input/gvctrl/gvctrl_test.go: added test for BitRate option function

input/gvctrl/gvctrl_test.go

@@ -148,3 +148,83 @@ func TestHeight(t *testing.T) {
 		}
 	}
 }
+
+func TestBitrate(t *testing.T) {
+	tests := []struct {
+		r    int
+		in   settings
+		want settings
+	}{
+		{
+			r:  7000,
+			in: settings{vbr: "1"},
+			want: settings{
+				vbr:     "1",
+				bitRate: "6000000",
+			},
+		},
+		{
+			r:  7500,
+			in: settings{vbr: "1"},
+			want: settings{
+				vbr:     "1",
+				bitRate: "8000000",
+			},
+		},
+		{
+			r: 600,
+			in: settings{
+				vbr: "0",
+				res: res256,
+			},
+			want: settings{
+				vbr:     "0",
+				res:     res256,
+				bitRate: "512000",
+			},
+		},
+		{
+			r: 100,
+			in: settings{
+				vbr: "0",
+				res: res256,
+			},
+			want: settings{
+				vbr:     "0",
+				res:     res256,
+				bitRate: "128000",
+			},
+		},
+		{
+			r: 2048,
+			in: settings{
+				vbr: "0",
+				res: res360,
+			},
+			want: settings{
+				vbr:     "0",
+				res:     res360,
+				bitRate: "2048000",
+			},
+		},
+		{
+			r: 500,
+			in: settings{
+				vbr: "0",
+				res: res720,
+			},
+			want: settings{
+				vbr:     "0",
+				res:     res720,
+				bitRate: "1024000",
+			},
+		},
+	}
+
+	for i, test := range tests {
+		got, _ := BitRate(test.r)(test.in)
+		if got != test.want {
+			t.Errorf("did not get expected result for test: %d\nGot: %v\nWant: %v", i, got, test.want)
+		}
+	}
+}