final StringWriter stringWriter = new StringWriter();
        final PrintWriter writer = new PrintWriter(stringWriter);

        chatApiManager.sendSseEvent(writer, "chunk", Map.of("content", "Special chars: \"quotes\" and \\ backslash"));

        final String output = stringWriter.toString();
        assertTrue(output.contains("event: chunk"));
        // JSON should properly escape special characters

tongue:before{content:"\f589"}.fa-grin-tongue-squint:before{content:"\f58a"}.fa-grin-tongue-wink:before{content:"\f58b"}.fa-grin-wink:before{content:"\f58c"}.fa-grip-horizontal:before{content:"\f58d"}.fa-grip-lines:before{content:"\f7a4"}.fa-grip-lines-vertical:before{content:"\f7a5"}.fa-grip-vertical:before{content:"\f58e"}.fa-gripfire:before{content:"\f3ac"}.fa-grunt:before{content:"\f3ad"}.fa-guitar:before{content:"\f7a6"}.fa-gulp:before{content:"\f3ae"}.fa-h-square:before{content:"\f0fd"}.fa...

$theme-colors-border-subtle {\n    --#{$prefix}#{$color}-border-subtle: #{$value};\n  }\n\n  --#{$prefix}white-rgb: #{to-rgb($white)};\n  --#{$prefix}black-rgb: #{to-rgb($black)};\n\n  // Fonts\n\n  // Note: Use `inspect` for lists so that quoted items keep the quotes.\n  // See https://github.com/sass/sass/issues/2383#issuecomment-336349172\n  --#{$prefix}font-sans-serif: #{inspect($font-family-sans-serif)};\n  --#{$prefix}font-monospace: #{inspect($font-family-monospace)};\n  --#{$prefix}gradient: #{$gradient};\n\n...

--#{$color}: #{$value};\n  }\n\n  @each $color, $value in $theme-colors {\n    --#{$color}: #{$value};\n  }\n\n  @each $bp, $value in $grid-breakpoints {\n    --breakpoint-#{$bp}: #{$value};\n  }\n\n  // Use `inspect` for lists so that quoted items keep the quotes.\n  // See https://github.com/sass/sass/issues/2383#issuecomment-336349172\n  --font-family-sans-serif: #{inspect($font-family-sans-serif)};\n  --font-family-monospace: #{inspect($font-family-monospace)};\n}\n","// stylelint-disable declaration-no-important,...