@Test
    public void poppedSectionsEscapeCustomExpressionStarts() {
        CodeWriter writer = CodeWriter.createDefault();
        String result = writer
                .setExpressionStart('#')
                .pushState("foo")
                .write("##Hello")
                .write("$Hello")
                .write("$$Hello")
                .popState()
                .toString();

        assertThat(result, equalTo("#Hello\n$Hello\n$$Hello\n"));
    }
\n"
                                + " * Foo \"foo!\"\n"
                                + " *\n"
                                + " * \"baz\"!\n"
                                + " * Yap!\n"
                                + " *     This is indented, in flow of parent.\n"
                                + " *     Yap!\n"
                                + " *     Yap?\n"
                                + " *     # Has a prefix\n"
                                + " *     # Yes\n"
                                + "
smithy-utils/src/test/java/software/amazon/smithy/utils/CodeWriterTest.java