✅ Test the DbStub a little bit too

Sources/Data/EF/DiceAppDbContextWithStub.cs

@@ -12,15 +12,22 @@ namespace Data.EF
             throw new NotImplementedException();
         }
 
+        public DiceAppDbContextWithStub()
+        { }
+
+        public DiceAppDbContextWithStub(DbContextOptions<DiceAppDbContext> options)
+            : base(options)
+        { }
+
         protected override void OnModelCreating(ModelBuilder modelBuilder)
         {
             base.OnModelCreating(modelBuilder);
 
             modelBuilder.Entity<PlayerEntity>().HasData(
-            new PlayerEntity { ID = Guid.NewGuid(), Name = "Alice" },
-            new PlayerEntity { ID = Guid.NewGuid(), Name = "Bob" },
-            new PlayerEntity { ID = Guid.NewGuid(), Name = "Clyde" },
-            new PlayerEntity { ID = Guid.NewGuid(), Name = "Dahlia" }
+            new PlayerEntity { ID = Guid.NewGuid(), Name = "Alice" }, // some tests depend on this name
+            new PlayerEntity { ID = Guid.NewGuid(), Name = "Bob" }, // some tests depend on this name
+            new PlayerEntity { ID = Guid.NewGuid(), Name = "Clyde" }, // some tests depend on this name
+            new PlayerEntity { ID = Guid.NewGuid(), Name = "Dahlia" } // some tests depend on this name
             );
         }
     }

Sources/Tests/Data_UTs/Players/PlayerDbManagerTest.cs

@@ -33,6 +33,29 @@ namespace Tests.Data_UTs.Players
                 .Options;
         }
 
+        [Theory]
+        [InlineData("Alice")]
+        [InlineData("Bob")]
+        [InlineData("Clyde")]
+        [InlineData("Dahlia")]
+        public void TestDbStubContainsAll(string name)
+        {
+            // Arrange
+
+            PlayerDbManager mgr;
+
+            // Act
+
+            using (DiceAppDbContextWithStub db = new(options))
+            {
+                db.Database.EnsureCreated();
+                mgr = new(db);
+
+                // Assert
+
+                Assert.True(mgr.IsPresentByName(name));
+            }
+        }
 
         [Fact]
         public void TestConstructorWhenGivenContextThenConstructs()