test: missing XSD test coverage for constraints and content parsing

[Ishita-190]

Current Coverage: 75.78%

Uncovered Lines and Missing Test Scenarios

Files references: src/models/XsdSchema.ts and test/processors/XsdInputProcessor.spec.ts

---

1. Simple Type Constraints

Lines: 201, 266–270, 277–281

Missing tests for:

• Simple content parsing (parseSimpleContent)
• Complex content with extensions (parseComplexContent)
• Simple type parsing within elements (parseSimpleType)

Test files needed:

<!-- simple-content.xsd -->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:complexType name="PersonType">
    <xs:simpleContent>
      <xs:extension base="xs:string">
        <xs:attribute name="id" type="xs:int"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
</xs:schema>

<!-- complex-content.xsd -->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:complexType name="ExtendedPerson">
    <xs:complexContent>
      <xs:extension base="xs:string">
        <xs:sequence>
          <xs:element name="address" type="xs:string"/>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
</xs:schema>

---

2. Pattern and Length Constraints

Lines: 337–342, 349–365

Missing tests for:

• Pattern restrictions (xs:pattern)
• Minimum and maximum length constraints (xs:minLength, xs:maxLength)

Test files needed:

<!-- pattern-restrictions.xsd -->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:simpleType name="EmailType">
    <xs:restriction base="xs:string">
      <xs:pattern value="[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}"/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="PasswordType">
    <xs:restriction base="xs:string">
      <xs:minLength value="8"/>
      <xs:maxLength value="128"/>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>

---

3. Numeric Constraints

Lines: 369–389

Missing tests for:

• Inclusive constraints (xs:minInclusive, xs:maxInclusive)
• Exclusive constraints (xs:minExclusive, xs:maxExclusive)

Test files needed:

<!-- numeric-constraints.xsd -->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:simpleType name="AgeType">
    <xs:restriction base="xs:int">
      <xs:minInclusive value="0"/>
      <xs:maxInclusive value="150"/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="PercentageType">
    <xs:restriction base="xs:decimal">
      <xs:minInclusive value="0"/>
      <xs:maxInclusive value="100"/>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>

---

4. Attribute Parsing

Lines: 400–412

Missing tests for:

• Attributes with default values (@_default)
• Fixed attributes (@_fixed)
• Prohibited attributes (use="prohibited")

Test files needed:

<!-- advanced-attributes.xsd -->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:complexType name="ProductType">
    <xs:sequence>
      <xs:element name="name" type="xs:string"/>
    </xs:sequence>
    <xs:attribute name="id" type="xs:string" use="required"/>
    <xs:attribute name="status" type="xs:string" default="active"/>
    <xs:attribute name="version" type="xs:string" fixed="1.0"/>
    <xs:attribute name="deprecated" type="xs:boolean" use="prohibited"/>
  </xs:complexType>
</xs:schema>

---

Adding targeted tests for the above cases would significantly improve XSD coverage from ~75.78% to ~90%+

Steps to Reproduce:

• npm run test:library
• start coverage/lcov-report/index.html
• click on src/models and navigate to XsdSchema.ts

[Ruchip16]

@Ishita-190 thanks for raising this issue.
I will work on this issue If the bounty gets approved I will implement this and work on this one. ref - https://github.com/orgs/asyncapi/discussions/2279#discussioncomment-15755939