shapes: transform to a table test

shapes/shapes_test.go

@@ -13,24 +13,18 @@ func TestPerimeter(t *testing.T) {
 }
 
 func TestArea(t *testing.T) {
-	checkArea := func(t testing.TB, shape Shape, exp float64) {
+	areaTests := []struct {
-		t.Helper()
+		shape Shape
-		got := shape.Area()
+		exp   float64
-
+	}{
-		if got != exp {
+		{Rectangle{30.5, 20.5}, 625.25},
-			t.Errorf("got %.2f expected %.2f", got, exp)
+		{Circle{10}, 314.1592653589793},
-		}
 	}
 
-	t.Run("rectangles", func(t *testing.T) {
+	for _, test := range areaTests {
-		rectangle := Rectangle{30.5, 20.5}
+		got := test.shape.Area()
-		exp := 625.25
+		if got != test.exp {
-		checkArea(t, rectangle, exp)
+			t.Errorf("got %.2f expected %.2f", got, test.exp)
-	})
+		}
-
+	}
-	t.Run("circles", func(t *testing.T) {
-		circle := Circle{10}
-		exp := 314.1592653589793
-		checkArea(t, circle, exp)
-	})
 }