diff --git a/bbootimg/src/main/kotlin/Helper.kt b/bbootimg/src/main/kotlin/Helper.kt
index 041a3c8..38f7db0 100644
--- a/bbootimg/src/main/kotlin/Helper.kt
+++ b/bbootimg/src/main/kotlin/Helper.kt
@@ -9,8 +9,6 @@ import org.apache.commons.exec.CommandLine
 import org.apache.commons.exec.DefaultExecutor
 import org.apache.commons.exec.ExecuteException
 import org.apache.commons.exec.PumpStreamHandler
-import org.junit.Assert
-import org.junit.Assert.assertTrue
 import org.slf4j.LoggerFactory
 import java.io.*
 import java.math.BigInteger
@@ -175,7 +173,7 @@ class Helper {
                 RandomAccessFile(outImgName, "rw").use { outRaf ->
                     inRaf.seek(offset)
                     val data = ByteArray(length)
-                    assertTrue(length == inRaf.read(data))
+                    assert(length == inRaf.read(data))
                     outRaf.write(data)
                 }
             }
@@ -210,7 +208,7 @@ class Helper {
          */
         fun encodeRSAkey(key: ByteArray): ByteArray {
             val rsa = KeyUtil.parsePemPrivateKey(ByteArrayInputStream(key))
-            Assert.assertEquals(65537.toBigInteger(), rsa.publicExponent)
+            assert(65537.toBigInteger() == rsa.publicExponent)
             val numBits: Int = BigIntegerMath.log2(rsa.modulus, RoundingMode.CEILING)
             log.debug("modulus: " + rsa.modulus)
             log.debug("numBits: $numBits")
diff --git a/bbootimg/src/main/kotlin/avb/Avb.kt b/bbootimg/src/main/kotlin/avb/Avb.kt
index 28f2c81..bcfacd5 100644
--- a/bbootimg/src/main/kotlin/avb/Avb.kt
+++ b/bbootimg/src/main/kotlin/avb/Avb.kt
@@ -11,7 +11,6 @@ import cfig.Helper.Companion.paddingWith
 import cfig.io.Struct3
 import com.fasterxml.jackson.databind.ObjectMapper
 import org.apache.commons.codec.binary.Hex
-import org.junit.Assert
 import org.slf4j.LoggerFactory
 import java.io.File
 import java.io.FileInputStream
@@ -93,7 +92,7 @@ class Avb {
             log.info("4/4 Appending AVB footer (${footerBlobWithPadding.size} bytes)...")
             fos.write(footerBlobWithPadding)
         }
-        Assert.assertEquals("generated file size mismatch", partition_size, File(image_file).length())
+        assert(partition_size == File(image_file).length()) { "generated file size mismatch" }
         log.info("addHashFooter($image_file) done.")
     }
 
diff --git a/bbootimg/src/main/kotlin/avb/blob/AuxBlob.kt b/bbootimg/src/main/kotlin/avb/blob/AuxBlob.kt
index 9d69e32..06f30f2 100644
--- a/bbootimg/src/main/kotlin/avb/blob/AuxBlob.kt
+++ b/bbootimg/src/main/kotlin/avb/blob/AuxBlob.kt
@@ -6,7 +6,6 @@ import cfig.Helper
 import cfig.io.Struct3
 import com.fasterxml.jackson.annotation.JsonIgnore
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties
-import org.junit.Assert
 import org.slf4j.LoggerFactory
 import java.nio.file.Files
 import java.nio.file.Paths
@@ -98,7 +97,7 @@ class AuxBlob(
                 }
                 encodedKey = Helper.encodeRSAkey(algKey!!)
                 log.info("encodePubKey(): size = ${alg.public_key_num_bytes}, algorithm key size: ${encodedKey.size}")
-                Assert.assertEquals(alg.public_key_num_bytes, encodedKey.size)
+                assert(alg.public_key_num_bytes == encodedKey.size)
             } else {
                 log.info("encodePubKey(): No key to encode for algorithm " + alg.name)
             }
diff --git a/bbootimg/src/main/kotlin/avb/blob/Footer.kt b/bbootimg/src/main/kotlin/avb/blob/Footer.kt
index e5f8b87..38b7383 100644
--- a/bbootimg/src/main/kotlin/avb/blob/Footer.kt
+++ b/bbootimg/src/main/kotlin/avb/blob/Footer.kt
@@ -1,7 +1,6 @@
 package avb.blob
 
