@Test void writeVarint_64() {
    long number = 300;

    byte[] bytes = new byte[WriteBuffer.varintSizeInBytes(number)];
    WriteBuffer.wrap(bytes).writeVarint(number);

    assertThat(bytes)
      .containsExactly(0b1010_1100, 0b0000_0010);
  }
Uses test data and codepoint wrapping trick from okhttp3.FormBodyTest
zipkin/src/test/java/zipkin2/internal/WriteBufferTest.java