Improve test code coverage

[remkop]

CommandLine

• isUsageHelpRequested (before parsing anything vs after parsing something)
• isVersionHelpRequested (before parsing anything vs after parsing something)
• getEndOfOptionsDelimiter (subcommands)
• setEndOfOptionsDelimiter (subcommands)
• getUnmatchedArguments (before parsing anything vs after parsing something)
• getParseResult (before parsing anything vs after parsing something)
• AbstractHandler.returnResultOrExit (when hasExitCode() == true)
• printHelpIfRequested(List, PrintStream, Ansi)
• printHelpIfRequested(ParseResult)
• printHelpIfRequested(List, PrintStream, PrintStream, ColorScheme), where CommandSpec.helpCommand() == true but does not implement IHelpCommandInitializable
• execute, where Runnable throws ExecutionException
• execute, where Callable throws ExecutionException
• execute, where Callable throws ParameterException
• execute, where command method is static
• execute, where command method is not a subcommand and is in class that only has non-default constructors
• execute, where invoking the command method throws ExecutionException
• execute, where invoking the command method throws other Exception
• execute, where preparing to invoke the command method throws other Exception (private constructor, constructor throws exception?)
• RunAll.self() (why are RunFirst.self() and RunLast.self() tested but RunAll.self() is not?)
• parseWithHandlers(IParseResultHandler2, IExceptionHandler2, String...) when ExecutionException is thrown by IParseResultHandler2
• private StringBuilder usage(StringBuilder, Help) where renderer != null
• static call(Callable, PrintStream, PrintStream, Ansi, String...) where results == null
• static call(Class, IFactory, PrintStream, PrintStream, Ansi, String...) where results == null
• static invoke(String, Class, PrintStream, Ansi, String...)
• static invoke(String, Class, PrintStream, PrintStream, Ansi, String...) where candidates size != 1
• NoCompletionCandidates.iterator() - should throw UnsupportedOperationEx
• NoDefaultProvider.defaultValue()
• constructor Range(int, int, boolean, boolean, String) - where min < 0, max < 0
• Range.optionArity - where member.isAnnotationPresent(Option) == false
• Range.parameterArity - where member.isMethodParameter() == false
• Range.parameterIndex(Field)
• Range.defaultArity(Field)
• Range.defaultArity(Class)
• Range.parameterArity(Range, Range) - where arity.isVariable == true and arity.isVariable == false
• Range.max(int)
• Range.equals - where object is not a Range, where field values differ/same
• CommandSpec.parser(ParserSpec)
• CommandSpec.usageMessage(UsageMessageSpec)
• CommandSpec.addSubcommand - where previous != null && previous != subcommandLine, or different subcommand has same alias
• CommandSpec.initResourceBundle - where current resourceBundle != null
• CommandSpec.addMethodSubcommands()
• CommandSpec.addMethodSubcommands(IFactory) - where userObject instance of Method
• CommandSpec.addOption - where existing == null || existing.equals(option) - add same option twice : no DuplicateOptionException
• CommandSpec.aliases - where aliases == null
• CommandSpec.mixinStandardHelpOptions - where name.length==2 && !name.startsWith("-") //?
