
+                try body(2)
+            }
+        }
+        
+        let base = TestCursor()
+        let cursor = base.map { $0 * $0 }
+        try XCTAssertEqual(Array(cursor), [1, 4])
+    }
+    
+    func testMapThrowingCursor() {
+        var i = 0
+        let base: AnyCursor<Int> = AnyCursor {
+            guard i < 1 else { throw TestError() }
+            defer { i += 1 }
+            return i
+        }
+        let cursor = base.map { $0 + 1 }
+        XCTAssertEqual(try cursor.next()!, 1)
+        do {
+            _ = try cursor.next()
+            XCTFail()
+        } catch is TestError {
+        } catch {
+            XCTFail()
+        }
+    }
+    
+}