PrometheusExporterMeterProviderBuilderExtensionsTests.cs

// <copyright file="PrometheusExporterMeterProviderBuilderExtensionsTests.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 Microsoft.Extensions.DependencyInjection;
using OpenTelemetry.Metrics;
using Xunit;

namespace OpenTelemetry.Exporter.Prometheus.AspNetCore.Tests;

public sealed class PrometheusExporterMeterProviderBuilderExtensionsTests
{
    [Fact]
    public void TestAddPrometheusExporter_NamedOptions()
    {
        int defaultExporterOptionsConfigureOptionsInvocations = 0;
        int namedExporterOptionsConfigureOptionsInvocations = 0;

        using var meterProvider = Sdk.CreateMeterProviderBuilder()
            .ConfigureServices(services =>
            {
                services.Configure<PrometheusAspNetCoreOptions>(o => defaultExporterOptionsConfigureOptionsInvocations++);

                services.Configure<PrometheusAspNetCoreOptions>("Exporter2", o => namedExporterOptionsConfigureOptionsInvocations++);
            })
            .AddPrometheusExporter()
            .AddPrometheusExporter("Exporter2", o => { })
            .Build();

        Assert.Equal(1, defaultExporterOptionsConfigureOptionsInvocations);
        Assert.Equal(1, namedExporterOptionsConfigureOptionsInvocations);
    }
}