add tests for datasets

tests/Phpml/Dataset/ArrayDatasetTest.php

@@ -0,0 +1,29 @@
+<?php
+
+declare (strict_types = 1);
+
+namespace tests\Phpml\Dataset;
+
+use Phpml\Dataset\ArrayDataset;
+
+class ArrayDatasetTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @expectedException \Phpml\Exception\InvalidArgumentException
+     */
+    public function testThrowExceptionOnInvalidArgumentsSize()
+    {
+        new ArrayDataset([0, 1], [0]);
+    }
+
+    public function testArrayDataset()
+    {
+        $dataset = new ArrayDataset(
+            $samples = [[1], [2], [3], [4]],
+            $labels = ['a', 'a', 'b', 'b']
+        );
+
+        $this->assertEquals($samples, $dataset->getSamples());
+        $this->assertEquals($labels, $dataset->getLabels());
+    }
+}

tests/Phpml/Dataset/CsvDatasetTest.php

@@ -0,0 +1,28 @@
+<?php
+
+declare (strict_types = 1);
+
+namespace tests\Phpml\Dataset;
+
+use Phpml\Dataset\CsvDataset;
+
+class CsvDatasetTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @expectedException \Phpml\Exception\DatasetException
+     */
+    public function testThrowExceptionOnMissingFile()
+    {
+        new CsvDataset('missingFile', 3);
+    }
+
+    public function testSampleCsvDataset()
+    {
+        $filePath = dirname(__FILE__).'/Resources/dataset.csv';
+
+        $dataset = new CsvDataset($filePath, 2, true);
+
+        $this->assertEquals(10, count($dataset->getSamples()));
+        $this->assertEquals(10, count($dataset->getLabels()));
+    }
+}

tests/Phpml/Dataset/Resources/dataset.csv

@@ -0,0 +1,11 @@
+feature1,feature2,label
+1,1,a
+2,1,b
+3,1,c
+4,5,a
+2,4,a
+1,5,a
+2,6,b
+3,7,c
+4,4,a
+2,0,a