Add tests for grid

Signed-off-by: Ali Yousuf <[email protected]>

grid_test.go

@@ -0,0 +1,54 @@
+package twenty48_test
+
+import (
+	"testing"
+
+	"github.com/alyyousuf7/twenty48"
+)
+
+func TestGridTranspose(t *testing.T) {
+	// prepare data
+	grid := twenty48.Grid{
+		twenty48.Row{1, 2, 3, 4, 5},
+		twenty48.Row{6, 7, 8, 9, 10},
+		twenty48.Row{11, 12, 13, 14, 15},
+		twenty48.Row{16, 17, 18, 19, 20},
+	}
+
+	expectedGrid := twenty48.Grid{
+		twenty48.Row{1, 6, 11, 16},
+		twenty48.Row{2, 7, 12, 17},
+		twenty48.Row{3, 8, 13, 18},
+		twenty48.Row{4, 9, 14, 19},
+		twenty48.Row{5, 10, 15, 20},
+	}
+
+	// do reverse
+	newGrid := grid.Transpose()
+
+	// check if the values are as expected
+	for kr, r := range expectedGrid {
+		for kc, c := range r {
+			if c.Value() != newGrid[kr][kc].Value() {
+				t.Errorf("Transposed grid did not return expected result")
+				break
+			}
+		}
+	}
+}
+
+func TestGridString(t *testing.T) {
+	// prepare data
+	grid := twenty48.Grid{
+		twenty48.Row{1, 2, 3, 4, 5, 6},
+		twenty48.Row{7, 8, 9, 10, 11, 12},
+	}
+
+	expectedStr := "123456789101112"
+
+	str := grid.String()
+
+	if expectedStr != str {
+		t.Errorf("Expected %s, but got %s", expectedStr, str)
+	}
+}