Add tests for HorizonPrometheusExporter and our Custom Exporters

tests/HorizonPrometheusExporter/ExporterRepositoryTest.php

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+<?php
+
+namespace Tests\HorizonPrometheusExporter;
+
+use LKDevelopment\HorizonPrometheusExporter\Repository\ExporterRepository;
+use Prometheus\CollectorRegistry;
+use Tests\TestCase;
+
+class ExporterRepositoryTest extends TestCase {
+    public function testCanBeCreated() {
+        // if nothing is passed to load(), exporters are read from the config at config/horizon-exporter.php
+        ExporterRepository::load();
+        $registry = ExporterRepository::getRegistry();
+        $this->assertInstanceOf(CollectorRegistry::class, $registry);
+    }
+}

tests/Metrics/FailedQsBatchesTest.php

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+<?php
+
+namespace Tests\Metrics;
+
+use App\Metrics\FailedQsBatches;
+use LKDevelopment\HorizonPrometheusExporter\Repository\ExporterRepository;
+use Tests\TestCase;
+
+class FailedQsBatchesTest extends TestCase {
+    public function testCanBeCreated() {
+        ExporterRepository::load([FailedQsBatches::class]);
+
+        self::assertNotNull(ExporterRepository::getRegistry());
+
+        $gauge = ExporterRepository::getRegistry()->getGauge(config('horizon-exporter.namespace'), 'qs_batches_failed_batches');
+
+        self::assertNotNull($gauge);
+
+    }
+}

tests/Metrics/PendingQsBatchesTest.php

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+<?php
+
+namespace Tests\Metrics;
+
+use App\Metrics\PendingQsBatches;
+use LKDevelopment\HorizonPrometheusExporter\Repository\ExporterRepository;
+use Tests\TestCase;
+
+class PendingQsBatchesTest extends TestCase {
+    public function testCanBeCreated() {
+        ExporterRepository::load([PendingQsBatches::class]);
+
+        self::assertNotNull(ExporterRepository::getRegistry());
+
+        $gauge = ExporterRepository::getRegistry()->getGauge(config('horizon-exporter.namespace'), 'qs_batches_pending_batches');
+
+        self::assertNotNull($gauge);
+    }
+}

tests/Metrics/WikiEntityImportsTest.php

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+<?php
+
+namespace Tests\Metrics;
+
+use App\Metrics\WikiEntityImports;
+use LKDevelopment\HorizonPrometheusExporter\Repository\ExporterRepository;
+use Tests\TestCase;
+
+class WikiEntityImportsTest extends TestCase {
+    public function testCanBeCreated() {
+        ExporterRepository::load([WikiEntityImports::class]);
+
+        self::assertNotNull(ExporterRepository::getRegistry());
+
+        $gauge = ExporterRepository::getRegistry()->getGauge(config('horizon-exporter.namespace'), 'wiki_entity_imports_pending');
+
+        self::assertNotNull($gauge);
+    }
+}