From ffc6b88a366bda126e10ec7b9f195e451fadbd2c Mon Sep 17 00:00:00 2001
From: Armon Dadgar <armon.dadgar@gmail.com>
Date: Thu, 13 Aug 2015 22:11:32 -0700
Subject: [PATCH] scheduler: test node drain behavior

---
 scheduler/service_sched_test.go | 73 ++++++++++++++++++++++++++++++++-
 1 file changed, 71 insertions(+), 2 deletions(-)

diff --git a/scheduler/service_sched_test.go b/scheduler/service_sched_test.go
index 5d6061934..040532f9f 100644
--- a/scheduler/service_sched_test.go
+++ b/scheduler/service_sched_test.go
@@ -40,7 +40,7 @@ func TestServiceSched_JobRegister(t *testing.T) {
 	}
 	plan := h.Plans[0]
 
-	// Ensure the plan evicted all nodes
+	// Ensure the plan allocated
 	var planned []*structs.Allocation
 	for _, allocList := range plan.NodeAllocation {
 		planned = append(planned, allocList...)
@@ -114,5 +114,74 @@ func TestServiceSched_JobDeregister(t *testing.T) {
 }
 
 func TestServiceSched_NodeDrain(t *testing.T) {
-	// TODO
+	h := NewHarness(t)
+
+	// Register a draining node
+	node := mock.Node()
+	node.Status = structs.NodeStatusDrain
+	noErr(t, h.State.RegisterNode(h.NextIndex(), node))
+
+	// Create some nodes
+	for i := 0; i < 10; i++ {
+		node := mock.Node()
+		noErr(t, h.State.RegisterNode(h.NextIndex(), node))
+	}
+
+	// Generate a fake job with allocations
+	job := mock.Job()
+	noErr(t, h.State.RegisterJob(h.NextIndex(), job))
+
+	var allocs []*structs.Allocation
+	for i := 0; i < 10; i++ {
+		alloc := mock.Alloc()
+		alloc.Job = job
+		alloc.JobID = job.ID
+		alloc.NodeID = node.ID
+		allocs = append(allocs, alloc)
+	}
+	noErr(t, h.State.UpdateAllocations(h.NextIndex(), nil, allocs))
+
+	// Create a mock evaluation to deal with drain
+	eval := &structs.Evaluation{
+		ID:          mock.GenerateUUID(),
+		Priority:    50,
+		TriggeredBy: structs.EvalTriggerNodeUpdate,
+		JobID:       job.ID,
+		NodeID:      node.ID,
+	}
+
+	// Process the evaluation
+	err := h.Process(NewServiceScheduler, eval)
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	// Ensure a single plan
+	if len(h.Plans) != 1 {
+		t.Fatalf("bad: %#v", h.Plans)
+	}
+	plan := h.Plans[0]
+
+	// Ensure the plan evicted all allocs
+	if len(plan.NodeEvict[node.ID]) != len(allocs) {
+		t.Fatalf("bad: %#v", plan)
+	}
+
+	// Ensure the plan allocated
+	var planned []*structs.Allocation
+	for _, allocList := range plan.NodeAllocation {
+		planned = append(planned, allocList...)
+	}
+	if len(planned) != 10 {
+		t.Fatalf("bad: %#v", plan)
+	}
+
+	// Lookup the allocations by JobID
+	out, err := h.State.AllocsByJob(job.ID)
+	noErr(t, err)
+
+	// Ensure all allocations placed
+	if len(out) != 10 {
+		t.Fatalf("bad: %#v", out)
+	}
 }