add unit test

Author: agentschmitt

src/Samhammer.Options.Test/OptionsResolverTest.cs

@@ -68,6 +68,17 @@ public void OptionsFromConfiguration()
             result.Value.Should().BeEquivalentTo(expected);
         }
 
+        [Fact]
+        public void OptionsFromConfiguration_MissingSection()
+        {
+            services.ResolveOptions(Configuration);
+
+            var result = ServiceProvider.GetService<IOptions<TestOptions>>();
+            var expected = new TestOptions();
+
+            result.Value.Should().BeEquivalentTo(expected);
+        }
+
         [Fact]
         public void OptionsFromConfigurationAndCode()
         {