Initial entry tests

lib/Parser/Construct.php

@@ -97,9 +97,9 @@ trait Construct {
         return null;
     }
 
-    protected function empty($o): bool {
-        return !array_filter((array) $o, function($v) {
-            return !is_null($v) && (!$v instanceof Collection || sizeof($v) > 0);
-        });
+    protected function empty($o, array $ignore = []): bool {
+        return !array_filter((array) $o, function($v, $k) use($ignore) {
+            return !in_array($k, $ignore) && !is_null($v) && (!$v instanceof Collection || sizeof($v) > 0);
+        }, \ARRAY_FILTER_USE_BOTH);
     }
 }

lib/Parser/XML/Feed.php

@@ -223,7 +223,7 @@ class Feed extends Construct implements \MensBeam\Lax\Parser\Feed {
         $out = [];
         foreach ($this->xpath->query("atom:entry|rss2:item|rss0:item|rss1:item|/rdf:RDF/rss0:item|/rdf:RDF/rss1:item", $this->subject) as $node) {
             $entry = (new EntryParser($node, $this->xpath, $feed))->parse();
-            if (!$this->empty($entry)) {
+            if (!$this->empty($entry, ["lang"])) {
                 $out[] = $entry;
             }
         }

tests/cases/XML/entry-atom.yaml

@@ -0,0 +1,42 @@
+Empty entry:
+    input: >
+        <feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en">
+            <entry>Bogus text</entry>
+        </feed>
+    output:
+        format: atom
+        version: '1.0'
+        lang: en
+
+Entry identifier:
+    input: >
+        <feed xmlns="http://www.w3.org/2005/Atom">
+            <entry>
+                <id>ook</id>
+            </entry>
+        </feed>
+    output:
+        format: atom
+        version: '1.0'
+        entries:
+            - id: 'ook'
+
+Entry language:
+    input: >
+        <feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en">
+            <entry xml:lang="fr">
+                <id>ook</id>
+            </entry>
+            <entry>
+                <id>eek</id>
+            </entry>
+        </feed>
+    output:
+        format: atom
+        version: '1.0'
+        lang: en
+        entries:
+            - id: 'ook'
+              lang: fr
+            - id: eek
+              lang: en