diff --git a/.changeset/odd-hounds-sing.md b/.changeset/odd-hounds-sing.md
new file mode 100644
index 00000000..81c39a62
--- /dev/null
+++ b/.changeset/odd-hounds-sing.md
@@ -0,0 +1,5 @@
+---
+"@wpengine/wp-graphql-content-blocks": patch
+---
+
+tests : Add tests for `CoreSeparator` block.
diff --git a/tests/unit/CoreSeparatorTest.php b/tests/unit/CoreSeparatorTest.php
new file mode 100644
index 00000000..36c7bffb
--- /dev/null
+++ b/tests/unit/CoreSeparatorTest.php
@@ -0,0 +1,195 @@
+<?php
+
+namespace WPGraphQL\ContentBlocks\Unit;
+
+final class CoreSeparatorTest extends PluginTestCase {
+	/**
+	 * The ID of the post created for the test.
+	 *
+	 * @var int
+	 */
+	public $post_id;
+
+	public function setUp(): void {
+		parent::setUp();
+
+		$this->post_id = wp_insert_post(
+			[
+				'post_title'   => 'Post with Separator',
+				'post_content' => '',
+				'post_status'  => 'publish',
+			]
+		);
+
+		\WPGraphQL::clear_schema();
+	}
+
+	public function tearDown(): void {
+		parent::tearDown();
+
+		wp_delete_post( $this->post_id, true );
+
+		\WPGraphQL::clear_schema();
+	}
+
+	public function query(): string {
+		return '
+			fragment CoreSeparatorBlockFragment on CoreSeparator {
+				attributes {
+					align
+					anchor
+					backgroundColor
+					className
+					cssClassName
+					gradient
+					lock
+					# metadata
+					opacity
+					style
+				}
+			}
+
+			query Post( $id: ID! ) {
+				post(id: $id, idType: DATABASE_ID) {
+					databaseId
+					editorBlocks {
+						apiVersion
+						blockEditorCategoryName
+						clientId
+						cssClassNames
+						innerBlocks {
+							name
+						}
+						isDynamic
+						name
+						parentClientId
+						renderedHtml
+						...CoreSeparatorBlockFragment
+					}
+				}
+			}
+		';
+	}
+
+	/**
+	 * Test the retrieval of core/separator block fields and attributes.
+	 */
+	public function test_retrieve_core_separator_attribute_fields(): void {
+		$block_content = '
+			<!-- wp:separator {"lock":{"move":true,"remove":true},"align":"wide","className":"is-style-dots","style":{"color":{"gradient":"linear-gradient(135deg,rgb(6,147,227) 1%,rgb(155,81,224) 100%)"}}} -->
+			<hr class="wp-block-separator alignwide has-alpha-channel-opacity"/>
+			<!-- /wp:separator -->
+		';
+
+		// Set post content.
+		wp_update_post(
+			[
+				'ID'           => $this->post_id,
+				'post_content' => $block_content,
+			]
+		);
+
+		$query     = $this->query();
+		$variables = [
+			'id' => $this->post_id,
+		];
+
+		$actual = graphql( compact( 'query', 'variables' ) );
+
+		$this->assertArrayNotHasKey( 'errors', $actual, 'There should not be any errors' );
+		$this->assertArrayHasKey( 'data', $actual, 'The data key should be present' );
+		$this->assertArrayHasKey( 'post', $actual['data'], 'The post key should be present' );
+		$this->assertEquals( $this->post_id, $actual['data']['post']['databaseId'], 'The post ID should match' );
+		$this->assertEquals( 1, count( $actual['data']['post']['editorBlocks'] ) );
+
+		$block = $actual['data']['post']['editorBlocks'][0];
+
+		// Verify the block data.
+		$this->assertNotEmpty( $block['apiVersion'], 'The apiVersion should be present' );
+		$this->assertEquals( 'design', $block['blockEditorCategoryName'], 'The blockEditorCategoryName should be text' );
+		$this->assertNotEmpty( $block['clientId'], 'The clientId should be present' );
+		$this->assertNotEmpty( $block['cssClassNames'], 'There should be cssClassNames' );
+		$this->assertEmpty( $block['innerBlocks'], 'There should be no inner blocks' );
+		$this->assertEquals( 'core/separator', $block['name'], 'The block name should be core/separator' );
+		$this->assertEmpty( $block['parentClientId'], 'There should be no parentClientId' );
+		$this->assertNotEmpty( $block['renderedHtml'], 'The renderedHtml should be present' );
+
+		// Verify the attributes.
+		$this->assertEquals(
+			[
+				'align'           => 'wide',
+				'anchor'          => null,
+				'backgroundColor' => null,
+				'className'       => 'is-style-dots',
+				'cssClassName'    => 'wp-block-separator alignwide has-alpha-channel-opacity',
+				'gradient'        => null,
+				'opacity'         => 'alpha-channel',
+				'style'           => wp_json_encode(
+					[
+						'color' => [
+							'gradient' => 'linear-gradient(135deg,rgb(6,147,227) 1%,rgb(155,81,224) 100%)',
+						],
+					]
+				),
+				'lock'            => wp_json_encode(
+					[
+						'move'   => true,
+						'remove' => true,
+					]
+				),
+			],
+			$block['attributes'],
+		);
+	}
+
+	/**
+	 * Tests additional CoreSeparatorAttributes values.
+	 *
+	 * Covers: `anchor`, `backgroundColor`, and `gradient`.
+	 */
+	public function test_retrieve_core_separator_attributes(): void {
+		$block_content = '
+			<!-- wp:separator {"gradient":"gradient-10","backgroundColor":"accent-4"}  -->
+			<hr class="wp-block-separator has-text-color has-accent-4-color has-alpha-channel-opacity has-accent-4-background-color has-background" id="test-anchor"/>
+			<!-- /wp:separator -->
+		';
+
+		// Set post content.
+		wp_update_post(
+			[
+				'ID'           => $this->post_id,
+				'post_content' => $block_content,
+			]
+		);
+
+		$query     = $this->query();
+		$variables = [
+			'id' => $this->post_id,
+		];
+
+		$actual = graphql( compact( 'query', 'variables' ) );
+
+		$this->assertArrayNotHasKey( 'errors', $actual, 'There should not be any errors' );
+		$this->assertArrayHasKey( 'data', $actual, 'The data key should be present' );
+		$this->assertArrayHasKey( 'post', $actual['data'], 'The post key should be present' );
+		$this->assertEquals( $this->post_id, $actual['data']['post']['databaseId'], 'The post ID should match' );
+		$this->assertEquals( 1, count( $actual['data']['post']['editorBlocks'] ) );
+		$this->assertEquals( 'core/separator', $actual['data']['post']['editorBlocks'][0]['name'], 'The block name should be core/separator' );
+
+		// Verify the attributes.
+		$this->assertEquals(
+			[
+				'align'           => null,
+				'anchor'          => 'test-anchor', // Previously untested.
+				'backgroundColor' => 'accent-4', // Previously untested.
+				'className'       => null,
+				'cssClassName'    => 'wp-block-separator has-text-color has-accent-4-color has-alpha-channel-opacity has-accent-4-background-color has-background',
+				'gradient'        => 'gradient-10', // Previously untested.
+				'opacity'         => 'alpha-channel',
+				'style'           => null,
+				'lock'            => null,
+			],
+			$actual['data']['post']['editorBlocks'][0]['attributes'],
+		);
+	}
+}