fix: Tests for new guards

Author: linkdotnet

tests/LinkDotNet.Blog.UnitTests/Domain/ProfileInformationEntryTests.cs

@@ -22,7 +22,7 @@ public void ShouldThrowExceptionWhenEmptyKeyOrValue(string content)
     {
         Action act = () => ProfileInformationEntry.Create(content, 0);
 
-        act.Should().Throw<ArgumentNullException>();
+        act.Should().Throw<ArgumentException>();
     }
 
     [Fact]

tests/LinkDotNet.Blog.UnitTests/Domain/SkillTests.cs

@@ -24,7 +24,7 @@ public void ShouldThrowWhenWhitespaceName(string name)
     {
         Action result = () => Skill.Create(name, "url", "backend", ProficiencyLevel.Expert.Key);
 
-        result.Should().Throw<ArgumentNullException>();
+        result.Should().Throw<ArgumentException>();
     }
 
     [Theory]
@@ -35,7 +35,7 @@ public void ShouldThrowWhenWhitespaceCapability(string capability)
     {
         Action result = () => Skill.Create("name", "url", capability, ProficiencyLevel.Expert.Key);
 
-        result.Should().Throw<ArgumentNullException>();
+        result.Should().Throw<ArgumentException>();
     }
 
     [Fact]

tests/LinkDotNet.Blog.UnitTests/Domain/TagTests.cs

@@ -21,6 +21,6 @@ public void ShouldThrowExceptionIfInvalid(string content)
     {
         Action act = () => Tag.Create(content);
 
-        act.Should().Throw<ArgumentNullException>();
+        act.Should().Throw<ArgumentException>();
     }
 }