Change the scan test to accept up to 8 odd keys

This attempts to fix #23

Author: PeterAdams-A

Tests/RediStackIntegrationTests/Commands/KeyCommandsTests.swift

@@ -122,32 +122,30 @@ final class KeyCommandsTests: RediStackIntegrationTestCase {
             XCTFail("Expected '.noExpiry' but lifetime was \(hasNoExpire)")
         }
     }
-    
-    // TODO: #23 -- Rework Scan Unit Test
-    // This is extremely flakey, and causes non-deterministic failures because of the assert on key counts
-//    func test_scan() throws {
-//        var dataset: [RedisKey] = .init(repeating: "", count: 10)
-//        for index in 1...15 {
-//            let key = RedisKey("key\(index)\(index % 2 == 0 ? "_even" : "_odd")")
-//            dataset.append(key)
-//            _ = try connection.set(key, to: "\(index)").wait()
-//        }
-//
-//        var (cursor, keys) = try connection.scanKeys(count: 5).wait()
-//        XCTAssertGreaterThanOrEqual(cursor, 0)
-//        XCTAssertGreaterThanOrEqual(keys.count, 5)
-//
-//        (_, keys) = try connection.scanKeys(startingFrom: cursor, count: 8).wait()
-//        XCTAssertGreaterThanOrEqual(keys.count, 8)
-//
-//        (cursor, keys) = try connection.scanKeys(matching: "*_odd").wait()
-//        XCTAssertGreaterThanOrEqual(cursor, 0)
-//        XCTAssertGreaterThanOrEqual(keys.count, 1)
-//        XCTAssertLessThanOrEqual(keys.count, 7)
-//
-//        (cursor, keys) = try connection.scanKeys(matching: "*_even*").wait()
-//        XCTAssertGreaterThanOrEqual(cursor, 0)
-//        XCTAssertGreaterThanOrEqual(keys.count, 1)
-//        XCTAssertLessThanOrEqual(keys.count, 7)
-//    }
+
+    func test_scan() throws {
+        var dataset: [RedisKey] = .init(repeating: "", count: 10)
+        for index in 1...15 {
+            let key = RedisKey("key\(index)\(index % 2 == 0 ? "_even" : "_odd")")
+            dataset.append(key)
+            _ = try connection.set(key, to: "\(index)").wait()
+        }
+
+        var (cursor, keys) = try connection.scanKeys(count: 5).wait()
+        XCTAssertGreaterThanOrEqual(cursor, 0)
+        XCTAssertGreaterThanOrEqual(keys.count, 5)
+
+        (_, keys) = try connection.scanKeys(startingFrom: cursor, count: 8).wait()
+        XCTAssertGreaterThanOrEqual(keys.count, 8)
+
+        (cursor, keys) = try connection.scanKeys(matching: "*_odd").wait()
+        XCTAssertGreaterThanOrEqual(cursor, 0)
+        XCTAssertGreaterThanOrEqual(keys.count, 1)
+        XCTAssertLessThanOrEqual(keys.count, 8)
+
+        (cursor, keys) = try connection.scanKeys(matching: "*_even*").wait()
+        XCTAssertGreaterThanOrEqual(cursor, 0)
+        XCTAssertGreaterThanOrEqual(keys.count, 1)
+        XCTAssertLessThanOrEqual(keys.count, 7)
+    }
 }