• CommandSpec.initHelpCommand - if !initializable
• CommandSpec.initVersionProvider(IVersionProvider) - if this.versionProvider != null
• CommandSpec.initVersionProvider(Class, IFactory)
• CommandSpec.initDefaultValueProvider(IDefaultValueProvider) - if this.defaultValueProvider != null
• CommandSpec.findOption(char, Iterable) -
• CommandSpec.resemblesOption - with null Tracer
• UsageMessageSpec.customSynopsis setter
• UsageMessageSpec.hidden setter
• UsageMessageSpec.commandListHeading setter
• UsageMessageSpec.initFromMixin(UsageMessageSpec, CommandSpec) - with non-default hidden
• UsageMessageSpec.initFrom(UsageMessageSpec, CommandSpec)
• ParserSpec.initFrom(ParserSpec)
• ArgSpec constructor - where builder.auxTypes is empty array
• ArgSpec.renderedDescription() - where desc.length ==0 (empty array)
• ArgSpec.getter()
• ArgSpec.getValue - where getter throws PicocliEx or other Exception
• ArgSpec.setValue - where setter throws PicocliEx or other Exception
• ArgSpec.setValue(T, CommandLine) - where setter throws other Exception
• ArgSpec.debug where level is (not?) DEBUG
• ArgSpec.splitRespectingQuotedStrings - with embedded '' backslash; with unbalanced quotes; where !quotedValues.isEmpty
• ArgSpec.restoreQuotedStrings - with embedded '' backslash
• ArgSpec.equalsImpl - where other==this; arit, hideParamSyntax, required, splitRegex, description, descriptionKey, auxTypes
• ArgSpec.Builder.descriptionKey() getter
• ArgSpec.Builder.hideParamSyntax() getter
• ArgSpec.Builder.hasInitialValue() getter
• ArgSpec.Builder.completionCandidates() getter
• OptionSpec constructor - where names.length==0 || names.contains("")
• OptionSpec.internalShowDefaultValue(boolean) - all combinations
• OptionSpec.equals - equals names, equals super
• PositionalParamSpec.description - where newValue == null or not null
• PositionalParamSpec.equals - where capacity, index differ/same
• PositionalParamSpec where both getter and setter are null
• MethodParam.getDeclaringExecutable
• MethodParam.isAccessible
• TypedMember constructor (5990) where
  [ ] - combinations: params.length==0 && returnType != Void.Type && returnType != Void.class
  [ ] - both getter and setter (cannot be true, fix constructor)
  [ ] - isGetter but not proxy
• TypedMember.initializeInitialValue - Exception thrown from setter
• TypedMember.propertyName - where name.length > 3 && starts with "get" or "set"
• TypedMember.decapitalize - where name == null or name == ""
• Messages.copy - where original == null/not null
• Messages.empty - where messages.rb == null
• Messages.getString - where rb == null or this.keys is empty
• Messages.getStringArray - where rb == null or this.keys is empty
• Messages.commandSpec
• CommandReflection.extractCommandSpec - where object is a class, an InitializationException occurred, but class is not an interface
• CommandReflection.initSubcommands - where NoSuchMethodException occurred
• CommandReflection.subcommandName - where @command(name = "")
• CommandReflection.validateUnmatched - where only unmatched
• CommandReflection.validateArgSpecField - where both mixin and @option; where final non-primitive: no InitializationException
• CommandReflection.validateInjectSpec - where @Inject && @Option/@parameters; where @Inject and @unmatched; where @Inject and @mixin
• CommandReflection.buildMixinForField - where factory throws Exception
• CommandReflection.buildUnmatchedForField - where List; where member.getter().get() returns null
• ArgsReflection
• ArgsReflection.inferLabel - where types.length == 1
• ArgsReflection.inferTypes - where paramTypes[i] not instanceof WildcardType
• FieldBinding.get - where field.get throws Exception (inaccessible?)
• MethodBinding.get - where method.invoke throws Exception (inaccessible?)
• ParseResult.nowProcessing - where nowProcessing == null
• ParseResult.addUnmatched(String)
• ParseResult.addUnmatched(Stack)
• ParseResult.matchedPositional - where matchedPositionalParams.size <= position
• ParseResult.matchedPositionals
• Interpreter.parse - with all combinations of ANSI, TTY, XTerm, etc?
