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 +1,76 @@
+import XCTest
+import GRDB
+
+class ValueObservationReadonlyTests: GRDBTestCase {
+    
+    func testReadOnlyObservation() throws {
+        try assertValueObservation(
+            ValueObservation.trackingConstantRegion {
+                try Int.fetchOne($0, sql: "SELECT COUNT(*) FROM t")!
+            },
+            records: [0, 1],
+            setup: { db in
+                try db.execute(sql: "CREATE TABLE t(id INTEGER PRIMARY KEY AUTOINCREMENT)")
+        },
+            recordedUpdates: { db in
+                try db.execute(sql: "INSERT INTO t DEFAULT VALUES")
+        })
+    }
+    
+    func testWriteObservationFailsByDefaultWithErrorHandling() throws {
+        try assertValueObservation(
+            ValueObservation.trackingConstantRegion { db -> Int in
+                try db.execute(sql: "INSERT INTO t DEFAULT VALUES")
+                return 0
+            },
+            fails: { (error: DatabaseError, _: DatabaseWriter) in
+                XCTAssertEqual(error.resultCode, .SQLITE_READONLY)
+                XCTAssertEqual(error.message, "attempt to write a readonly database")
+                XCTAssertEqual(error.sql!, "INSERT INTO t DEFAULT VALUES")
+                XCTAssertEqual(error.description, "SQLite error 8: attempt to write a readonly database - while executing `INSERT INTO t DEFAULT VALUES`")
+        },
+            setup: { db in
+                try db.execute(sql: "CREATE TABLE t(id INTEGER PRIMARY KEY AUTOINCREMENT)")
+        })
+    }
+    
+    func testWriteObservation() throws {
+        var observation = ValueObservation.trackingConstantRegion { db -> Int in
+            XCTAssert(db.isInsideTransaction, "expected a wrapping transaction")
+            try db.execute(sql: "CREATE TEMPORARY TABLE temp AS SELECT * FROM t")
+            let result = try Int.fetchOne(db, sql: "SELECT COUNT(*) FROM temp")!
+            try db.execute(sql: "DROP TABLE temp")
+            return result
+        }
+        observation.requiresWriteAccess = true
+        
+        try assertValueObservation(
+            observation,
+            records: [0, 1],
+            setup: { db in
+                try db.execute(sql: "CREATE TABLE t(id INTEGER PRIMARY KEY AUTOINCREMENT)")
+        },
+            recordedUpdates: { db in
+                try db.execute(sql: "INSERT INTO t DEFAULT VALUES")
+        })
+    }
+    
+    func testWriteObservationIsWrappedInSavepointWithErrorHandling() throws {
+        struct TestError: Error { }
+        var observation = ValueObservation.trackingConstantRegion { db in
+            try db.execute(sql: "INSERT INTO t DEFAULT VALUES")
+            throw TestError()
+        }
+        observation.requiresWriteAccess = true
+        
+        try assertValueObservation(
+            observation,
+            fails: { (_: TestError, writer: DatabaseWriter) in
+                let count = try writer.read(Table("t").fetchCount)
+                XCTAssertEqual(count, 0)
+        },
+            setup: { db in
+                try db.execute(sql: "CREATE TABLE t(id INTEGER PRIMARY KEY AUTOINCREMENT)")
+        })
+    }
+}