adding more tests

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>

go/vt/schemadiff/schema_diff_test.go

@@ -1116,6 +1116,40 @@ func TestSchemaDiff(t *testing.T) {
  conflictingDiffs: 2,
  instantCapability: InstantDDLCapabilityImpossible,
  },
+ {
+ name: "add and drop FK, add and drop column, impossible order even with create table first strategy",
+ fromQueries: []string{
+ "create table t1 (id int primary key, p int, key p_idx (p));",
+ "create table t2 (id int primary key, p int, key p_idx (p), foreign key (p) references t1 (p) on delete no action);",
+ },
+ toQueries: []string{
+ "create table t1 (id int primary key, q int, key q_idx (q));",
+ "create table t2 (id int primary key, q int, key q_idx (q), foreign key (q) references t1 (q) on delete no action);",
+ },
+ expectDiffs: 2,
+ expectDeps: 1,
+ sequential: true,
+ conflictingDiffs: 2,
+ instantCapability: InstantDDLCapabilityImpossible,
+ fkStrategy: ForeignKeyCheckStrategyCreateTableFirst,
+ },
+ {
+ name: "add and drop FK, add and drop column, impossible order even with ignore strategy",
+ fromQueries: []string{
+ "create table t1 (id int primary key, p int, key p_idx (p));",
+ "create table t2 (id int primary key, p int, key p_idx (p), foreign key (p) references t1 (p) on delete no action);",
+ },
+ toQueries: []string{
+ "create table t1 (id int primary key, q int, key q_idx (q));",
+ "create table t2 (id int primary key, q int, key q_idx (q), foreign key (q) references t1 (q) on delete no action);",
+ },
+ expectDiffs: 2,
+ expectDeps: 1,
+ sequential: true,
+ conflictingDiffs: 2,
+ instantCapability: InstantDDLCapabilityImpossible,
+ fkStrategy: ForeignKeyCheckStrategyIgnore,
+ },
  {
  name: "add and drop FK, add and drop respective tables, fk strict",
  fromQueries: []string{