Fixing the out of bounds dataview error when attribute is of size 3 bytes

src-electron/util/types.js

@@ -116,7 +116,7 @@ function convertFloatToBigEndian(value, size) {
  * the given size. The value is returned in hex format and prefixed with '0x'.
  */
 function convertIntToBigEndian(value, size) {
-  const arrayBuffer = size <= 4 ? new ArrayBuffer(size) : new ArrayBuffer(8)
+  const arrayBuffer = new ArrayBuffer(Math.pow(2, Math.ceil(Math.log2(size))))
   const dataView = new DataView(arrayBuffer)
   let i = 0
   if (size == 1) {

test/helpers.test.js

@@ -234,6 +234,32 @@ test(
   testUtil.timeout.short()
 )
 
+test(
+  'Generated Macro little endian for attribute of size 3 bytes',
+  () => {
+    let options = { hash: { endian: 'little' } }
+    return zclHelper
+      .as_generated_default_macro('0x003840', 3, options)
+      .then((res) => {
+        return expect(res).toBe('0x40, 0x38, 0x00, ')
+      })
+  },
+  testUtil.timeout.short()
+)
+
+test(
+  'Generated Macro big endian for attribute of size 3 bytes',
+  () => {
+    let options = { hash: { endian: 'big' } }
+    return zclHelper
+      .as_generated_default_macro('0x003840', 3, options)
+      .then((res) => {
+        return expect(res).toBe(' 0x00, 0x38, 0x40,')
+      })
+  },
+  testUtil.timeout.short()
+)
+
 test(
   'Generated Macro little endian',
   () => {