Proof may be made by testimony:
1. Of all facts concerning commercial matters;
2. In all matters in which the principal sum of money or value in question does not exceed $1 000;
3. In the case of a lease by sufferance as provided in article 1634;
4. In cases of necessary deposits, or deposits made by travellers in an inn, and in other cases of a like nature;
5. In cases of obligations arising from quasi-contracts, offences and quasi-offences, and all other cases in which the party claiming could not procure proof in writing;
6. In cases in which the proof in writing has been lost by unforeseen accident, or is in the possession of the adverse party or of a third person without collusion of the party claiming, and cannot be produced;
7. In cases in which there is a commencement of proof in writing.
In all other matters proof must be made by writing or by the oath of the adverse party.
The whole, nevertheless, subject to the exceptions and limitations specially declared in this section, and to the provisions contained in article 1690.
1866 s. 1233; 1971, c. 86, s. 2; 1973, c. 74, s. 8; 1975, c. 83, s. 87; 1977, c. 73, s. 45; 1982, c. 32, s. 60; 1984, c. 26, s. 30