Moved unit test files inside same directory as test target

The unit tests were inside the `gateway/tests` directory which had no
effect to the coverage for `go test`. Therefore, moved the tests inside
the same directory as the test target.

Signed-off-by: Ken Fukuyama <kenfdev@gmail.com>

gateway/handlers/alerthandler_test.go

@@ -0,0 +1,53 @@
+// Copyright (c) Alex Ellis 2017. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+package handlers
+
+import (
+	"testing"
+)
+
+func TestScale1to5(t *testing.T) {
+	minReplicas := uint64(1)
+	newReplicas := CalculateReplicas("firing", 1, DefaultMaxReplicas, minReplicas)
+	if newReplicas != 5 {
+		t.Log("Expected increment in blocks of 5 from 1 to 5")
+		t.Fail()
+	}
+}
+
+func TestScale5to10(t *testing.T) {
+	minReplicas := uint64(1)
+	newReplicas := CalculateReplicas("firing", 5, DefaultMaxReplicas, minReplicas)
+	if newReplicas != 10 {
+		t.Log("Expected increment in blocks of 5 from 5 to 10")
+		t.Fail()
+	}
+}
+
+func TestScaleCeilingOf20Replicas_Noaction(t *testing.T) {
+	minReplicas := uint64(1)
+	newReplicas := CalculateReplicas("firing", 20, DefaultMaxReplicas, minReplicas)
+	if newReplicas != 20 {
+		t.Log("Expected ceiling of 20 replicas")
+		t.Fail()
+	}
+}
+
+func TestScaleCeilingOf20Replicas(t *testing.T) {
+	minReplicas := uint64(1)
+	newReplicas := CalculateReplicas("firing", 19, DefaultMaxReplicas, minReplicas)
+	if newReplicas != 20 {
+		t.Log("Expected ceiling of 20 replicas")
+		t.Fail()
+	}
+}
+
+func TestBackingOff10to1(t *testing.T) {
+	minReplicas := uint64(1)
+	newReplicas := CalculateReplicas("resolved", 10, DefaultMaxReplicas, minReplicas)
+	if newReplicas != 1 {
+		t.Log("Expected backing off to 1 replica")
+		t.Fail()
+	}
+}