 import cfig.io.Struct3
-import org.junit.Assert
 import java.io.File
 import java.io.FileInputStream
 import java.io.InputStream
@@ -35,7 +34,7 @@ data class Footer constructor(
     @Throws(IllegalArgumentException::class)
     constructor(iS: InputStream) : this() {
         val info = Struct3(FORMAT_STRING).unpack(iS)
-        Assert.assertEquals(7, info.size)
+        assert(7 == info.size)
         if (MAGIC != (info[0] as String)) {
             throw IllegalArgumentException("stream doesn't look like valid AVB Footer")
         }
@@ -81,7 +80,7 @@ data class Footer constructor(
         private const val FORMAT_STRING = "!4s2L3Q${RESERVED}x"
 
         init {
-            Assert.assertEquals(SIZE, Struct3(FORMAT_STRING).calcSize())
+            assert(SIZE == Struct3(FORMAT_STRING).calcSize())
         }
     }
 }
\ No newline at end of file
diff --git a/bbootimg/src/main/kotlin/avb/blob/Header.kt b/bbootimg/src/main/kotlin/avb/blob/Header.kt
index f691975..73e4482 100644
--- a/bbootimg/src/main/kotlin/avb/blob/Header.kt
+++ b/bbootimg/src/main/kotlin/avb/blob/Header.kt
@@ -2,7 +2,6 @@ package avb.blob
 
 import cfig.Avb
 import cfig.io.Struct3
-import org.junit.Assert
 import java.io.InputStream
 
 //avbtool::AvbVBMetaHeader
@@ -29,7 +28,7 @@ data class Header(
     @Throws(IllegalArgumentException::class)
     constructor(iS: InputStream) : this() {
         val info = Struct3(FORMAT_STRING).unpack(iS)
-        Assert.assertEquals(22, info.size)
+        assert(22 == info.size)
         if (info[0] != magic) {
             throw IllegalArgumentException("stream doesn't look like valid VBMeta Header")
         }
@@ -109,7 +108,7 @@ data class Header(
         private const val FORMAT_STRING = ("!4s2L2QL11QL${REVERSED0}x47sx" + "${REVERSED}x")
 
         init {
-            Assert.assertEquals(SIZE, Struct3(FORMAT_STRING).calcSize())
+            assert(SIZE == Struct3(FORMAT_STRING).calcSize())
         }
     }
 }
\ No newline at end of file
diff --git a/bbootimg/src/main/kotlin/avb/desc/HashDescriptor.kt b/bbootimg/src/main/kotlin/avb/desc/HashDescriptor.kt
index 770a26a..abcd3cd 100644
--- a/bbootimg/src/main/kotlin/avb/desc/HashDescriptor.kt
+++ b/bbootimg/src/main/kotlin/avb/desc/HashDescriptor.kt
@@ -4,7 +4,6 @@ import avb.blob.Header
 import cfig.Helper
 import cfig.io.Struct3
 import org.apache.commons.codec.binary.Hex
-import org.junit.Assert
 import org.slf4j.LoggerFactory
 import java.io.File
 import java.io.FileInputStream
@@ -50,7 +49,7 @@ class HashDescriptor(var flags: UInt = 0U,
             throw IllegalArgumentException("Given data does not look like a |hash| descriptor")
         }
         val payload = Struct3("${this.partition_name_len}s${this.salt_len}b${this.digest_len}b").unpack(data)
-        Assert.assertEquals(3, payload.size)
+        assert(3 == payload.size)
         this.partition_name = payload[0] as String
         this.salt = payload[1] as ByteArray
         this.digest = payload[2] as ByteArray
diff --git a/bbootimg/src/main/kotlin/avb/desc/KernelCmdlineDescriptor.kt b/bbootimg/src/main/kotlin/avb/desc/KernelCmdlineDescriptor.kt
index 9b80a60..a3e935d 100644
--- a/bbootimg/src/main/kotlin/avb/desc/KernelCmdlineDescriptor.kt
+++ b/bbootimg/src/main/kotlin/avb/desc/KernelCmdlineDescriptor.kt
@@ -2,7 +2,6 @@ package avb.desc
 
 import cfig.Helper
 import cfig.io.Struct3
-import org.junit.Assert
 import java.io.InputStream
 
