test(wpmc S3): ShortcodeDmr::render edge-case coverage

tests/ShortcodeDmrTest.php

@@ -52,4 +52,57 @@ final class ShortcodeDmrTest extends TestCase
 
         self::assertSame('Тюмень-текст', $result);
     }
+
+    public function test_render_returns_empty_when_id_is_zero(): void
+    {
+        \Brain\Monkey\Functions\expect('get_field')->never();
+        self::assertSame('', ShortcodeDmr::render(['id' => 0]));
+    }
+
+    public function test_render_returns_empty_when_current_town_is_null(): void
+    {
+        $_SERVER['REQUEST_URI'] = '/no-matching-segment/';
+        \Brain\Monkey\Functions\when('get_terms')->justReturn([10 => 'spb']);
+        \Brain\Monkey\Functions\expect('get_field')->never();
+
+        self::assertSame('', ShortcodeDmr::render(['id' => 42]));
+    }
+
+    public function test_render_returns_empty_when_term_lookup_fails(): void
+    {
+        $_SERVER['REQUEST_URI'] = '/tyumen/';
+        \Brain\Monkey\Functions\when('get_terms')->justReturn([11 => 'tyumen']);
+        \Brain\Monkey\Functions\when('get_term_by')->justReturn(false);
+        \Brain\Monkey\Functions\expect('get_field')->never();
+
+        self::assertSame('', ShortcodeDmr::render(['id' => 42]));
+    }
+
+    public function test_render_returns_empty_when_rows_are_empty(): void
+    {
+        $_SERVER['REQUEST_URI'] = '/tyumen/';
+        \Brain\Monkey\Functions\when('get_terms')->justReturn([11 => 'tyumen']);
+        $term = new \WP_Term();
+        $term->term_id = 11;
+        $term->slug = 'tyumen';
+        \Brain\Monkey\Functions\when('get_term_by')->justReturn($term);
+        \Brain\Monkey\Functions\expect('get_field')->once()->andReturn([]);
+
+        self::assertSame('', ShortcodeDmr::render(['id' => 42]));
+    }
+
+    public function test_render_returns_empty_when_no_row_matches(): void
+    {
+        $_SERVER['REQUEST_URI'] = '/tyumen/';
+        \Brain\Monkey\Functions\when('get_terms')->justReturn([10 => 'spb', 11 => 'tyumen']);
+        $term = new \WP_Term();
+        $term->term_id = 11;
+        $term->slug = 'tyumen';
+        \Brain\Monkey\Functions\when('get_term_by')->justReturn($term);
+        \Brain\Monkey\Functions\expect('get_field')
+            ->once()
+            ->andReturn([['town' => 10, 'text' => 'Только СПб']]);
+
+        self::assertSame('', ShortcodeDmr::render(['id' => 42]));
+    }
 }