Update boolean and required property assertions in tests

Replaces Assert.Equal with Assert.True/Assert.False for boolean properties and adds type checks for NotNull assertions on required properties in ModelTests.cs.twig. Improves accuracy and clarity of generated test code.

Author: Fellmonkey

templates/dotnet/Package.Tests/Models/ModelTests.cs.twig

@@ -64,9 +64,9 @@ namespace {{ spec.title | caseUcfirst }}.Tests.Models
             Assert.Equal("{{ property['x-example'] | default('test') | escapeCsString }}", model.{{ property_name(definition, property) | overrideProperty(definition.name) }});
             {%~ elseif property.type == 'boolean' %}
             {%~ if property['x-example'] is defined %}
-            Assert.Equal({% if property['x-example'] is same as(true) or property['x-example'] == 'true' or property['x-example'] == 1 %}true{% else %}false{% endif %}, model.{{ property_name(definition, property) | overrideProperty(definition.name) }});
+            Assert.{% if property['x-example'] is same as(true) or property['x-example'] == 'true' or property['x-example'] == 1 %}True{% else %}False{% endif %}(model.{{ property_name(definition, property) | overrideProperty(definition.name) }});
             {%~ else %}
-            Assert.Equal(true, model.{{ property_name(definition, property) | overrideProperty(definition.name) }});
+            Assert.True(model.{{ property_name(definition, property) | overrideProperty(definition.name) }});
             {%~ endif %}
             {%~ elseif property.type == 'integer' or property.type == 'number' %}
             Assert.Equal({{ property['x-example'] | default(1) }}, model.{{ property_name(definition, property) | overrideProperty(definition.name) }});
@@ -163,7 +163,9 @@ namespace {{ spec.title | caseUcfirst }}.Tests.Models
             // Assert
             Assert.NotNull(model);
             {%~ for property in definition.properties | filter(p => p.required) %}
+            {%~ if property.type == 'string' or property.type == 'array' or property.type == 'object' or property.sub_schema or property.enum %}
             Assert.NotNull(model.{{ property_name(definition, property) | overrideProperty(definition.name) }});
+            {%~ endif %}
             {%~ endfor %}
         }