Improve test coverage

BusinessMonitor.MailTools.Test/BimiTests.cs

@@ -109,6 +109,17 @@ public void TestInvalidArguments()
             });
         }
 
+        [Test]
+        public void TestNotFound()
+        {
+            var check = new BimiCheck(new DummyResolver());
+
+            Assert.Throws<BimiNotFoundException>(() =>
+            {
+                check.GetBimiRecord("example.com");
+            });
+        }
+
         [Test]
         public void TestLookups()
         {

BusinessMonitor.MailTools.Test/DkimTests.cs

@@ -99,6 +99,17 @@ public void TestInvalidArguments()
             });
         }
 
+        [Test]
+        public void TestNotFound()
+        {
+            var check = new DkimCheck(new DummyResolver());
+
+            Assert.Throws<DkimNotFoundException>(() =>
+            {
+                check.GetDkimRecord("example.com", "test");
+            });
+        }
+
         [Test]
         public void TestRevoked()
         {

BusinessMonitor.MailTools.Test/DmarcTests.cs

@@ -108,6 +108,17 @@ public void TestInvalidArguments()
             });
         }
 
+        [Test]
+        public void TestNotFound()
+        {
+            var check = new DmarcCheck(new DummyResolver());
+
+            Assert.Throws<DmarcNotFoundException>(() =>
+            {
+                check.GetDmarcRecord("example.com");
+            });
+        }
+
         [Test]
         public void TestLookups()
         {

BusinessMonitor.MailTools/Dkim/DkimCheck.cs

@@ -137,9 +137,6 @@ public static DkimRecord ParseDkimRecord(string value)
                         }
 
                         break;
-
-                    default:
-                        break;
                 }
             }
 

BusinessMonitor.MailTools/Spf/SpfCheck.cs

@@ -260,9 +260,6 @@ private static SpfDirective ParseDirective(string qualifier, string mechanism, s
                     directive.Domain = value;
 
                     break;
-
-                default:
-                    break;
             }
 
             return directive;