1 files changed, 102 insertions, 0 deletions
diff --git a/packages/app/src/context/global-sync/session-cache.test.ts b/packages/app/src/context/global-sync/session-cache.test.ts
new file mode 100644
index 000000000..8e11110e3
--- /dev/null
+++ b/packages/app/src/context/global-sync/session-cache.test.ts
@@ -0,0 +1,102 @@
+import { describe, expect, test } from "bun:test"
+import type {
+  FileDiff,
+  Message,
+  Part,
+  PermissionRequest,
+  QuestionRequest,
+  SessionStatus,
+  Todo,
+} from "@opencode-ai/sdk/v2/client"
+import { dropSessionCaches, pickSessionCacheEvictions } from "./session-cache"
+
+const msg = (id: string, sessionID: string) =>
+  ({
+    id,
+    sessionID,
+    role: "user",
+    time: { created: 1 },
+    agent: "assistant",
+    model: { providerID: "openai", modelID: "gpt" },
+  }) as Message
+
+const part = (id: string, sessionID: string, messageID: string) =>
+  ({
+    id,
+    sessionID,
+    messageID,
+    type: "text",
+    text: id,
+  }) as Part
+
+describe("app session cache", () => {
+  test("dropSessionCaches clears orphaned parts without message rows", () => {
+    const store: {
+      session_status: Record<string, SessionStatus | undefined>
+      session_diff: Record<string, FileDiff[] | undefined>
+      todo: Record<string, Todo[] | undefined>
+      message: Record<string, Message[] | undefined>
+      part: Record<string, Part[] | undefined>
+      permission: Record<string, PermissionRequest[] | undefined>
+      question: Record<string, QuestionRequest[] | undefined>
+    } = {
+      session_status: { ses_1: { type: "busy" } as SessionStatus },
+      session_diff: { ses_1: [] },
+      todo: { ses_1: [] as Todo[] },
+      message: {},
+      part: { msg_1: [part("prt_1", "ses_1", "msg_1")] },
+      permission: { ses_1: [] as PermissionRequest[] },
+      question: { ses_1: [] as QuestionRequest[] },
+    }
+
+    dropSessionCaches(store, ["ses_1"])
+
+    expect(store.message.ses_1).toBeUndefined()
+    expect(store.part.msg_1).toBeUndefined()
+    expect(store.todo.ses_1).toBeUndefined()
+    expect(store.session_diff.ses_1).toBeUndefined()
+    expect(store.session_status.ses_1).toBeUndefined()
+    expect(store.permission.ses_1).toBeUndefined()
+    expect(store.question.ses_1).toBeUndefined()
+  })
+
+  test("dropSessionCaches clears message-backed parts", () => {
+    const m = msg("msg_1", "ses_1")
+    const store: {
+      session_status: Record<string, SessionStatus | undefined>
+      session_diff: Record<string, FileDiff[] | undefined>
+      todo: Record<string, Todo[] | undefined>
+      message: Record<string, Message[] | undefined>
+      part: Record<string, Part[] | undefined>
+      permission: Record<string, PermissionRequest[] | undefined>
+      question: Record<string, QuestionRequest[] | undefined>
+    } = {
+      session_status: {},
+      session_diff: {},
+      todo: {},
+      message: { ses_1: [m] },
+      part: { [m.id]: [part("prt_1", "ses_1", m.id)] },
+      permission: {},
+      question: {},
+    }
+
+    dropSessionCaches(store, ["ses_1"])
+
+    expect(store.message.ses_1).toBeUndefined()
+    expect(store.part[m.id]).toBeUndefined()
+  })
+
+  test("pickSessionCacheEvictions preserves requested sessions", () => {
+    const seen = new Set(["ses_1", "ses_2", "ses_3"])
+
+    const stale = pickSessionCacheEvictions({
+      seen,
+      keep: "ses_4",
+      limit: 2,
+      preserve: ["ses_1"],
+    })
+
+    expect(stale).toEqual(["ses_2", "ses_3"])
+    expect([...seen]).toEqual(["ses_1", "ses_4"])
+  })
+})