 @ExperimentalUnsignedTypes
@@ -60,7 +59,7 @@ class KernelCmdlineDescriptor(
         const val flagHashTreeDisabled = 2U
 
         init {
-            Assert.assertEquals(SIZE, Struct3(FORMAT_STRING).calcSize())
+            assert(SIZE == Struct3(FORMAT_STRING).calcSize())
         }
     }
 }
diff --git a/bbootimg/src/main/kotlin/avb/desc/UnknownDescriptor.kt b/bbootimg/src/main/kotlin/avb/desc/UnknownDescriptor.kt
index 1e91526..53c9c0a 100644
--- a/bbootimg/src/main/kotlin/avb/desc/UnknownDescriptor.kt
+++ b/bbootimg/src/main/kotlin/avb/desc/UnknownDescriptor.kt
@@ -3,7 +3,6 @@ package avb.desc
 import cfig.Helper
 import cfig.io.Struct3
 import org.apache.commons.codec.binary.Hex
-import org.junit.Assert
 import org.slf4j.LoggerFactory
 import java.io.ByteArrayInputStream
 import java.io.InputStream
@@ -108,7 +107,7 @@ class UnknownDescriptor(var data: ByteArray = byteArrayOf()) : Descriptor(0U, 0U
         }
 
         init {
-            Assert.assertEquals(SIZE, Struct3(FORMAT).calcSize())
+            assert(SIZE == Struct3(FORMAT).calcSize())
         }
     }
 }
diff --git a/bbootimg/src/main/kotlin/bootimg/BootImgHeader.kt b/bbootimg/src/main/kotlin/bootimg/BootImgHeader.kt
index d5edeee..2321ec2 100644
--- a/bbootimg/src/main/kotlin/bootimg/BootImgHeader.kt
+++ b/bbootimg/src/main/kotlin/bootimg/BootImgHeader.kt
@@ -3,7 +3,6 @@ package cfig.bootimg
 import cfig.Helper
 import cfig.ParamConfig
 import cfig.io.Struct3
-import org.junit.Assert
 import org.slf4j.LoggerFactory
 import java.io.File
 import java.io.FileInputStream
@@ -53,7 +52,7 @@ open class BootImgHeader(
         }
         log.warn("BootImgHeader constructor")
         val info = Struct3(FORMAT_STRING).unpack(iS)
-        Assert.assertEquals(20, info.size)
+        assert(20 == info.size)
         if (info[0] != magic) {
             throw IllegalArgumentException("stream doesn't look like Android Boot Image Header")
         }
@@ -118,9 +117,9 @@ open class BootImgHeader(
             if (m.groupCount() == 3) {
                 c = Integer.decode(m.group(3))
             }
-            Assert.assertTrue(a < 128)
-            Assert.assertTrue(b < 128)
-            Assert.assertTrue(c < 128)
+            assert(a < 128)
+            assert(b < 128)
+            assert(c < 128)
             return (a shl 14) or (b shl 7) or c
         } else {
             throw IllegalArgumentException("invalid os_version")
@@ -136,8 +135,8 @@ open class BootImgHeader(
             val y = Integer.parseInt(matcher.group(1), 10) - 2000
             val m = Integer.parseInt(matcher.group(2), 10)
             // 7 bits allocated for the year, 4 bits for the month
-            Assert.assertTrue(y in 0..127)
-            Assert.assertTrue(m in 1..12)
+            assert(y in 0..127)
+            assert(m in 1..12)
             ret = (y shl 4) or m
         } else {
             throw IllegalArgumentException("invalid os_patch_level")
@@ -181,9 +180,9 @@ open class BootImgHeader(
 
