diff --git a/tests/phpunit/tests/fonts/font-face/wpFontFace/generateAndPrint.php b/tests/phpunit/tests/fonts/font-face/wpFontFace/generateAndPrint.php
index d10ea500e8707..a6454c11d1883 100644
--- a/tests/phpunit/tests/fonts/font-face/wpFontFace/generateAndPrint.php
+++ b/tests/phpunit/tests/fonts/font-face/wpFontFace/generateAndPrint.php
@@ -34,7 +34,7 @@ public function test_should_generate_and_print_given_fonts( array $fonts, $expec
 		$style_element   = "<style class='wp-fonts-local' type='text/css'>\n%s\n</style>\n";
 		$expected_output = sprintf( $style_element, $expected );
 
-		$this->expectOutputString( $expected_output );
-		$font_face->generate_and_print( $fonts );
+		$output = get_echo( array( $font_face, 'generate_and_print' ), array( $fonts ) );
+		$this->assertEqualHTML( $expected_output, $output );
 	}
 }
diff --git a/tests/phpunit/tests/fonts/font-face/wpPrintFontFaces.php b/tests/phpunit/tests/fonts/font-face/wpPrintFontFaces.php
index 2fa64559c2049..71cd964ca1bd8 100644
--- a/tests/phpunit/tests/fonts/font-face/wpPrintFontFaces.php
+++ b/tests/phpunit/tests/fonts/font-face/wpPrintFontFaces.php
@@ -37,8 +37,8 @@ public function test_should_not_print_when_no_fonts() {
 	public function test_should_print_given_fonts( array $fonts, $expected ) {
 		$expected_output = $this->get_expected_styles_output( $expected );
 
-		$this->expectOutputString( $expected_output );
-		wp_print_font_faces( $fonts );
+		$output = get_echo( 'wp_print_font_faces', array( $fonts ) );
+		$this->assertEqualHTML( $expected_output, $output );
 	}
 
 	public function test_should_escape_tags() {
@@ -60,9 +60,9 @@ public function test_should_escape_tags() {
 </style>
 
 CSS;
-		$this->expectOutputString( $expected_output );
 
-		wp_print_font_faces( $fonts );
+		$output = get_echo( 'wp_print_font_faces', array( $fonts ) );
+		$this->assertEqualHTML( $expected_output, $output );
 	}
 
 	public function test_should_print_fonts_in_merged_data() {
@@ -71,8 +71,8 @@ public function test_should_print_fonts_in_merged_data() {
 		$expected        = $this->get_expected_fonts_for_fonts_block_theme( 'font_face_styles' );
 		$expected_output = $this->get_expected_styles_output( $expected );
 
-		$this->expectOutputString( $expected_output );
-		wp_print_font_faces();
+		$output = get_echo( 'wp_print_font_faces' );
+		$this->assertEqualHTML( $expected_output, $output );
 	}
 
 	private function get_expected_styles_output( $styles ) {
diff --git a/tests/phpunit/tests/fonts/font-face/wpPrintFontFacesFromStyleVariations.php b/tests/phpunit/tests/fonts/font-face/wpPrintFontFacesFromStyleVariations.php
index a59ba882a4e86..5dd6304fd2f7b 100644
--- a/tests/phpunit/tests/fonts/font-face/wpPrintFontFacesFromStyleVariations.php
+++ b/tests/phpunit/tests/fonts/font-face/wpPrintFontFacesFromStyleVariations.php
@@ -43,8 +43,8 @@ public function test_should_print_fonts_in_style_variations() {
 		$expected        = $this->get_custom_style_variations( 'expected_styles' );
 		$expected_output = $this->get_expected_styles_output( $expected );
 
-		$this->expectOutputString( $expected_output );
-		wp_print_font_faces_from_style_variations();
+		$output = get_echo( 'wp_print_font_faces_from_style_variations' );
+		$this->assertEqualHTML( $expected_output, $output );
 	}
 
 	private function get_expected_styles_output( $styles ) {