diff --git a/Tests/OpenAPIKit30ErrorReportingTests/DocumentErrorTests.swift b/Tests/OpenAPIKit30ErrorReportingTests/DocumentErrorTests.swift
index 919c52132..30cedeff6 100644
--- a/Tests/OpenAPIKit30ErrorReportingTests/DocumentErrorTests.swift
+++ b/Tests/OpenAPIKit30ErrorReportingTests/DocumentErrorTests.swift
@@ -26,6 +26,7 @@ final class DocumentErrorTests: XCTestCase {
             let openAPIError = OpenAPI.Error(from: error)
 
             XCTAssertEqual(openAPIError.localizedDescription, "Expected to find `openapi` key in the root Document object but it is missing.")
+            XCTAssertEqual(openAPIError.localizedDescription, openAPIError.description)
             XCTAssertEqual(openAPIError.codingPath.map { $0.stringValue }, [])
         }
     }
diff --git a/Tests/OpenAPIKit30Tests/Document/DereferencedDocumentTests.swift b/Tests/OpenAPIKit30Tests/Document/DereferencedDocumentTests.swift
index d46449530..a1ea8115e 100644
--- a/Tests/OpenAPIKit30Tests/Document/DereferencedDocumentTests.swift
+++ b/Tests/OpenAPIKit30Tests/Document/DereferencedDocumentTests.swift
@@ -28,14 +28,17 @@ final class DereferencedDocumentTests: XCTestCase {
             servers: [.init(url: URL(string: "http://website.com")!)],
             paths: [
                 "/hello/world": .init(
+                    servers: [.init(urlTemplate: URLTemplate(rawValue: "http://{domain}.com")!, variables: ["domain": .init(default: "other")])],
                     get: .init(
+                        operationId: "hi",
                         responses: [
                             200: .response(description: "success")
                         ]
                     )
                 )
             ],
-            components: .noComponents
+            components: .noComponents,
+            tags: ["hi"]
         ).locallyDereferenced()
 
         XCTAssertEqual(t1.paths.count, 1)
@@ -51,6 +54,13 @@ final class DereferencedDocumentTests: XCTestCase {
             t1.resolvedEndpointsByPath().keys,
             ["/hello/world"]
         )
+      
+        XCTAssertEqual(t1.allOperationIds, ["hi"])
+        XCTAssertEqual(t1.allServers, [
+          .init(url: URL(string: "http://website.com")!),
+          .init(urlTemplate: URLTemplate(rawValue: "http://{domain}.com")!, variables: ["domain": .init(default: "other")]),
+        ])
+        XCTAssertEqual(t1.allTags, ["hi"])
     }
 
     func test_noSecurityReferencedResponseInPath() throws {
diff --git a/Tests/OpenAPIKit30Tests/Validator/ValidatorTests.swift b/Tests/OpenAPIKit30Tests/Validator/ValidatorTests.swift
index bc3d4555d..c96acc1cf 100644
--- a/Tests/OpenAPIKit30Tests/Validator/ValidatorTests.swift
+++ b/Tests/OpenAPIKit30Tests/Validator/ValidatorTests.swift
@@ -1444,6 +1444,12 @@ final class ValidatorTests: XCTestCase {
             "Inconsistency encountered when parsing ``: \'gzip\' could not be parsed as a Content Type. Content Types should have the format \'<type>/<subtype>\'."
         )
         XCTAssertEqual(warnings.first?.codingPathString, ".paths[\'/test\'].get.responses.200.content")
+        XCTAssertNotNil(warnings.first?.underlyingError)
+        XCTAssertNotNil(warnings.first?.errorCategory)
+        XCTAssertEqual(warnings.first?.subjectName, "")
+        XCTAssertEqual(warnings.first?.contextString, "")
+
+        XCTAssertEqual(warnings.first?.localizedDescription, warnings.first?.description)
     }
 
     func test_collectsContentTypeWarningStrict() throws {
diff --git a/Tests/OpenAPIKitCoreTests/CallbackURLTests.swift b/Tests/OpenAPIKitCoreTests/CallbackURLTests.swift
index 15fe508ae..01f975b70 100644
--- a/Tests/OpenAPIKitCoreTests/CallbackURLTests.swift
+++ b/Tests/OpenAPIKitCoreTests/CallbackURLTests.swift
@@ -9,7 +9,7 @@ import OpenAPIKitCore
 import XCTest
 
 final class CallbackURLTests: XCTestCase {
-    func testInit() {
+    func test_init() {
         let plainUrl = Shared.CallbackURL(url: URL(string: "https://hello.com")!)
         XCTAssertEqual(plainUrl.url, URL(string: "https://hello.com")!)
         XCTAssertEqual(plainUrl.template.variables.count, 0)
@@ -19,7 +19,7 @@ final class CallbackURLTests: XCTestCase {
         XCTAssertEqual(templateUrl?.template.variables, ["$request.path.id"])
     }
 
