Implement functional migration tests

Closes #19039

src/EFCore.Relational/Scaffolding/Metadata/DatabaseColumn.cs

@@ -61,5 +61,7 @@ public DatabaseColumn([NotNull] DatabaseTable table, [NotNull] string name, [Not
         ///     the database will not generate values.
         /// </summary>
         public virtual ValueGenerated? ValueGenerated { get; set; }
+
+        public override string ToString() => Name;
     }
 }

src/EFCore.Relational/Scaffolding/Metadata/DatabaseForeignKey.cs

@@ -58,5 +58,7 @@ public DatabaseForeignKey(
         ///     is deleted, or <c>null</c> if there is no action defined.
         /// </summary>
         public virtual ReferentialAction? OnDelete { get; set; }
+
+        public override string ToString() => Name ?? "<UNKNOWN>";
     }
 }

src/EFCore.Relational/Scaffolding/Metadata/DatabaseIndex.cs

@@ -45,5 +45,7 @@ public DatabaseIndex([NotNull] DatabaseTable table, [CanBeNull] string? name)
         ///     The filter expression, or <c>null</c> if the index has no filter.
         /// </summary>
         public virtual string? Filter { get; [param: CanBeNull] set; }
+
+        public override string ToString() => Name ?? "<UNKNOWN>";
     }
 }

src/EFCore.Relational/Scaffolding/Metadata/DatabasePrimaryKey.cs

@@ -35,5 +35,7 @@ public DatabasePrimaryKey([NotNull] DatabaseTable table, [CanBeNull] string? nam
         ///     The ordered list of columns that make up the primary key.
         /// </summary>
         public virtual IList<DatabaseColumn> Columns { get; }
+
+        public override string ToString() => Name ?? "<UNKNOWN>";
     }
 }

src/EFCore.Relational/Scaffolding/Metadata/DatabaseSequence.cs

@@ -63,5 +63,7 @@ public DatabaseSequence([NotNull] DatabaseModel database, [NotNull] string name)
         ///     Indicates whether or not the sequence will start over when the max value is reached, or <c>null</c> if not set.
         /// </summary>
         public virtual bool? IsCyclic { get; set; }
+
+        public override string ToString() => Schema == null ? Name : $"{Schema}.{Name}";
     }
 }

src/EFCore.Relational/Scaffolding/Metadata/DatabaseTable.cs

@@ -68,5 +68,7 @@ public DatabaseTable([NotNull] DatabaseModel database, [NotNull] string name)
         ///     The list of foreign key constraints defined on the table.
         /// </summary>
         public virtual IList<DatabaseForeignKey> ForeignKeys { get; }
+
+        public override string ToString() => Schema == null ? Name : $"{Schema}.{Name}";
     }
 }

src/EFCore.Relational/Scaffolding/Metadata/DatabaseUniqueConstraint.cs

@@ -35,5 +35,7 @@ public DatabaseUniqueConstraint([NotNull] DatabaseTable table, [CanBeNull] strin
         ///     The ordered list of columns that make up the constraint.
         /// </summary>
         public virtual IList<DatabaseColumn> Columns { get; }
+
+        public override string ToString() => Name ?? "<UNKNOWN>";
     }
 }