feat: Add validation to ensure the ExpiryDate comes after the Created…

…Date.

feat: Add validation to ensure the Author has been updated from the default template value.

src/CSharpClasses/tiPSClasses/PowerShellTip.cs

@@ -122,6 +122,20 @@ public void Validate()
 					throw new ArgumentException("The Urls property value '" + url + "' is not a valid URL.");
 				}
 			}
+
+			if (ExpiryDate <= CreatedDate)
+			{
+				throw new ArgumentException("The ExpiryDate property value must be greater than the CreatedDate property value.");
+			}
+
+			if (!string.IsNullOrWhiteSpace(Author))
+			{
+				// Ensure the Author is not the default value from the template often used to create new tips.
+				if (string.Equals(Author, "Your name and/or username", StringComparison.OrdinalIgnoreCase))
+				{
+					throw new ArgumentException("The Author property value must be set to your name and/or username, or left blank.");
+				}
+			}
 		}
 	}
 }

src/tiPS/Classes/PowerShellTip.Tests.ps1

@@ -143,6 +143,18 @@ Describe 'Validating a PowerShellTip' {
 			[tiPS.PowerShellTip] $tip = $ValidTip
 			{ $tip.Category = 'InvalidCategory' } | Should -Throw
 		}
+
+		It 'Should throw an error when the ExpiryDate is before the CreatedDate' {
+			[tiPS.PowerShellTip] $tip = $ValidTip
+			$tip.ExpiryDate = [DateTime]::Parse('2020-01-15')
+			{ $tip.Validate() } | Should -Throw
+		}
+
+		It 'Should throw an error when the Author is the default template value' {
+			[tiPS.PowerShellTip] $tip = $ValidTip
+			$tip.Author = 'Your name and/or username'
+			{ $tip.Validate() } | Should -Throw
+		}
 	}
 
 	Context 'Given the PowerShellTip has all valid properties' {