refactor(server): split HttpApi exercise harness (#26385)

packages/opencode/test/server/httpapi-exercise/assertions.ts

@@ -0,0 +1,64 @@
+import type { CallResult, JsonObject } from "./types"
+
+export function parse(text: string): unknown {
+  if (!text) return undefined
+  try {
+    return JSON.parse(text) as unknown
+  } catch {
+    return text
+  }
+}
+
+export function looksJson(result: CallResult) {
+  return result.contentType.includes("application/json") || result.text.startsWith("{") || result.text.startsWith("[")
+}
+
+export function stable(value: unknown): string {
+  return JSON.stringify(sort(value))
+}
+
+function sort(value: unknown): unknown {
+  if (Array.isArray(value)) return value.map(sort)
+  if (!value || typeof value !== "object") return value
+  return Object.fromEntries(
+    Object.entries(value)
+      .sort(([left], [right]) => left.localeCompare(right))
+      .map(([key, item]) => [key, sort(item)]),
+  )
+}
+
+export function array(value: unknown): asserts value is unknown[] {
+  if (!Array.isArray(value)) throw new Error("expected array")
+}
+
+export function object(value: unknown): asserts value is JsonObject {
+  if (!value || typeof value !== "object" || Array.isArray(value)) throw new Error("expected object")
+}
+
+export function boolean(value: unknown): asserts value is boolean {
+  if (typeof value !== "boolean") throw new Error("expected boolean")
+}
+
+export function isRecord(value: unknown): value is JsonObject {
+  return !!value && typeof value === "object" && !Array.isArray(value)
+}
+
+export function check(value: boolean, message: string): asserts value {
+  if (!value) throw new Error(message)
+}
+
+export function message(error: unknown) {
+  if (error instanceof Error) return error.message
+  return String(error)
+}
+
+export function pad(value: string, size: number) {
+  return value.length >= size ? value : value + " ".repeat(size - value.length)
+}
+
+export function indent(value: string) {
+  return value
+    .split("\n")
+    .map((line) => `  ${line}`)
+    .join("\n")
+}