Initial unit tests, code cleanup

tests/autoload.php

@@ -0,0 +1,3 @@
+<?php
+
+// This is not an autoloader, it is used by the tests

tests/foo/bar/dataset.json

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+{
+    "datasets": {
+        "baz": {
+            "filename": "data/test.csv"
+        }
+    }
+}

tests/src/DatasetManagerTest.php

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+<?php
+
+namespace NoccyLabs\Dataset;
+
+defined("NOCCYLABS_DATASET_TEST") || define("NOCCYLABS_DATASET_TEST", true);
+
+class DatasetManagerTest extends \PHPUnit\Framework\TestCase
+{
+
+    /**
+     * @covers DatasetManager::__construct
+     * @covers DatasetManager::determineVendorPath
+     */
+    public function testCreatingTheDatasetManager()
+    {
+        $dm = new DatasetManager();
+    
+        $sets = $dm->getAvailableDatasets();
+        $this->assertEquals(1, count($sets), "Expected 1 loaded set");
+    }
+}