test(calendar): add unit tests for dedupeCalendarTargets and collectCalendarInputs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: salmonumbrella

internal/cmd/calendar_selection_test.go

@@ -0,0 +1,50 @@
+package cmd
+
+import (
+	"testing"
+)
+
+func TestDedupeCalendarTargets(t *testing.T) {
+	tests := []struct {
+		name   string
+		input  []string
+		expect []string
+	}{
+		{"empty", nil, nil},
+		{"single", []string{"cal@example.com"}, []string{"cal@example.com"}},
+		{"dedup", []string{"a@b.com", "a@b.com"}, []string{"a@b.com"}},
+		{"primary normalization", []string{"primary", "Primary", "PRIMARY"}, []string{"primary"}},
+		{"mixed", []string{"a@b.com", "primary", "c@d.com", "a@b.com"}, []string{"a@b.com", "primary", "c@d.com"}},
+		{"whitespace", []string{" a@b.com ", "", "  "}, []string{"a@b.com"}},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := dedupeCalendarTargets(tt.input)
+			if len(got) == 0 && len(tt.expect) == 0 {
+				return
+			}
+			if len(got) != len(tt.expect) {
+				t.Fatalf("expected %v, got %v", tt.expect, got)
+			}
+			for i := range got {
+				if got[i] != tt.expect[i] {
+					t.Fatalf("at index %d: expected %q, got %q", i, tt.expect[i], got[i])
+				}
+			}
+		})
+	}
+}
+
+func TestCollectCalendarInputs(t *testing.T) {
+	got := collectCalendarInputs([]string{"a", "b"}, "c,d")
+	if len(got) != 4 || got[0] != "a" || got[1] != "b" || got[2] != "c" || got[3] != "d" {
+		t.Fatalf("unexpected: %#v", got)
+	}
+}
+
+func TestCollectCalendarInputs_EmptyCalendars(t *testing.T) {
+	got := collectCalendarInputs([]string{"a"}, "")
+	if len(got) != 1 || got[0] != "a" {
+		t.Fatalf("unexpected: %#v", got)
+	}
+}