CoreDataUnitTest_entity.swift

func test_imageEntity_properties() throws {
    // Assert non nil value, and unwrap it.
    let entity = try XCTUnwrap(
        CoreDataStore.model?.entitiesByName["Name of Entity"]
    )

    entity.verify(attribute: "id", hasType: .UUIDAttributeType, isOptional: false)
    entity.verify(attribute: "description", hasType: .stringAttributeType, isOptional: true)
    entity.verify(attribute: "url", hasType: .URIAttributeType, isOptional: false)
}

extension NSEntityDescription {
	func verify(attribute name: String, hasType type: NSAttributeType, isOptional: Bool, file: StaticString = #filePath, line: UInt = #line) {
		guard let attribute = attributesByName[name] else {
			XCTFail("Missing expected attribute \(name)", file: file, line: line)
			return
		}

		guard let property = propertiesByName[name] else {
			XCTFail("Missing expected property \(name)", file: file, line: line)
			return
		}

		XCTAssertEqual(attribute.attributeType, type, "attributeType", file: file, line: line)
		XCTAssertEqual(property.isOptional, isOptional, "isOptional", file: file, line: line)
	}
}