diff --git a/tests/phpunit/tests/functions/wpNonceField.php b/tests/phpunit/tests/functions/wpNonceField.php
new file mode 100644
index 0000000000..ec2c68727d
--- /dev/null
+++ b/tests/phpunit/tests/functions/wpNonceField.php
@@ -0,0 +1,77 @@
+<?php
+
+/**
+ * Tests for the wp_nonce_field() function.
+ *
+ * @since 6.1.0
+ *
+ * @group functions.php
+ * @covers ::wp_nonce_field
+ */
+class Tests_Functions_wpNonceField extends WP_UnitTestCase {
+
+	/**
+	 * @ticket 55578
+	 */
+	public function test_wp_nonce_field() {
+
+		wp_nonce_field();
+		$this->expectOutputRegex( '#^<input type="hidden" id="_wpnonce" name="_wpnonce" value=".{10}" /><input type="hidden" name="_wp_http_referer" value="" />$#' );
+	}
+
+	/**
+	 * @ticket 55578
+	 *
+	 * @dataProvider data_wp_nonce_field
+	 *
+	 * @param int|string $action Action name.
+	 * @param string     $name Nonce name.
+	 * @param bool       $referer Whether to set the referer field fior validation.
+	 * @param string     $expected_reg_exp The expected regular expression.
+	 */
+	public function test_wp_nonce_field_return( $action, $name, $referer, $expected_reg_exp ) {
+
+		$this->assertMatchesRegularExpression( $expected_reg_exp, wp_nonce_field( $action, $name, $referer, false ) );
+	}
+
+	/**
+	 * Data provider.
+	 *
+	 * @return array
+	 */
+	public function data_wp_nonce_field() {
+
+		return array(
+			'default'     => array(
+				'action'           => - 1,
+				'name'             => '_wpnonce',
+				'referer'          => true,
+				'expected_reg_exp' => '#^<input type="hidden" id="_wpnonce" name="_wpnonce" value=".{10}" /><input type="hidden" name="_wp_http_referer" value="" />$#',
+			),
+			'nonce_name'  => array(
+				'action'           => - 1,
+				'name'             => 'nonce_name',
+				'referer'          => true,
+				'expected_reg_exp' => '#^<input type="hidden" id="nonce_name" name="nonce_name" value=".{10}" /><input type="hidden" name="_wp_http_referer" value="" />$#',
+			),
+			'action_name' => array(
+				'action'           => 'action_name',
+				'name'             => '_wpnonce',
+				'referer'          => true,
+				'expected_reg_exp' => '#^<input type="hidden" id="_wpnonce" name="_wpnonce" value="' . wp_create_nonce( 'action_name' ) . '" /><input type="hidden" name="_wp_http_referer" value="" />$#',
+			),
+			'no_referer'  => array(
+				'action'           => - 1,
+				'name'             => '_wpnonce',
+				'referer'          => false,
+				'expected_reg_exp' => '#^<input type="hidden" id="_wpnonce" name="_wpnonce" value=".{10}" />$#',
+			),
+			'& in name'   => array(
+				'action'           => - 1,
+				'name'             => 'a&b',
+				'referer'          => false,
+				'expected_reg_exp' => '#^<input type="hidden" id="a\&amp;b" name="a\&amp;b" value=".{10}" />$#',
+			),
+		);
+	}
+}
diff --git a/tests/phpunit/tests/functions/wpRefererField.php b/tests/phpunit/tests/functions/wpRefererField.php
new file mode 100644
index 0000000000..d0642f4088
--- /dev/null
+++ b/tests/phpunit/tests/functions/wpRefererField.php
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * Tests for the wp_referer_field() function.
+ *
+ * @since 6.1.0
+ *
+ * @group functions.php
+ * @covers ::wp_referer_field
+ */
+class Tests_Functions_wpRefererField extends WP_UnitTestCase {
+
+	/**
+	 * @ticket 55578
+	 */
+	public function test_wp_referer_field() {
+
+		$_SERVER['REQUEST_URI'] = '/test/';
+		wp_referer_field();
+		$this->expectOutputString( '<input type="hidden" name="_wp_http_referer" value="/test/" />' );
+	}
+
+	/**
+	 * @ticket 55578
+	 */
+	public function test_wp_referer_field_return() {
+
+		$_SERVER['REQUEST_URI'] = '/test/';
+
+		$this->assertSame( '<input type="hidden" name="_wp_http_referer" value="/test/" />', wp_referer_field( false ) );
+	}
+}