add test coverage for subcommands

Author: rauhul

Tests/ArgumentParserUnitTests/HelpGenerationTests.swift

@@ -712,40 +712,42 @@ extension HelpGenerationTests {
 
 extension HelpGenerationTests {
  struct NonCustomUsage: ParsableCommand {
- static let configuration = CommandConfiguration()
+ struct ExampleSubcommand: ParsableCommand {
+ static let configuration = CommandConfiguration()
+ @Argument var output: String
+ }
+
+ static let configuration = CommandConfiguration(
+ subcommands: [ExampleSubcommand.self])
 
  @Argument var file: String
  @Flag var verboseMode = false
  }
 
  struct CustomUsageShort: ParsableCommand {
- static var configuration: CommandConfiguration {
- CommandConfiguration(usage: """
+ static let configuration = CommandConfiguration(
+ usage: """
  example [--verbose] <file-name>
  """)
- }
- 
+
  @Argument var file: String
  @Flag var verboseMode = false
  }
 
  struct CustomUsageLong: ParsableCommand {
- static var configuration: CommandConfiguration {
- CommandConfiguration(usage: """
+ static let configuration = CommandConfiguration(
+ usage: """
  example <file-name>
  example --verbose <file-name>
  example --help
  """)
- }
- 
+
  @Argument var file: String
  @Flag var verboseMode = false
  }
 
  struct CustomUsageHidden: ParsableCommand {
- static var configuration: CommandConfiguration {
- CommandConfiguration(usage: "")
- }
+ static let configuration = CommandConfiguration(usage: "")
 
  @Argument var file: String
  @Flag var verboseMode = false
@@ -755,14 +757,32 @@ extension HelpGenerationTests {
  AssertEqualStrings(
  actual: NonCustomUsage.helpMessage(columns: 80),
  expected: """
- USAGE: non-custom-usage <file> [--verbose-mode]
+ USAGE: non-custom-usage <file> [--verbose-mode] <subcommand>
 
  ARGUMENTS:
  <file>
 
  OPTIONS:
  --verbose-mode
  -h, --help Show help information.
+ 
+ SUBCOMMANDS:
+ example-subcommand
+
+ See 'non-custom-usage help <subcommand>' for detailed help.
+ """)
+
+ AssertEqualStrings(
+ actual: NonCustomUsage.helpMessage(
+ for: NonCustomUsage.ExampleSubcommand.self, columns: 80),
+ expected: """
+ USAGE: non-custom-usage example-subcommand <output>
+
+ ARGUMENTS:
+ <output>
+
+ OPTIONS:
+ -h, --help Show help information.
 
  """)
 
@@ -814,7 +834,7 @@ extension HelpGenerationTests {
  actual: NonCustomUsage.fullMessage(for: ValidationError("Test")),
  expected: """
  Error: Test
- Usage: non-custom-usage <file> [--verbose-mode]
+ Usage: non-custom-usage <file> [--verbose-mode] <subcommand>
  See 'non-custom-usage --help' for more information.
  """)
 
@@ -848,7 +868,14 @@ extension HelpGenerationTests {
  AssertEqualStrings(
  actual: NonCustomUsage.usageString(),
  expected: """
- non-custom-usage <file> [--verbose-mode]
+ non-custom-usage <file> [--verbose-mode] <subcommand>
+ """)
+
+ AssertEqualStrings(
+ actual: NonCustomUsage.usageString(
+ for: NonCustomUsage.ExampleSubcommand.self),
+ expected: """
+ non-custom-usage example-subcommand <output>
  """)
 
  AssertEqualStrings(