diff --git a/input/gvctrl/gvctrl_test.go b/input/gvctrl/gvctrl_test.go
index 15569cf3..d0dca01e 100644
--- a/input/gvctrl/gvctrl_test.go
+++ b/input/gvctrl/gvctrl_test.go
@@ -76,3 +76,34 @@ func TestClosestValIdx(t *testing.T) {
 		}
 	}
 }
+
+func TestConvRate(t *testing.T) {
+	tests := []struct {
+		l    []int
+		v    int
+		want string
+	}{
+		{
+			l:    []int{512, 1024, 2048, 3072},
+			v:    1400,
+			want: "1024000",
+		},
+		{
+			l:    []int{512, 1024, 2048, 3072},
+			v:    1900,
+			want: "2048000",
+		},
+		{
+			l:    []int{512, 1024, 2048, 3072},
+			v:    4000,
+			want: "3072000",
+		},
+	}
+
+	for i, test := range tests {
+		got := convRate(test.v, test.l)
+		if got != test.want {
+			t.Errorf("did not get expected result for test: %d\nGot: %v\nWant: %v", i, got, test.want)
+		}
+	}
+}