Fixed Core Data test cases problem in multithreading condition.

Author: wolfcon

MJExtension.xcodeproj/xcshareddata/xcschemes/MJExtensionDemo.xcscheme

@@ -60,6 +60,33 @@
             ReferencedContainer = "container:MJExtension.xcodeproj">
          </BuildableReference>
       </BuildableProductRunnable>
+      <CommandLineArguments>
+         <CommandLineArgument
+            argument = "-com.apple.CoreData.SQLDebug 4"
+            isEnabled = "YES">
+         </CommandLineArgument>
+         <CommandLineArgument
+            argument = "-com.apple.CoreData.ConcurrencyDebug 1"
+            isEnabled = "YES">
+         </CommandLineArgument>
+      </CommandLineArguments>
+      <EnvironmentVariables>
+         <EnvironmentVariable
+            key = "SQLITE_AUTO_TRACE"
+            value = "1"
+            isEnabled = "NO">
+         </EnvironmentVariable>
+         <EnvironmentVariable
+            key = "SQLITE_ENABLE_FILE_ASSERSIONS"
+            value = "1"
+            isEnabled = "YES">
+         </EnvironmentVariable>
+         <EnvironmentVariable
+            key = "SQLITE_ENABLE_THREAD_ASSERTIONS"
+            value = "1"
+            isEnabled = "YES">
+         </EnvironmentVariable>
+      </EnvironmentVariables>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"

MJExtensionTests/CoreDataTests.swift

@@ -17,10 +17,8 @@ class CoreDataTests: XCTestCase {
         try super.setUpWithError()
 
         let container = NSPersistentContainer(name: "MJCoreDataTestModel")
-        let description = NSPersistentStoreDescription()
-        description.url = URL(fileURLWithPath: "/dev/null")
-        
-        container.persistentStoreDescriptions = [description]
+        // Test in memory. This is important.
+        container.persistentStoreDescriptions.first?.url = URL(fileURLWithPath: "/dev/null")
         container.loadPersistentStores { description, error in
             XCTAssertNil(error)
         }
@@ -56,19 +54,22 @@ class CoreDataTests: XCTestCase {
         coreDataObject2JSON()
     }
 
-    func json2CoreDataObject() {
+func json2CoreDataObject() {
+    context.performAndWait {
         guard let tester = MJCoreDataTester.mj_object(withKeyValues: Values.testJSONObject, context: context) else {
             XCTAssert(false, "conversion to core data object failed")
             return
         }
-        
+    
         XCTAssert(tester.isJuan == Values.isJuan)
         XCTAssert(tester.identifier == Values.identifier)
         XCTAssert(tester.name == Values.name)
         XCTAssert(tester.age == Values.age)
     }
-    
-    func coreDataObject2JSON() {
+}
+
+func coreDataObject2JSON() {
+    context.performAndWait {
         let coreDataObject =  NSEntityDescription.insertNewObject(forEntityName: MJCoreDataTester.entity().name!, into: context) as! MJCoreDataTester
         coreDataObject.name = Values.name
         coreDataObject.age = Int16(Values.age)
@@ -85,5 +86,6 @@ class CoreDataTests: XCTestCase {
         XCTAssert(dict["name"] as? String == Values.name)
         XCTAssert(dict["age"] as! Int == Values.age)
     }
+}
 
 }

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.3
+// swift-tools-version:5.1
 
 import PackageDescription
 

README.md

@@ -462,22 +462,20 @@ NSLog(@"%@", dictArray);
 
 ### <a id="Core_Data"></a> Core Data
 
-```objc
-NSDictionary *dict = @{
-                         @"name" : @"Jack",
-                         @"icon" : @"lufy.png",
-                         @"age" : @20,
-                         @"height" : @1.55,
-                         @"money" : @"100.9",
-                         @"sex" : @(SexFemale),
-                         @"gay" : @"true"
-                     };
-
-// This demo just provide simple steps
-NSManagedObjectContext *context = nil;
-User *user = [User mj_objectWithKeyValues:dict context:context];
-
-[context save:nil];
+```swift
+func json2CoreDataObject() {
+    context.performAndWait {
+        let object = MJCoreDataTester.mj_object(withKeyValues: Values.testJSONObject, context: context)
+        // use the object
+    }
+}
+
+func coreDataObject2JSON() {
+    context.performAndWait {        
+        let dict = coreDataObject.mj_keyValues()
+        // use dict
+    }
+}
 ```
 
 ### <a id="Coding"></a> Coding (Archive & Unarchive methods are deprecated in iOS 12)