test(tui): add tier 1 unit tests for pure logic functions

Cover search filtering, intent matching, card affordances, checklist
parsing, template slot discovery/resolve, date grouping, and truncation.

internal/tui/run_test.go

@@ -0,0 +1,65 @@
+package tui
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+func TestParseChecklist(t *testing.T) {
+	tests := []struct {
+		name     string
+		cardData *string
+		wantLen  int
+	}{
+		{"nil data", nil, 0},
+		{"empty JSON", ptr("{}"), 0},
+		{"malformed JSON", ptr("{bad"), 0},
+		{"valid steps", ptr(`{"steps":[{"text":"step 1","done":false},{"text":"step 2","done":true}]}`), 2},
+		{"empty steps array", ptr(`{"steps":[]}`), 0},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := parseChecklist(tt.cardData)
+			if len(got) != tt.wantLen {
+				t.Fatalf("parseChecklist() returned %d steps, want %d", len(got), tt.wantLen)
+			}
+		})
+	}
+}
+
+func TestParseChecklist_PreservesDoneState(t *testing.T) {
+	data := `{"steps":[{"text":"first","done":false},{"text":"second","done":true}]}`
+	steps := parseChecklist(&data)
+	if steps[0].Done {
+		t.Fatal("step 0 should not be done")
+	}
+	if !steps[1].Done {
+		t.Fatal("step 1 should be done")
+	}
+	if steps[0].Text != "first" || steps[1].Text != "second" {
+		t.Fatalf("texts wrong: %q, %q", steps[0].Text, steps[1].Text)
+	}
+}
+
+func TestDoneCount(t *testing.T) {
+	r := newRunModel("id", ptr(`{"steps":[{"label":"a","done":true},{"label":"b","done":false},{"label":"c","done":true}]}`))
+	if got := r.doneCount(); got != 2 {
+		t.Fatalf("doneCount() = %d, want 2", got)
+	}
+}
+
+func TestStepsJSON_Roundtrip(t *testing.T) {
+	r := newRunModel("id", ptr(`{"steps":[{"text":"test","done":false}]}`))
+	out := r.stepsJSON()
+
+	var parsed struct {
+		Steps []runStep `json:"steps"`
+	}
+	if err := json.Unmarshal([]byte(out), &parsed); err != nil {
+		t.Fatalf("stepsJSON() produced invalid JSON: %v", err)
+	}
+	if len(parsed.Steps) != 1 || parsed.Steps[0].Text != "test" {
+		t.Fatalf("roundtrip failed: %+v", parsed.Steps)
+	}
+}