     private fun get_recovery_dtbo_offset(): UInt {
         return Helper.round_to_multiple(this.headerSize, pageSize) +
-            Helper.round_to_multiple(this.kernelLength, pageSize) +
-            Helper.round_to_multiple(this.ramdiskLength, pageSize) +
-            Helper.round_to_multiple(this.secondBootloaderLength, pageSize)
+                Helper.round_to_multiple(this.kernelLength, pageSize) +
+                Helper.round_to_multiple(this.ramdiskLength, pageSize) +
+                Helper.round_to_multiple(this.secondBootloaderLength, pageSize)
     }
 
     private fun refresh() {
@@ -245,8 +244,7 @@ open class BootImgHeader(
         val pageSizeChoices: MutableSet<Long> = mutableSetOf<Long>().apply {
             (11..14).forEach { add(2.0.pow(it).toLong()) }
         }
-        Assert.assertTrue("invalid parameter [pageSize=$pageSize], (choose from $pageSizeChoices)",
-                pageSizeChoices.contains(pageSize.toLong()))
+        assert(pageSizeChoices.contains(pageSize.toLong())) { "invalid parameter [pageSize=$pageSize], (choose from $pageSizeChoices)" }
         return Struct3(FORMAT_STRING).pack(
                 "ANDROID!",
                 //10I
@@ -304,7 +302,7 @@ open class BootImgHeader(
         const val BOOT_IMAGE_HEADER_V1_SIZE = 1648
 
         init {
-            Assert.assertEquals(BOOT_IMAGE_HEADER_V2_SIZE, Struct3(FORMAT_STRING).calcSize())
+            assert(BOOT_IMAGE_HEADER_V2_SIZE == Struct3(FORMAT_STRING).calcSize())
         }
     }
 }
diff --git a/bbootimg/src/main/kotlin/bootimg/Packer.kt b/bbootimg/src/main/kotlin/bootimg/Packer.kt
index 2967dc6..22dd563 100644
--- a/bbootimg/src/main/kotlin/bootimg/Packer.kt
+++ b/bbootimg/src/main/kotlin/bootimg/Packer.kt
@@ -5,7 +5,6 @@ import com.fasterxml.jackson.databind.ObjectMapper
 import org.apache.commons.exec.CommandLine
 import org.apache.commons.exec.DefaultExecutor
 import org.apache.commons.exec.PumpStreamHandler
-import org.junit.Assert.assertTrue
 import org.slf4j.LoggerFactory
 import java.io.*
 import java.nio.ByteBuffer
@@ -50,7 +49,7 @@ class Packer {
     }
 
     private fun writePaddedFile(inBF: ByteBuffer, srcFile: String, padding: UInt) {
-        assertTrue(padding < Int.MAX_VALUE.toUInt())
+        assert(padding < Int.MAX_VALUE.toUInt())
         writePaddedFile(inBF, srcFile, padding.toInt())
     }
 
diff --git a/bbootimg/src/main/kotlin/bootloader_message/BootloaderMsg.kt b/bbootimg/src/main/kotlin/bootloader_message/BootloaderMsg.kt
index 5fb4782..96e7e6b 100644
--- a/bbootimg/src/main/kotlin/bootloader_message/BootloaderMsg.kt
+++ b/bbootimg/src/main/kotlin/bootloader_message/BootloaderMsg.kt
@@ -1,7 +1,6 @@
 package cfig.bootloader_message
 
 import cfig.io.Struct3
-import org.junit.Assert
 import org.slf4j.LoggerFactory
 import java.io.File
 import java.io.FileInputStream
@@ -23,7 +22,7 @@ data class BootloaderMsg(
         private val log = LoggerFactory.getLogger("BootloaderMsg")
 
         init {
-            Assert.assertEquals(SIZE, Struct3(FORMAT_STRING).calcSize())
+            assert(SIZE == Struct3(FORMAT_STRING).calcSize())
         }
     }