diff --git a/lib/script/common.js b/lib/script/common.js
index 0fb0186c..33e30562 100644
--- a/lib/script/common.js
+++ b/lib/script/common.js
@@ -557,9 +557,17 @@ exports.formatCode = function formatCode(code) {
   const out = [];
 
   for (const op of code) {
+    // Bad push
+    if (op.value === -1) {
+      out.push('OP_INVALIDOPCODE');
+      break;
+    }
+
     if (op.data) {
+      const symbol = exports.opcodesByVal[op.value];
+
       // Direct push
-      if (!exports.opcodesByVal[op.value]) {
+      if (!symbol) {
         let size = op.value.toString(16);
         if (size.length < 2)
           size = '0' + size;
@@ -568,8 +576,6 @@ exports.formatCode = function formatCode(code) {
       }
 
       // Pushdatas
-      const symbol = exports.opcodesByVal[op.value];
-
       let size = op.data.length.toString(16);
 
       while (size.length % 2 !== 0)
@@ -581,20 +587,14 @@ exports.formatCode = function formatCode(code) {
     }
 
     // Opcodes
-    if (exports.opcodesByVal[op.value]) {
-      const symbol = exports.opcodesByVal[op.value];
+    let symbol = exports.opcodesByVal[op.value];
+    if (symbol) {
       out.push(symbol);
       continue;
     }
 
-    // Bad push
-    if (op.value === -1) {
-      out.push('OP_INVALIDOPCODE');
-      break;
-    }
-
     // Unknown opcodes
-    let symbol = op.value.toString(16);
+    symbol = op.value.toString(16);
 
     if (symbol.length < 2)
       symbol = '0' + symbol;
diff --git a/lib/script/script.js b/lib/script/script.js
index e00d09ba..9eff54bf 100644
--- a/lib/script/script.js
+++ b/lib/script/script.js
@@ -2692,7 +2692,7 @@ Script.prototype.fromString = function fromString(code) {
 
     if (value == null) {
       if (item[0] === '\'') {
-        assert(item[item.length - 1] === '\'', 'Unknown opcode.');
+        assert(item[item.length - 1] === '\'', 'Invalid string.');
         const str = item.slice(1, -1);
         const op = Opcode.fromString(str);
         bw.writeBytes(op.toRaw());
@@ -2708,10 +2708,10 @@ Script.prototype.fromString = function fromString(code) {
 
       assert(item.indexOf('0x') === 0, 'Unknown opcode.');
 
-      const str = item.substring(2);
-      const data = Buffer.from(str, 'hex');
+      const hex = item.substring(2);
+      const data = Buffer.from(hex, 'hex');
 
-      assert(data.length === str.length / 2, 'Unknown opcode.');
+      assert(data.length === hex.length / 2, 'Invalid hex string.');
 
       bw.writeBytes(data);
 
diff --git a/test/script-test.js b/test/script-test.js
index 16484579..636664f8 100644
--- a/test/script-test.js
+++ b/test/script-test.js
@@ -26,11 +26,11 @@ function isSuccess(stack) {
 
 function parseScriptTest(data) {
   const witArr = Array.isArray(data[0]) ? data.shift() : [];
-  const inpHex = data[0] ? data[0].trim() : data[0] || '';
-  const outHex = data[1] ? data[1].trim() : data[1] || '';
-  const names = data[2] ? data[2].trim().split(/,\s*/) : [];
-  const expected = data[3] || '';
-  let comments = Array.isArray(data[4]) ? data[4].join('. ') : data[4] || '';
+  const inpHex = data[0];
+  const outHex = data[1];
+  const names = data[2] || 'NONE';
+  const expected = data[3];
+  let comments = data[4];
 
   if (!comments)
     comments = outHex.slice(0, 60);
@@ -46,10 +46,13 @@ function parseScriptTest(data) {
   const output = Script.fromString(outHex);
 
   let flags = 0;
-  for (const name of names) {
-    const flag = `VERIFY_${name}`;
-    assert(Script.flags[flag] != null, 'Unknown flag.');
-    flags |= Script.flags[flag];
+  for (const name of names.split(',')) {
+    const flag = Script.flags[`VERIFY_${name}`];
+
+    if (flag == null)
+      throw new Error(`Unknown flag: ${name}.`);
+
+    flags |= flag;
   }
 
   return {
diff --git a/test/tx-test.js b/test/tx-test.js
index 40ebe0e9..7cf89a3b 100644
--- a/test/tx-test.js
+++ b/test/tx-test.js
@@ -9,7 +9,6 @@ const encoding = require('../lib/utils/encoding');
 const random = require('../lib/crypto/random');
 const consensus = require('../lib/protocol/consensus');
 const TX = require('../lib/primitives/tx');
-const Coin = require('../lib/primitives/coin');
 const Output = require('../lib/primitives/output');
 const Outpoint = require('../lib/primitives/outpoint');
 const Script = require('../lib/script/script');
@@ -36,24 +35,30 @@ const MAX_SAFE_INTEGER = Number.MAX_SAFE_INTEGER;
 const MAX_SAFE_ADDITION = 0xfffffffffffff;
 
 function clearCache(tx, noCache) {
-  if (!noCache) {
-    const copy = tx.clone();
-    assert.strictEqual(tx.txid(), copy.txid());
-    assert.strictEqual(tx.wtxid(), copy.wtxid());
+  if (noCache) {
+    tx.refresh();
     return;
   }
-  tx.refresh();
+
+  const copy = tx.clone();
+  assert.strictEqual(tx.txid(), copy.txid());
+  assert.strictEqual(tx.wtxid(), copy.wtxid());
 }
 
 function parseTXTest(data) {
-  const [coins, hex, names] = data;
+  const coins = data[0];
+  const hex = data[1];
+  const names = data[2] || 'NONE';
 
   let flags = 0;
 
-  for (const name of (names || '').trim().split(/,\s*/)) {
-    const flag = `VERIFY_${name}`;
-    assert(Script.flags[flag] != null, 'Unknown flag.');
-    flags |= Script.flags[flag];
+  for (const name of names.split(',')) {
+    const flag = Script.flags[`VERIFY_${name}`];
+
+    if (flag == null)
+      throw new Error(`Unknown flag: ${name}.`);
+
+    flags |= flag;
   }
 
   const view = new CoinView();