diff --git a/input_test.go b/input_test.go
index 189897c..9e1706c 100644
--- a/input_test.go
+++ b/input_test.go
@@ -28,7 +28,7 @@ func TestMouseClickXY(t *testing.T) {
 	c := testAllocate(t, "input.html")
 	defer c.Release()
 
-	err = c.Run(defaultContext, Sleep(time.Millisecond*100))
+	err = c.Run(defaultContext, Sleep(100*time.Millisecond))
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -48,7 +48,7 @@ func TestMouseClickXY(t *testing.T) {
 			t.Fatalf("test %d got error: %v", i, err)
 		}
 
-		time.Sleep(time.Millisecond * 100)
+		time.Sleep(50 * time.Millisecond)
 
 		var xstr, ystr string
 		err = c.Run(defaultContext, Value("#input1", &xstr, ByID))
@@ -113,7 +113,7 @@ func TestMouseClickNode(t *testing.T) {
 				t.Fatalf("got error: %v", err)
 			}
 
-			time.Sleep(time.Millisecond * 50)
+			time.Sleep(50 * time.Millisecond)
 
 			var value string
 			err = c.Run(defaultContext, Value("#input3", &value, ByID))
@@ -171,7 +171,7 @@ func TestMouseClickOffscreenNode(t *testing.T) {
 				}
 			}
 
-			time.Sleep(time.Millisecond * 100)
+			time.Sleep(100 * time.Millisecond)
 
 			var value int
 			err = c.Run(defaultContext, Evaluate("window.document.test_i", &value))
diff --git a/nav_test.go b/nav_test.go
index ed8479b..16230a5 100644
--- a/nav_test.go
+++ b/nav_test.go
@@ -82,7 +82,7 @@ func TestNavigationEntries(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		time.Sleep(time.Millisecond * 50)
+		time.Sleep(50 * time.Millisecond)
 
 		err = c.Run(defaultContext, NavigationEntries(&index, &entries))
 		if err != nil {
@@ -116,7 +116,7 @@ func TestNavigateToHistoryEntry(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	err = c.Run(defaultContext, NavigationEntries(&index, &entries))
 	if err != nil {
@@ -128,14 +128,14 @@ func TestNavigateToHistoryEntry(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	err = c.Run(defaultContext, NavigateToHistoryEntry(entries[index].ID))
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	var title string
 	err = c.Run(defaultContext, Title(&title))
@@ -160,7 +160,7 @@ func TestNavigateBack(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	var exptitle string
 	err = c.Run(defaultContext, Title(&exptitle))
@@ -173,14 +173,14 @@ func TestNavigateBack(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	err = c.Run(defaultContext, NavigateBack())
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	var title string
 	err = c.Run(defaultContext, Title(&title))
@@ -205,14 +205,14 @@ func TestNavigateForward(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	err = c.Run(defaultContext, Navigate(testdataDir+"/"+"image.html"))
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	var exptitle string
 	err = c.Run(defaultContext, Title(&exptitle))
@@ -225,14 +225,14 @@ func TestNavigateForward(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	err = c.Run(defaultContext, NavigateForward())
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	var title string
 	err = c.Run(defaultContext, Title(&title))
@@ -276,7 +276,7 @@ func TestReload(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	var exptitle string
 	err = c.Run(defaultContext, Title(&exptitle))
@@ -289,7 +289,7 @@ func TestReload(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	var title string
 	err = c.Run(defaultContext, Title(&title))
@@ -314,7 +314,7 @@ func TestCaptureScreenshot(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	var buf []byte
 	err = c.Run(defaultContext, CaptureScreenshot(&buf))
@@ -347,7 +347,7 @@ func TestAddOnLoadScript(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	if scriptID == "" {
 		t.Fatal("got empty script ID")
@@ -383,7 +383,7 @@ func TestRemoveOnLoadScript(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 }
 
 func TestLocation(t *testing.T) {
@@ -400,7 +400,7 @@ func TestLocation(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	var urlstr string
 	err = c.Run(defaultContext, Location(&urlstr))
@@ -427,7 +427,7 @@ func TestTitle(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	time.Sleep(time.Millisecond * 50)
+	time.Sleep(50 * time.Millisecond)
 
 	var title string
 	err = c.Run(defaultContext, Title(&title))
diff --git a/query_test.go b/query_test.go
index 8bdb2da..6a718f1 100644
--- a/query_test.go
+++ b/query_test.go
@@ -642,6 +642,8 @@ func TestDoubleClick(t *testing.T) {
 				t.Fatalf("got error: %v", err)
 			}
 
+			time.Sleep(50 * time.Millisecond)
+
 			var value string
 			err = c.Run(defaultContext, Value("#input1", &value, ByID))
 			if err != nil {
@@ -782,7 +784,7 @@ func TestComputedStyle(t *testing.T) {
 			c := testAllocate(t, "js.html")
 			defer c.Release()
 
-			time.Sleep(time.Millisecond * 50)
+			time.Sleep(50 * time.Millisecond)
 
 			var styles []*css.ComputedProperty
 			err := c.Run(defaultContext, ComputedStyle(test.sel, &styles, test.by))
@@ -803,7 +805,7 @@ func TestComputedStyle(t *testing.T) {
 				t.Fatalf("got error: %v", err)
 			}
 
-			time.Sleep(time.Millisecond * 50)
+			time.Sleep(50 * time.Millisecond)
 
 			err = c.Run(defaultContext, ComputedStyle(test.sel, &styles, test.by))
 			if err != nil {
@@ -839,7 +841,7 @@ func TestMatchedStyle(t *testing.T) {
 			c := testAllocate(t, "js.html")
 			defer c.Release()
 
-			time.Sleep(time.Millisecond * 50)
+			time.Sleep(50 * time.Millisecond)
 
 			var styles *css.GetMatchedStylesForNodeReturns
 			err := c.Run(defaultContext, MatchedStyle(test.sel, &styles, test.by))