// Check what happens with Unicode caracters
        $u202F = "\u{202F}";
        $escapedU202F = "\\u{202F}";
        // Obviously those two strings are not equals
        $this->assertNotEquals($u202F, $escapedU202F);

        // this test fails :
        // $this->assertDumpEquals('"' . $u202F . '"', $u202F);
        // Output :
        /// Failed asserting that two strings are identical.
        // -'" "'
        // +'"\u{202F}"'

        // the dump of the first one \u{202F} is equal to the second one \\u{202F}
        // this test passes :
        $this->assertDumpEquals('"' . $escapedU202F . '"', $u202F);

        // since Intl 72, $var->getPatterns returns EEEE, MMMM d, y 'at' h:mm:ss\u{202F}a zzzz
        // The test fails as :
        // - it expects "EEEE, MMMM d, y 'at' h:mm:ss\u{202F}a zzzz" (\u{202F} is invisible, so in the console output it look's like "EEEE, MMMM d, y 'at' h:mm:ss a zzzz"
        // - but gets "EEEE, MMMM d, y 'at' h:mm:ss\\u{202F}a zzzz" (escaped version produced by dump since commit 69368454)
        // $expectedPattern = str_replace("\u{202F}", "\\u{202F}", $var->getPattern());
        $expectedPattern = $this->normalizeU202F($var->getPattern());