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package main
import "testing"
func TestStreamParserParseLine(t *testing.T) {
type tc struct {
name string
lines []string
want [][]streamEvent
}
tests := []tc{
{
name: "empty line",
lines: []string{""},
want: [][]streamEvent{nil},
},
{
name: "invalid json",
lines: []string{"not json"},
want: [][]streamEvent{nil},
},
{
name: "result event",
lines: []string{`{"type":"result","subtype":"success","cost_usd":0.001,"result":"hello"}`},
want: [][]streamEvent{{{Type: eventDone}}},
},
{
name: "system event ignored",
lines: []string{`{"type":"system","subtype":"init","cwd":"/tmp"}`},
want: [][]streamEvent{nil},
},
{
name: "rate limit event ignored",
lines: []string{`{"type":"rate_limit_event","rate_limit_info":{}}`},
want: [][]streamEvent{nil},
},
{
name: "assistant text extracted",
lines: []string{
`{"type":"assistant","message":{"content":[{"type":"text","text":"Hello"}]}}`,
},
want: [][]streamEvent{
{{Type: eventText, Text: "Hello"}},
},
},
{
name: "assistant text delta across two events",
lines: []string{
`{"type":"assistant","message":{"content":[{"type":"text","text":"Hel"}]}}`,
`{"type":"assistant","message":{"content":[{"type":"text","text":"Hello world"}]}}`,
},
want: [][]streamEvent{
{{Type: eventText, Text: "Hel"}},
{{Type: eventText, Text: "lo world"}},
},
},
{
name: "thinking blocks ignored",
lines: []string{
`{"type":"assistant","message":{"content":[{"type":"thinking","thinking":"let me think"}]}}`,
},
want: [][]streamEvent{nil},
},
{
name: "tool use extracted once",
lines: []string{
`{"type":"assistant","message":{"content":[{"type":"tool_use","name":"Bash"}]}}`,
`{"type":"assistant","message":{"content":[{"type":"tool_use","name":"Bash"}]}}`,
},
want: [][]streamEvent{
{{Type: eventToolUse, Text: "Bash"}},
nil,
},
},
{
name: "mixed content blocks",
lines: []string{
`{"type":"assistant","message":{"content":[{"type":"text","text":"I'll run a command"},{"type":"tool_use","name":"Edit"}]}}`,
},
want: [][]streamEvent{
{
{Type: eventText, Text: "I'll run a command"},
{Type: eventToolUse, Text: "Edit"},
},
},
},
{
name: "no delta when text unchanged",
lines: []string{
`{"type":"assistant","message":{"content":[{"type":"text","text":"same"}]}}`,
`{"type":"assistant","message":{"content":[{"type":"text","text":"same"}]}}`,
},
want: [][]streamEvent{
{{Type: eventText, Text: "same"}},
nil,
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
p := newStreamParser()
for i, line := range tt.lines {
got := p.parseLine([]byte(line))
want := tt.want[i]
if want == nil {
if len(got) != 0 {
t.Fatalf("line %d: expected nil, got %+v", i, got)
}
continue
}
if len(got) != len(want) {
t.Fatalf("line %d: got %d events, want %d\ngot: %+v\nwant: %+v", i, len(got), len(want), got, want)
}
for j := range want {
if got[j].Type != want[j].Type {
t.Fatalf("line %d event %d: type = %d, want %d", i, j, got[j].Type, want[j].Type)
}
if got[j].Text != want[j].Text {
t.Fatalf("line %d event %d: text = %q, want %q", i, j, got[j].Text, want[j].Text)
}
}
}
})
}
}
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