• Interpreter.addOrExpand - where config.expandAtFiles == false; where traceLevel == INFO
• Interpreter.expandArgumentFile - where traceLevel == INFO
• Interpreter.expandValidArgumentFile - where line starts with #; where Exception occurred; where traceLevel == INFO
• Interpreter.useSimplifiedAtFiles - where system property "picocli.useSimplifiedAtFiles" is empty string
• Interpreter.parse - where Exception caught and ParserSpec.collectErrors == true
• Interpreter.applyDefaultValues - where Tracer is DEBUG
• Interpreter.processArguments
  [ ] - where option=value and optionsMap.contains(key) and optionsMap.contains(value) and Tracer is DEBUG
  [ ] - where Tracer is DEBUG
• Interpreter.handleUnmatchedArgument - where stack is empty
• Interpreter.processPositionalParameter
  [ ] - where Tracer is DEBUG
  [ ] - where assertNoMissingParameters returned false
  [ ] - where args.isEmpty when done
• Interpreter.processClusteredShortOptions
  [ ] - where cluster.length == 0 (NOTE: the internal cluster.length > 0 condition before taking a substring is redundant)
  [ ] - where cluster.length == 0
  [ ] - where arg.endsWith(cluster) is false
• Interpreter.applyOption (7393)
  [ ] - where args stack is empty
  [ ] - where Tracer DEBUG
  [ ] - where workingStack not empty after popping one element (NOTE may not be reproducible)
• Interpreter.applyValueToSingleValuedField (7434)
  [ ] - where arity.max > 0 and value.equals("abc")
  [ ] - where arity.max > 0 and value.equals("true") and lookBehind.isAttached
  [ ] - where non-boolean option with omitted optional value, followed by another option
  [ ] - where this method is invoked with an empty stack
  [ ] - where a initialized=null Set is passed as parameter
• Interpreter.applyValueToMapField (7508) - where auxTypes.length < 2
• Interpreter.consumeMapArguments (7548)
  [ ] - where an empty args stack is passed in
  [ ] - where option arity is 1..5 and args.length < 5
• Interpreter.canConsumeOneMapArgument (7600)
• Interpreter.splitKeyValue where option value is not in KEY=VALUE format
• Interpreter.applyValuesToArrayField - where String values are converted to Collection objects - this gets flattened
• Interpreter.applyValuesToCollectionField - where String values are converted to Collection objects - this gets flattened
• Interpreter.consumeArguments - where type is Boolean and arity > 1
• Interpreter.consumedCountMap - where ParserSpec.splitFirst == true
• Interpreter.varargCanConsumeNextValue
  [ ] - where endOfOptions && arg.isPositional
  [ ] - where nextValue is not a command and not an option
• Interpreter.is (7865) - where value == true and Tracer INFO
• Interpreter.createCollection - where collectionClass is a concrete Collection (not an interface)
• Interpreter.assertNoMissingParameters
  [ ] - where arity.min > available, arity.min==1, argSpec.isOption and don't throw (ParserSpec.collectErrors is true)
  [ ] - where arity.min > available, arity.min==1, and count<=1 || arity.min - available <= 1
• Interpreter.unquote
  [ ] - where value is null
  [ ] - where value.length <= 1
• Interpreter.readPassword (7969) NOTE can only be tested on Java 6+
  [ ] - where echoInput is true
  [ ] - where InputStream.readLine throws IOException
• BuiltIn.ISO8601TimeConverter
  [ ] - where value.length > 12
  [ ] - where value is "12X09" throws ParseException
• BuiltIn.ISO8601TimeConverter.createTime with invalid epochMillis should throw TypeConversionException
• BuiltIn.ISO8601TimeConverter.registerIfAvailable - where registry is null
• BuiltIn.ByteOrderConverter with "BIG_ENDIAN" value
• BuiltIn.NetworkInterfaceConverter where NetworkInterface.getByName throws exception (cannot list interfaces) TODO requires mocking?
