Add Flux from() and filter() methods

Signed-off-by: davidarendsen <davidarendsen@hey.com>

tests/Expression/FilterExpressionTest.php

@@ -0,0 +1,27 @@
+<?php
+declare(strict_types=1);
+
+use Arendsen\FluxQueryBuilder\Expression\Filter\AndExpression;
+use Arendsen\FluxQueryBuilder\Expression\Filter\OrExpression;
+use Arendsen\FluxQueryBuilder\Expression\Filter\Measurement;
+use Arendsen\FluxQueryBuilder\Function\Filter;
+use PHPUnit\Framework\TestCase;
+
+final class FilterFunctionTest extends TestCase {
+
+    public function testSimpleFilter()
+    {
+        $expression = new Filter([
+            new Measurement('test_measurement'),
+            new AndExpression('_field', 'user'),
+            new OrExpression('_field', 'field2'),
+            'and r.user == "my_username"',
+        ]);
+
+        $query = '|> filter(fn: (r) => r._measurement == "test_measurement" and r._field == "user" or ' . 
+            'r._field == "field2" and r.user == "my_username") ';
+
+        $this->assertEquals($expression->__toString(), $query);
+    }
+
+}

tests/Expression/FromExpressionTest.php

@@ -0,0 +1,38 @@
+<?php
+declare(strict_types=1);
+
+use Arendsen\FluxQueryBuilder\Function\From;
+use PHPUnit\Framework\TestCase;
+
+final class FromExpressionTest extends TestCase {
+
+    /**
+     * @dataProvider somethingProvider
+     */
+    public function testSomething($settings, $query)
+    {
+        $expression = new From($settings);
+
+        $this->assertEquals($expression->__toString(), $query);
+    }
+
+    public function somethingProvider(): array
+    {
+        return [
+            'from bucket' => [
+                [
+                    'bucket' => 'test-bucket',
+                ],
+                'from(bucket: "test-bucket") '
+            ],
+            'from bucket and host' => [
+                [
+                    'bucket' => 'test-bucket',
+                    'host' => 'test',
+                ],
+                'from(bucket: "test-bucket", host: "test") '
+            ],
+        ];
+    }
+
+}

tests/QueryBuilderTest.php

@@ -0,0 +1,39 @@
+<?php
+declare(strict_types=1);
+
+use PHPUnit\Framework\TestCase;
+use Arendsen\FluxQueryBuilder\QueryBuilder;
+
+final class QueryBuilderTest extends TestCase {
+
+    /**
+     * @dataProvider somethingProvider
+     */
+    public function testSomething($bucket, $measurement, $range, $expectedQuery)
+    {
+        $queryBuilder = new QueryBuilder();
+        $queryBuilder->from($bucket)
+            ->fromMeasurement($measurement)
+			->addRangeStart($range);
+
+        $this->assertEquals($queryBuilder->build(), $expectedQuery);
+    }
+
+    public function somethingProvider(): array
+    {
+        return [
+            'case 1' => [
+                [
+                    'bucket' => 'example-bucket', 
+                    'host' => 'host', 
+                    'org' => 'example-org', 
+                    'token' => 'token'
+                ],
+                'test_measurement',
+                '-360h',
+                'from(bucket: "test_bucket", host: "host", org: "example-org", token: "token") |> '
+            ],
+        ];
+    }
+
+}