Add test for code coverage

Author: bjee19

internal/mode/static/health_test.go

@@ -23,3 +23,18 @@ func TestReadyCheck(t *testing.T) {
 	healthChecker.ready = true
 	g.Expect(healthChecker.readyCheck(nil)).To(Succeed())
 }
+
+func TestSetAsLeader(t *testing.T) {
+	t.Parallel()
+	g := NewWithT(t)
+	healthChecker := newGraphBuiltHealthChecker()
+	healthChecker.eventCh = make(chan interface{}, 1)
+
+	g.Expect(healthChecker.leader).To(BeFalse())
+	g.Expect(healthChecker.eventCh).ShouldNot(Receive())
+
+	healthChecker.setAsLeader()
+
+	g.Expect(healthChecker.leader).To(BeTrue())
+	g.Expect(healthChecker.eventCh).Should(Receive())
+}