Add'l testing

Author: natecook1000

Tests/ArgumentParserExampleTests/CountLinesExampleTests.swift

@@ -37,6 +37,26 @@ final class CountLinesExampleTests: XCTestCase {
         """
     try AssertExecuteCommand(command: "count-lines -h", expected: helpText)
   }
+  
+  @available(macOS 12, *)
+  func testPrintEnv() throws {
+    let process = Process()
+    process.launchPath = "/usr/bin/env"
+    
+    let output = Pipe()
+    process.standardOutput = output
+
+    try! process.run()
+    process.waitUntilExit()
+    
+    let outputActual = String(
+      data: output.fileHandleForReading.readDataToEndOfFile(),
+      encoding: .utf8)!
+    print("ENV:")
+    print(outputActual)
+    
+    XCTFail()
+  }
 }
 
 #endif