Add comparison operators to KeyValue expression

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

tests/Expression/KeyValueTest.php

@@ -8,15 +8,26 @@ final class KeyValueExpressionTest extends TestCase {
 
     public function testSimpleKeyvalue()
     {
-        $keyvalue = KeyValue::set('_measurement', 'test_measurement')
-            ->and('_field', 'user')
-            ->or('_field', 'field2')
-            ->and('user', 'my_username');
+        $keyvalue = KeyValue::setEquals('_measurement', 'test_measurement')
+            ->andEquals('_field', 'user')
+            ->or('count', '>=', '1')
+            ->and('user', '==', 'my_username')
+            ->orEquals('test', 'world');
 
         $query = 'r._measurement == "test_measurement" and r._field == "user" or ' . 
-            'r._field == "field2" and r.user == "my_username"';
+            'r.count >= "1" and r.user == "my_username" or r.test == "world"';
 
         $this->assertEquals($keyvalue->__toString(), $query);
     }
 
+    public function testInvalidOperator()
+    {
+        $this->expectException(Exception::class);
+
+        $keyvalue = KeyValue::set('_measurement', '9dkda9e', 'test_measurement')
+            ->andEquals('_field', 'user')
+            ->or('_field', '==', 'field2')
+            ->andEquals('user', 'my_username');
+    }
+
 }

tests/Function/FilterFunctionTest.php

@@ -9,10 +9,10 @@ final class FilterFunctionTest extends TestCase {
 
     public function testSimpleFilter()
     {
-        $expression = new Filter(KeyValue::set('_measurement', 'test_measurement')
-            ->and('_field', 'user')
-            ->or('_field', 'field2')
-            ->and('user', 'my_username')
+        $expression = new Filter(KeyValue::setEquals('_measurement', 'test_measurement')
+            ->andEquals('_field', 'user')
+            ->orEquals('_field', 'field2')
+            ->andEquals('user', 'my_username')
         );
 
         $query = '|> filter(fn: (r) => r._measurement == "test_measurement" and r._field == "user" or ' . 

tests/QueryBuilderTest.php

@@ -43,7 +43,7 @@ final class QueryBuilderTest extends TestCase {
                 ],
                 'test_measurement',
                 '-360h',
-                new KeyValue('user', 'username'),
+                KeyValue::setEquals('user', 'username'),
                 'from(bucket: "example_bucket") |> range(start: "-360h") |> filter(fn: (r) => r._measurement == "test_measurement") ' . 
                     '|> filter(fn: (r) => r.user == "username") '
             ],