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670824c6fa
For convenience making Raft tests, use declarative structures.
Servers are set up and initialized and then updates are processed.
For now, updates are just adding entries to leader and change of leader.
Updates and leader changes can be specified to run after initial test setup.
An example test for 3 nodes, node 0 starting as leader having two entries
0 and 1 for term 1, and with current term 2, then adding 12 entries,
changing leader to node 1, and adding 12 more entries. The test will
automatically add more entries to the last leader until the test limit
of total_values (default 100).
{.name = "test_name", .nodes = 3, .initial_term = 2,
.initial_states = {{.le = {{1,0},{1,1}}},
.updates = {entries{12},new_leader{1},entries{12}},},
Leader is isolated before change via is_leader returning false.
Initial leader (default server 0) will be set with this method, too.
Signed-off-by: Alejo Sanchez <alejo.sanchez@scylladb.com>