[usage] Update formula: 1 credit = 6 minutes, rounded up

Author: jankeromnes

components/usage/pkg/stripe/stripe.go

@@ -7,6 +7,7 @@ package stripe
 import (
 	"encoding/json"
 	"fmt"
+	"math"
 	"os"
 	"strings"
 
@@ -111,6 +112,7 @@ func queriesForCustomersWithTeamIds(teamIds []string) []string {
 }
 
 // workspaceSecondsToCredits converts seconds (of workspace usage) into Stripe credits.
+// (1 credit = 6 minutes, rounded up)
 func workspaceSecondsToCredits(seconds int64) int64 {
-	return (seconds + 59) / 60
+	return int64(math.Ceil(float64(seconds) / (60 * 6)))
 }

components/usage/pkg/stripe/stripe_test.go

@@ -105,20 +105,25 @@ func TestWorkspaceSecondsToCreditsCalcuation(t *testing.T) {
 			Seconds:         60,
 			ExpectedCredits: 1,
 		},
-		{
-			Name:            "61 seconds",
-			Seconds:         61,
-			ExpectedCredits: 2,
-		},
 		{
 			Name:            "90 seconds",
 			Seconds:         90,
+			ExpectedCredits: 1,
+		},
+		{
+			Name:            "6 minutes",
+			Seconds:         360,
+			ExpectedCredits: 1,
+		},
+		{
+			Name:            "6 minutes and 1 second",
+			Seconds:         361,
 			ExpectedCredits: 2,
 		},
 		{
 			Name:            "1 hour",
 			Seconds:         3600,
-			ExpectedCredits: 60,
+			ExpectedCredits: 10,
 		},
 	}