Name the four tests in regards to the difference between commercial and sovereign acts.

The tests: 1. The private individual test: can the act be performed by a private individual? - Yes --> commercial, no immunity 2. Purpose test: governmental purposes --> sovereign, immune 3. Nature test: this test looks at the nature of the act, not the purpose - Sometimes states act through commercial acts, so not trustworthy 4. Contextual test: takes purpose and nature of activity into consideration, very common