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 +1,69 @@
+import XCTest
+import GRDB
+
+private struct TestError : Error { }
+
+class EnumeratedCursorTests: GRDBTestCase {
+    
+    func testEnumeratedCursorFromCursor() throws {
+        let base = AnyCursor(["foo", "bar"])
+        let cursor = base.enumerated()
+        var (n, x) = try cursor.next()!
+        XCTAssertEqual(x, "foo")
+        XCTAssertEqual(n, 0)
+        (n, x) = try cursor.next()!
+        XCTAssertEqual(x, "bar")
+        XCTAssertEqual(n, 1)
+        XCTAssertTrue(try cursor.next() == nil) // end
+        XCTAssertTrue(try cursor.next() == nil) // past the end
+    }
+    
+    func testEnumeratedCursorForEach() throws {
+        // Test that enumerated().forEach() calls base.forEach().
+        // This is important in order to prevent
+        // <https://github.com/groue/GRDB.swift/issues/1124>
+        class TestCursor: Cursor {
+            func next() -> String? {
+                fatalError("Must not be called during forEach")
+            }
+            
+            func forEach(_ body: (String) throws -> Void) throws {
+                try body("foo")
+                try body("bar")
+            }
+        }
+        
+        let base = TestCursor()
+        let cursor = base.enumerated()
+        let elements = try Array(cursor)
+        XCTAssertEqual(elements.count, 2)
+        XCTAssertEqual(elements[0].0, 0)
+        XCTAssertEqual(elements[0].1, "foo")
+        XCTAssertEqual(elements[1].0, 1)
+        XCTAssertEqual(elements[1].1, "bar")
+    }
+    
+    func testEnumeratedCursorFromThrowingCursor() throws {
+        var i = 0
+        let strings = ["foo", "bar"]
+        let base: AnyCursor<String> = AnyCursor {
+            guard i < strings.count else { throw TestError() }
+            defer { i += 1 }
+            return strings[i]
+        }
+        let cursor = base.enumerated()
+        var (n, x) = try cursor.next()!
+        XCTAssertEqual(x, "foo")
+        XCTAssertEqual(n, 0)
+        (n, x) = try cursor.next()!
+        XCTAssertEqual(x, "bar")
+        XCTAssertEqual(n, 1)
+        do {
+            _ = try cursor.next()
+            XCTFail()
+        } catch is TestError {
+        } catch {
+            XCTFail()
+        }
+    }
+}