1import { assert, it } from "@effect/vitest";
2import { ProviderDriverKind, ProviderInstanceId } from "@t3tools/contracts";
3
4import { decideProviderSessionTransition } from "./ProviderSessionTransitionPolicy.ts";
5
6const driver = ProviderDriverKind.make("codex");
7const instanceId = ProviderInstanceId.make("codex");
8const base = {
9 driver,
10 continuationIdentity: { driverKind: driver, continuationKey: "codex:account:one" },
11 modelSelection: { instanceId, model: "gpt-5.1-codex" },
12 runtimeMode: "full-access" as const,
13 interactionMode: "default" as const,
14 workspace: "/repo",
15};
16
17it("reuses compatible sessions and treats interaction mode as turn-scoped", () => {
18 assert.deepEqual(
19 decideProviderSessionTransition({
20 current: base,
21 target: { ...base, interactionMode: "plan", available: true },
22 }),
23 { type: "reuse" },
24 );
25});
26
27it("uses the adapter's selection transition classification", () => {
28 assert.deepEqual(
29 decideProviderSessionTransition({
30 current: base,
31 target: {
32 ...base,
33 modelSelection: { ...base.modelSelection, model: "gpt-5.2-codex" },
34 available: true,
35 },
36 selectionTransition: { type: "apply_on_next_turn" },
37 }),
38 { type: "switch_model_in_session" },
39 );
40 assert.deepEqual(
41 decideProviderSessionTransition({
42 current: {
43 ...base,
44 },
45 target: {
46 ...base,
47 modelSelection: { ...base.modelSelection, model: "gpt-5.2-codex" },
48 available: true,
49 },
50 selectionTransition: { type: "restart_session" },
51 }),
52 { type: "restart_and_resume" },
53 );
54});
55
56it("restarts compatible instances for workspace or runtime changes", () => {
57 assert.deepEqual(
58 decideProviderSessionTransition({
59 current: base,
60 target: { ...base, workspace: "/other", available: true },
61 }),
62 { type: "restart_and_resume" },
63 );
64});
65
66it("preserves handoff and missing-classification outcomes across workspace changes", () => {
67 const target = {
68 ...base,
69 modelSelection: { ...base.modelSelection, model: "gpt-5.2-codex" },
70 workspace: "/other",
71 available: true,
72 };
73 assert.deepEqual(
74 decideProviderSessionTransition({
75 current: base,
76 target,
77 selectionTransition: { type: "create_with_handoff" },
78 }),
79 { type: "create_with_handoff" },
80 );
81 assert.deepEqual(decideProviderSessionTransition({ current: base, target }), {
82 type: "reject",
83 reason: "The provider adapter did not classify the selection change.",
84 });
85});
86
87it("uses portable handoff for incompatible continuation identities", () => {
88 assert.deepEqual(
89 decideProviderSessionTransition({
90 current: base,
91 target: {
92 ...base,
93 modelSelection: {
94 ...base.modelSelection,
95 instanceId: ProviderInstanceId.make("codex_other"),
96 },
97 continuationIdentity: { driverKind: driver, continuationKey: "codex:account:other" },
98 available: true,
99 },
100 }),
101 { type: "create_with_handoff" },
102 );
103});