wantValid: false,
	}, {
		in: []sparseEntry{{1, 3}, {2, 2}}, size: 10,
		wantValid: false,
	}}

	for i, v := range vectors {
		gotValid := validateSparseEntries(v.in, v.size)
		if gotValid != v.wantValid {
			t.Errorf("test %d, validateSparseEntries() = %v, want %v", i, gotValid, v.wantValid)
		}
		if !v.wantValid {
			continue
		}
		gotAligned := alignSparseEntries(append([]sparseEntry{}, v.in...), v.size)