Add tests for Value column quoting in Single/SingleOrDefault queries. Fix #1234.

Author: fdcastel

src/FirebirdSql.EntityFrameworkCore.Firebird.Tests/Query/ElementaryTests.cs

@@ -209,6 +209,53 @@ public async Task SelectWithCollate()
 			StringAssert.Contains(@"CAST(_UTF8'test' AS VARCHAR(4) CHARACTER SET UTF8) COLLATE UNICODE_CI_AI", sql);
 		}
 	}
+
+	[Test]
+	public async Task SqlQueryScalarSingleQuotesValueColumn()
+	{
+		await using (var db = await GetDbContext<SelectContext>())
+		{
+			var result = await db.Database.SqlQueryRaw<int>(@"SELECT 1 AS ""Value"" FROM RDB$DATABASE").SingleAsync();
+			var sql = db.LastCommandText;
+			Assert.AreEqual(1, result);
+			StringAssert.DoesNotContain("Value", sql.Replace(@"""Value""", string.Empty));
+		}
+	}
+
+	[Test]
+	public async Task SqlQueryScalarSingleOrDefaultQuotesValueColumn()
+	{
+		await using (var db = await GetDbContext<SelectContext>())
+		{
+			var result = await db.Database.SqlQueryRaw<int>(@"SELECT 1 AS ""Value"" FROM RDB$DATABASE").SingleOrDefaultAsync();
+			var sql = db.LastCommandText;
+			Assert.AreEqual(1, result);
+			StringAssert.DoesNotContain("Value", sql.Replace(@"""Value""", string.Empty));
+		}
+	}
+
+	[Test]
+	public async Task SqlQueryScalarComposedWhereQuotesValueColumn()
+	{
+		await using (var db = await GetDbContext<SelectContext>())
+		{
+			var query = db.Database.SqlQueryRaw<int>(@"SELECT 1 AS ""Value"" FROM RDB$DATABASE").Where(x => x > 0);
+			Assert.DoesNotThrowAsync(() => query.LoadAsync());
+			var sql = db.LastCommandText;
+			StringAssert.DoesNotContain("Value", sql.Replace(@"""Value""", string.Empty));
+		}
+	}
+
+	[Test]
+	public async Task EntitySingleOrDefaultQuotesIdentifiers()
+	{
+		await using (var db = await GetDbContext<SelectContext>())
+		{
+			var result = await db.Set<MonAttachment>().OrderBy(x => x.AttachmentId).Take(1).SingleOrDefaultAsync();
+			var sql = db.LastCommandText;
+			Assert.IsNotNull(result);
+		}
+	}
 }
 
 class SelectContext : FbTestDbContext