added BigMin, BigMax utils

util.go

@@ -231,3 +231,19 @@ func FromWei(wei *big.Int, decimals uint8) string {
 func has0xPrefix(hexStr string) bool {
 	return len(hexStr) >= 2 && hexStr[0] == '0' && (hexStr[1] == 'x' || hexStr[1] == 'X')
 }
+
+// BigMin returns the smaller of the two big integers.
+func BigMin(a, b *big.Int) *big.Int {
+	if a.Cmp(b) < 0 {
+		return a
+	}
+	return b
+}
+
+// BigMax returns the larger of the two big integers.
+func BigMax(a, b *big.Int) *big.Int {
+	if a.Cmp(b) > 0 {
+		return a
+	}
+	return b
+}

util_test.go

@@ -289,3 +289,41 @@ func TestFromWei(t *testing.T) {
 		})
 	}
 }
+
+func TestBigMin(t *testing.T) {
+	tests := []struct {
+		A, B, Want *big.Int
+	}{
+		{big.NewInt(0), big.NewInt(0), big.NewInt(0)},
+		{big.NewInt(0), big.NewInt(1), big.NewInt(0)},
+		{big.NewInt(1), big.NewInt(0), big.NewInt(0)},
+	}
+
+	for i, test := range tests {
+		t.Run(strconv.Itoa(i), func(t *testing.T) {
+			got := w3.BigMin(test.A, test.B)
+			if test.Want.Cmp(got) != 0 {
+				t.Fatalf("want: %v, got: %v", test.Want, got)
+			}
+		})
+	}
+}
+
+func TestBigMax(t *testing.T) {
+	tests := []struct {
+		A, B, Want *big.Int
+	}{
+		{big.NewInt(0), big.NewInt(0), big.NewInt(0)},
+		{big.NewInt(0), big.NewInt(1), big.NewInt(1)},
+		{big.NewInt(1), big.NewInt(0), big.NewInt(1)},
+	}
+
+	for i, test := range tests {
+		t.Run(strconv.Itoa(i), func(t *testing.T) {
+			got := w3.BigMax(test.A, test.B)
+			if test.Want.Cmp(got) != 0 {
+				t.Fatalf("want: %v, got: %v", test.Want, got)
+			}
+		})
+	}
+}