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diff --git a/web/core/tests/Drupal/Tests/Core/Field/FieldInputValueNormalizerTraitTest.php b/web/core/tests/Drupal/Tests/Core/Field/FieldInputValueNormalizerTraitTest.php
new file mode 100644
index 000000000..2d85b3aac
--- /dev/null
+++ b/web/core/tests/Drupal/Tests/Core/Field/FieldInputValueNormalizerTraitTest.php
@@ -0,0 +1,100 @@
+<?php
+
+namespace Drupal\Tests\Core\Field;
+
+use Drupal\Core\Field\FieldInputValueNormalizerTrait;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * @coversDefaultClass \Drupal\Core\Field\FieldInputValueNormalizerTrait
+ * @group Field
+ */
+class FieldInputValueNormalizerTraitTest extends UnitTestCase {
+
+  use FieldInputValueNormalizerTrait;
+
+  /**
+   * @dataProvider keyValueByDeltaTestCases
+   * @covers ::normalizeValue
+   */
+  public function testKeyValueByDelta($input_value, $expected_value, $main_property_name = 'value') {
+    $this->assertEquals($expected_value, $this->normalizeValue($input_value, $main_property_name));
+  }
+
+  /**
+   * Test cases for ::testKeyValueByDelta.
+   */
+  public function keyValueByDeltaTestCases() {
+    return [
+      'Integer' => [
+        1,
+        [['value' => 1]],
+      ],
+      'Falsey integer' => [
+        0,
+        [['value' => 0]],
+      ],
+      'String' => [
+        'foo',
+        [['value' => 'foo']],
+      ],
+      'Empty string' => [
+        '',
+        [['value' => '']],
+      ],
+      'Null' => [
+        NULL,
+        [],
+      ],
+      'Empty field value' => [
+        [],
+        [],
+      ],
+      'Single delta' => [
+        ['value' => 'foo'],
+        [['value' => 'foo']],
+      ],
+      'Keyed delta' => [
+        [['value' => 'foo']],
+        [['value' => 'foo']],
+      ],
+      'Multiple keyed deltas' => [
+        [['value' => 'foo'], ['value' => 'bar']],
+        [['value' => 'foo'], ['value' => 'bar']],
+      ],
+      'No main property with keyed delta' => [
+        [['foo' => 'bar']],
+        [['foo' => 'bar']],
+        NULL,
+      ],
+      'No main property with single delta' => [
+        ['foo' => 'bar'],
+        [['foo' => 'bar']],
+        NULL,
+      ],
+      'No main property with empty array' => [
+        [],
+        [],
+        NULL,
+      ],
+    ];
+  }
+
+  /**
+   * @covers ::normalizeValue
+   */
+  public function testScalarWithNoMainProperty() {
+    $this->setExpectedException(\InvalidArgumentException::class, 'A main property is required when normalizing scalar field values.');
+    $value = 'foo';
+    $this->normalizeValue($value, NULL);
+  }
+
+  /**
+   * @covers ::normalizeValue
+   */
+  public function testKeyValueByDeltaUndefinedVariables() {
+    $this->assertEquals([], $this->normalizeValue($undefined_variable, 'value'));
+    $this->assertEquals([], $this->normalizeValue($undefined_variable['undefined_key'], 'value'));
+  }
+
+}