fix: render test coverage for blockSize 15/60 + today date comparison

@@ -23,10 +23,10 @@ 			client, err := RequireClient()
 			if err != nil {
 				return err
 			}
-			isToday := date == ""
-			if isToday {
+			if date == "" {
 				date = Today()
 			}
+			isToday := date == Today()
 			d, err := client.GetDay(date, TZ())
 			if err != nil {
 				return err

@@ -1,6 +1,7 @@
 package render
 
 import (
+	"fmt"
 	"strings"
 	"testing"
 
@@ -9,22 +10,33 @@ 	"github.com/humdrum-tiv/dots-cli/internal/day"
 )
 
 func TestGridStructure(t *testing.T) {
-	d := &api.DayData{
-		BlockSize: 30,
-		Types: []day.ActivityType{
-			{ID: "t1", Name: "archer", Color: "#c04000"},
-		},
-		Blocks:     map[int]string{28: "t1"},
-		PlanBlocks: map[int]string{29: "t1"},
-	}
-	out := Grid(d, 29)
-	// 48 slots at blockSize 30 → 6 rows of 8 (4h per row), each labeled with its start hour.
-	for _, label := range []string{"0:00", "4:00", "8:00", "12:00", "16:00", "20:00"} {
-		if !strings.Contains(out, label) {
-			t.Fatalf("missing row label %s in:\n%s", label, out)
-		}
-	}
-	if !strings.Contains(out, "archer") {
-		t.Fatalf("missing legend entry:\n%s", out)
+	rowLabels := []string{"0:00", "4:00", "8:00", "12:00", "16:00", "20:00"}
+
+	for _, blockSize := range []int{15, 30, 60} {
+		t.Run(fmt.Sprintf("blockSize=%d", blockSize), func(t *testing.T) {
+			d := &api.DayData{
+				BlockSize: blockSize,
+				Types: []day.ActivityType{
+					{ID: "t1", Name: "archer", Color: "#c04000"},
+				},
+				Blocks:     map[int]string{0: "t1"},
+				PlanBlocks: map[int]string{1: "t1"},
+			}
+			out := Grid(d, 0)
+
+			for _, label := range rowLabels {
+				if !strings.Contains(out, label) {
+					t.Errorf("blockSize %d: missing row label %q in output:\n%s", blockSize, label, out)
+				}
+			}
+			if !strings.Contains(out, "archer") {
+				t.Errorf("blockSize %d: missing legend entry for %q in output:\n%s", blockSize, "archer", out)
+			}
+
+			gotRows := strings.Count(strings.TrimRight(out, "\n"), "\n") - 1 // minus blank line before legend
+			if gotRows != 6 {
+				t.Errorf("blockSize %d: expected 6 rows, got %d", blockSize, gotRows)
+			}
+		})
 	}
 }