-    func testEncode() throws {
+    func test_encode() throws {
         let url = Shared.CallbackURL(rawValue: "https://hello.com/item/{$request.path.id}")
 
         let result = try orderUnstableTestStringFromEncoding(of: url)
@@ -32,7 +32,7 @@ final class CallbackURLTests: XCTestCase {
         )
     }
 
-    func testDecode() throws {
+    func test_decode() throws {
         let json = #""https://hello.com/item/{$request.path.id}""#
         let data = json.data(using: .utf8)!
 
diff --git a/Tests/OpenAPIKitCoreTests/ComponentKeyTests.swift b/Tests/OpenAPIKitCoreTests/ComponentKeyTests.swift
new file mode 100644
index 000000000..0236e9ee0
--- /dev/null
+++ b/Tests/OpenAPIKitCoreTests/ComponentKeyTests.swift
@@ -0,0 +1,40 @@
+//
+//  ComponentKeyTests.swift
+//  OpenAPIKit
+//
+//  Created by Mathew Polzin on 2/16/25.
+//
+
+import OpenAPIKitCore
+import XCTest
+
+final class ComponentKeyTests: XCTestCase {
+    func test_init() throws {
+        let t1 : Shared.ComponentKey = "abcd"
+        XCTAssertEqual(t1.rawValue, "abcd")
+
+        let t2 = Shared.ComponentKey(rawValue: "abcd")
+        XCTAssertEqual(t2?.rawValue, "abcd")
+
+        let t3 = Shared.ComponentKey(rawValue: "")
+        XCTAssertNil(t3)
+
+        let t4 = Shared.ComponentKey(rawValue: "(abcd)")
+        XCTAssertNil(t4)
+
+        let t5 = try Shared.ComponentKey.forceInit(rawValue: "abcd")
+        XCTAssertEqual(t5.rawValue, "abcd")
+
+        XCTAssertThrowsError(try Shared.ComponentKey.forceInit(rawValue: nil))
+        XCTAssertThrowsError(try Shared.ComponentKey.forceInit(rawValue: "(abcd)"))
+    }
+
+    func test_problemString() {
+        let message = Shared.ComponentKey.problem(with: "(abcd)")
+
+        XCTAssertEqual(message, "Keys for components in the Components Object must conform to the regex `^[a-zA-Z0-9\\.\\-_]+$`. '(abcd)' does not..")
+
+        let nonProblem = Shared.ComponentKey.problem(with: "abcd")
+        XCTAssertNil(nonProblem)
+    }
+}
diff --git a/Tests/OpenAPIKitTests/Document/DereferencedDocumentTests.swift b/Tests/OpenAPIKitTests/Document/DereferencedDocumentTests.swift
index 941db1093..678223292 100644
--- a/Tests/OpenAPIKitTests/Document/DereferencedDocumentTests.swift
+++ b/Tests/OpenAPIKitTests/Document/DereferencedDocumentTests.swift
@@ -28,14 +28,17 @@ final class DereferencedDocumentTests: XCTestCase {
             servers: [.init(url: URL(string: "http://website.com")!)],
             paths: [
                 "/hello/world": .init(
+                  servers: [.init(urlTemplate: URLTemplate(rawValue: "http://{domain}.com")!, variables: ["domain": .init(default: "other")])],
                     get: .init(
+                        operationId: "hi",
                         responses: [
                             200: .response(description: "success")
                         ]
                     )
                 )
             ],
-            components: .noComponents
+            components: .noComponents,
+            tags: ["hi"]
         ).locallyDereferenced()
 
         XCTAssertEqual(t1.paths.count, 1)
@@ -51,6 +54,13 @@ final class DereferencedDocumentTests: XCTestCase {
             t1.resolvedEndpointsByPath().keys,
             ["/hello/world"]
         )
+
+        XCTAssertEqual(t1.allOperationIds, ["hi"])
+        XCTAssertEqual(t1.allServers, [
+            .init(url: URL(string: "http://website.com")!),
+            .init(urlTemplate: URLTemplate(rawValue: "http://{domain}.com")!, variables: ["domain": .init(default: "other")]),
+        ])
+        XCTAssertEqual(t1.allTags, ["hi"])
     }
 
     func test_noSecurityReferencedResponseInPath() throws {