// <copyright file="MeterProviderSdkTest.cs" company="OpenTelemetry Authors">
// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// </copyright>

using Xunit;

namespace OpenTelemetry.Metrics.Tests;

public class MeterProviderSdkTest
{
    [Fact]
    public void BuilderTypeDoesNotChangeTest()
    {
        var originalBuilder = Sdk.CreateMeterProviderBuilder();
        var currentBuilder = originalBuilder;

        var deferredBuilder = currentBuilder as IDeferredMeterProviderBuilder;
        Assert.NotNull(deferredBuilder);

        currentBuilder = deferredBuilder.Configure((sp, innerBuilder) => { });
        Assert.True(ReferenceEquals(originalBuilder, currentBuilder));

        currentBuilder = currentBuilder.ConfigureServices(s => { });
        Assert.True(ReferenceEquals(originalBuilder, currentBuilder));

        currentBuilder = currentBuilder.AddInstrumentation(() => new object());
        Assert.True(ReferenceEquals(originalBuilder, currentBuilder));

        currentBuilder = currentBuilder.AddMeter("MySource");
        Assert.True(ReferenceEquals(originalBuilder, currentBuilder));

        using var provider = currentBuilder.Build();

        Assert.NotNull(provider);
    }
}