• BuiltIn.registerIfAvailable - with invalid factory class name
• BuiltIn.ReflectionConverter.convert (8217) NOTE may not be able to reproduce Exception
• AutoHelpMixin.run - where run is called before init
• Help.addAllSubcommands with null map
• Help.addSubcommand
• Help.synopsis() getter
• Help.abbreviatedSynopsis - where positionalParam.isHidden is true
• Help.detailedSynopsis(Comparator, boolean)
• Help.createDetailedSynopsisOptionsText where shortestName==2 && does not start with "-" or where shortestName != 2 && shortestName.startsWith("-")
• Help.heading(Ansi, int, String, Object...) - where result.endsWith(lineSep)
• Help.countTrailingSpaces - where str is null
• Help.join - where values is null
• Help.format - where formatString == ""
• Help.join(String[], int, int, String) - where names == null (8944)
• Help.createDefaultLayout
• Help.createMinimalParamLabelRenderer().separator()
• Help.MinimalOptionRenderer.render - where option.description.length == 0
• Help.MinimalParameterRenderer.render - where option.description.length == 0
• Help.DefaultParameterRenderer.createDescriptionFirstLines - where description is an empty array or an array of one empty string
• Help.Layout(ColorScheme, int) constructor (9348)
• Help.SortByShortestOptionNameAlphabetically - where o1 is null or o2 is null
• Help.TextTable(Ansi, Column[]) constructor - where columns.length == 0 (should throw IllegalArgEx)
• Help.TextTable.cellAt
• Help.TextTable.addRowValues - where a value in the array is null
• Help.TextTable.putValue - where row > rowCount() - 1
• Help.TextTable.putValue - where value is null or value is empty String
• Help.TextTable.putValue - are all column.overFlow values covered in the switch? - IllegalStateException never thrown (9700)
• Help.ColorScheme empty constructor (9790)
• Help.Ansi.isXterm - where System.getenv("TERM") starts with "xterm"
• Help.Ansi.hasOsType - where System.getenv("OSTYPE") is not null
• Help.Ansi.calcTTY
• Help.Ansi.ansiPossible
• Help.Ansi.isJansiConsoleInstalled
• Help.Style.parse - where missing closing bracket in "fg(white" or "bg(white"
• Help.Text.splitLines where ... (10174)
• Help.Text.append(String)
• Help.Text.append(Text)
• Help.Text.hashCode
• Assert.equals - where o1 is null or o2 is null
• Tracer.isWarn
• CosineSimilarity.countNgramFrequency - where ... (10368)
• ParameterException(CommandLine, String, Throwable, ArgSpec, String) constructor where argSpec and value are both null
• ParameterException(CommandLine, String, ArgSpec, String) constructor where argSpec and value are both null
• UnmatchedArgumentException(CommandLine,Stack) constructor
• UnmatchedArgumentException.getUnmatched()
• UnmatchedArgumentException.getSuggestions() - where unmatched is null or empty
• UnmatchedArgumentException.isunknownOption - where unmatch == null or unmatch is empty

AutoComplete

• 94 App.run - where commandName is not null
• 101 App.run - where autoCompleteScript is null
• 144 Bashify.bashify - where c is '_'
• 147 Bashify.bashify - where c is space
• 154 EnumNameFunction - never called - TODO remove completely
• 167 BooleanArgFilter - Boolean / boolean
• 172 EnumArgFilter - never called - TODO remove completely
• 188 Predicate.and - never called - TODO remove completely
• 209 CommandDescriptor.equals - with unrelated object, same/different functionName/commandName
• 533 generateOptionsCases - can this be simplified? enumOptions only contains options with completions
• 538 generateOptionsCases - where option type is file or option type is java.nio.file.Path (may not be possible when only requiring Java 5 in this module)
• 568 complete - where spec, args or candidates is null
• 577 complete - where argIndex < 0 or >= args.length
• 578 complete - where positionInArg < 0 or >= args[argIndex].length()
• 592 complete - where subcommand found
• 600 complete - where subcommand not found and found option with attached separator =
• 609 complete - where did not find subcommand, option or positional
• 620 findCompletionStartPoint - where option has arity=2
• 640 findCommandFor(ArgSpec)
• 654 findCommandFor(PositionalParamSpec) - where the specified Positional is part of the specified CommandSpec
• 663 isPicocliModelObject
• 677 addCandidatesForArgsFollowing(Object) - where obj is null
• 677 addCandidatesForArgsFollowing(Object) - where obj is a PositionalParamSpec
• 677 addCandidatesForArgsFollowing(Object) - where obj is neither an OptionSpec nor a PositionalParamSpec
• 687 addCandidatesForArgsFollowing(CommandSpec) - where command is null
• 687 addCandidatesForArgsFollowing(OptionSpec) - where OptionSpec is null
• 687 addCandidatesForArgsFollowing(PositionalParamSpec) - where PositionalParamSpec is null