Fix flaky unit test

WeiZhang555 · WeiZhang555 · commit bc5768733db7 · 2016-09-17T19:40:58.000+08:00
Fix flaky test `TestHTTPTimeout` caused by precision problem.

Signed-off-by: Zhang Wei &lt;zhangwei555@huawei.com&gt;
diff --git a/pkg/plugins/client_test.go b/pkg/plugins/client_test.go
@@ -47,14 +47,14 @@ func testHTTPTimeout(t *testing.T, timeout, epsilon time.Duration) {
 		t.Fatalf("The request should be canceled %v", err)
 	}
 	elapsed := time.Now().Sub(begin)
-	if elapsed < timeout || elapsed > timeout+epsilon {
+	if elapsed < timeout-epsilon || elapsed > timeout+epsilon {
 		t.Fatalf("elapsed time: got %v, expected %v (epsilon=%v)",
 			elapsed, timeout, epsilon)
 	}
 }
 
 func TestHTTPTimeout(t *testing.T) {
-	testHTTPTimeout(t, 5*time.Second, 1*time.Second)
+	testHTTPTimeout(t, 5*time.Second, 500*time.Millisecond)
 }
 
 func TestFailedConnection(t *testing.T) {

Original file line number	Diff line number	Diff line change
`@@ -47,14 +47,14 @@ func testHTTPTimeout(t *testing.T, timeout, epsilon time.Duration) {`
`47`	`47`	`t.Fatalf("The request should be canceled %v", err)`
`48`	`48`	`}`
`49`	`49`	`elapsed := time.Now().Sub(begin)`
`50`		`- if elapsed < timeout \|\| elapsed > timeout+epsilon {`
	`50`	`+ if elapsed < timeout-epsilon \|\| elapsed > timeout+epsilon {`
`51`	`51`	`t.Fatalf("elapsed time: got %v, expected %v (epsilon=%v)",`
`52`	`52`	`elapsed, timeout, epsilon)`
`53`	`53`	`}`
`54`	`54`	`}`
`55`	`55`
`56`	`56`	`func TestHTTPTimeout(t *testing.T) {`
`57`		`- testHTTPTimeout(t, 5time.Second, 1time.Second)`
	`57`	`+ testHTTPTimeout(t, 5time.Second, 500time.Millisecond)`
`58`	`58`	`}`
`59`	`59`
`60`	`60`	`func TestFailedConnection(t *testing.T) {`