### Question:
BreakpointInfo { @Nullable public File getFile() { final String filename = this.filenameHolder.get(); if (filename == null) return null; if (targetFile == null) targetFile = new File(parentFile, filename); return targetFile; } BreakpointInfo(int id, @NonNull String url, @NonNull File parentFile,
                          @Nullable String filename);   BreakpointInfo(int id, @NonNull String url, @NonNull File parentFile,
                   @Nullable String filename, boolean taskOnlyProvidedParentPath); int getId(); void setChunked(boolean chunked); void addBlock(BlockInfo blockInfo); boolean isChunked(); boolean isLastBlock(int blockIndex); boolean isSingleBlock(); BlockInfo getBlock(int blockIndex); void resetInfo(); void resetBlockInfos(); int getBlockCount(); void setEtag(String etag); long getTotalOffset(); long getTotalLength(); @Nullable String getEtag(); String getUrl(); @Nullable String getFilename(); DownloadStrategy.FilenameHolder getFilenameHolder(); @Nullable File getFile(); BreakpointInfo copy(); BreakpointInfo copyWithReplaceId(int replaceId); void reuseBlocks(BreakpointInfo info); BreakpointInfo copyWithReplaceIdAndUrl(int replaceId, String newUrl); boolean isSameFrom(DownloadTask task); @Override String toString();  }### Answer:
@Test public void getPath() { BreakpointInfo info = new BreakpointInfo(0, "", new File(""), null); assertThat(info.getFile()).isNull(); final String parentPath = "/sdcard"; final String filename = "abc"; info = new BreakpointInfo(0, "", new File(parentPath), filename); assertThat(info.getFile()).isEqualTo(new File(parentPath, filename)); }