### Question:
CLICommandInterface { public String[] parseCommand(String line) throws IOException { if (line == null) { return new String[0]; } List<String> matchList = new ArrayList<String>(); Pattern regex = Pattern.compile("[^\\s\"']+|\"([^\"]*)\"|'([^']*)'"); Matcher regexMatcher = regex.matcher(line); while (regexMatcher.find()) { if (regexMatcher.group(1) != null) { matchList.add(regexMatcher.group(1)); } else if (regexMatcher.group(2) != null) { matchList.add(regexMatcher.group(2)); } else { matchList.add(regexMatcher.group()); } } String[] args = new String[matchList.size()]; matchList.toArray(args); return args; } CLICommandInterface(CLIContext ctx); List<String> getPrefixes(); void addPrefix(String prefix); void execCommand(String line); String[] parseCommand(String line);  }### Answer:
@Test public void testparseCommand_LineIsNull() throws IOException { String[] args = cliCommandInterface.parseCommand(null); assertThat(args).isEmpty(); }
@Test public void testparseCommand_LineContainsSpacesOnly() throws IOException { String line = " "; String[] args = cliCommandInterface.parseCommand(line); assertThat(args).isEmpty(); }
@Test public void testparseCommand_NoQuotes() throws IOException { String line = "arg1 arg2 arg3"; String[] args = cliCommandInterface.parseCommand(line); assertThat(Arrays.asList(args)) .containsSequence("arg1", "arg2", "arg3"); }
@Test public void testparseCommand_SimpleQuotesArmuredArgWithoutSpaceWithin() throws IOException { String line = "arg1 'arg2' arg3"; String[] args = cliCommandInterface.parseCommand(line); assertThat(Arrays.asList(args)) .containsSequence("arg1", "arg2", "arg3"); }
@Test public void testparseCommand_SimpleQuotesArmuredArgWithSpacesWithin() throws IOException { String line = "arg1 'arg2 with spaces within' arg3"; String[] args = cliCommandInterface.parseCommand(line); assertThat(Arrays.asList(args)).containsSequence("arg1", "arg2 with spaces within", "arg3"); }
@Test public void testparseCommand_SimpleQuotesArmuredArgWithSpacesAndDoubleQuotesWithin() throws IOException { String line = "arg1 'arg2 with spaces and \"double quotes\" within' arg3"; String[] args = cliCommandInterface.parseCommand(line); assertThat(Arrays.asList(args)).containsSequence("arg1", "arg2 with spaces and \"double quotes\" within", "arg3"); }
@Test public void testparseCommand_DoubleQuotesArmuredArgWithoutSpacesWithin() throws IOException { String line = "arg1 \"arg2\" arg3"; String[] args = cliCommandInterface.parseCommand(line); assertThat(Arrays.asList(args)) .containsSequence("arg1", "arg2", "arg3"); }
@Test public void testparseCommand_DoubleQuotesArmuredArgWithSpacesWithin() throws IOException { String line = "arg1 \"arg2 with spaces within\" arg3"; String[] args = cliCommandInterface.parseCommand(line); assertThat(Arrays.asList(args)).containsSequence("arg1", "arg2 with spaces within", "arg3"); }
@Test public void testparseCommand_DoubleQuotesArmuredArgWithSpacesAndSimplequotesWithin() throws IOException { String line = "arg1 \"arg2 with spaces and 'simple quotes' within\" arg3"; String[] args = cliCommandInterface.parseCommand(line); assertThat(Arrays.asList(args)).containsSequence("arg1", "arg2 with spaces and 'simple quotes' within", "arg3"); }
@Test public void testparseCommand_SimpleQuotesArmuredEmptyArg() throws IOException { String line = "arg1 '' arg3"; String[] args = cliCommandInterface.parseCommand(line); assertThat(Arrays.asList(args)) .containsSequence("arg1", "", "arg3"); }
@Test public void testparseCommand_DoubleQuotesArmuredEmptyArg() throws IOException { String line = "arg1 \"\" arg3"; String[] args = cliCommandInterface.parseCommand(line); assertThat(Arrays.asList(args)) .containsSequence("arg1", "", "arg3"); }