// TODO(cmars) 2015/08/10: rework this into builtin Engine cycle checker.
func (s *ManifoldsSuite) TestAcyclic(c *gc.C) {
manifolds := unit.Manifolds(unit.ManifoldsConfig{
Agent: fakeAgent{},
})
err := dependency.Validate(manifolds)
c.Assert(err, jc.ErrorIsNil)
}
func (s *EngineSuite) TestValidateComplexManifolds(c *gc.C) {
// Create a bunch of manifolds with tangled but acyclic dependencies; check
// that they pass validation.
manifolds := dependency.Manifolds{
"root1": dependency.Manifold{},
"root2": dependency.Manifold{},
"mid1": dependency.Manifold{Inputs: []string{"root1"}},
"mid2": dependency.Manifold{Inputs: []string{"root1", "root2"}},
"leaf1": dependency.Manifold{Inputs: []string{"root2", "mid1"}},
"leaf2": dependency.Manifold{Inputs: []string{"root1", "mid2"}},
"leaf3": dependency.Manifold{Inputs: []string{"root1", "root2", "mid1", "mid2"}},
}
err := dependency.Validate(manifolds)
c.Check(err, jc.ErrorIsNil)
// Introduce a cycle; check the manifolds no longer validate.
manifolds["root1"] = dependency.Manifold{Inputs: []string{"leaf1"}}
err = dependency.Validate(manifolds)
c.Check(err, gc.ErrorMatches, "cycle detected at .*")
}
func (s *EngineSuite) TestValidateTrivialCycle(c *gc.C) {
err := dependency.Validate(dependency.Manifolds{
"a": dependency.Manifold{Inputs: []string{"a"}},
})
c.Check(err.Error(), gc.Equals, `cycle detected at "a" (considering: map[a:true])`)
}
func (s *EngineSuite) TestValidateEmptyManifolds(c *gc.C) {
err := dependency.Validate(dependency.Manifolds{})
c.Check(err, jc.ErrorIsNil)
}