Create Nip19Test testing toInt32()

app/src/test/java/com/vitorpamplona/amethyst/service/Nip19Test.kt

@@ -0,0 +1,23 @@
+package com.vitorpamplona.amethyst.service
+
+import org.junit.Assert
+import org.junit.Test
+
+class Nip19Test {
+
+  @Test(expected = IllegalArgumentException::class)
+  fun to_int_32_length_smaller_than_4() {
+    toInt32(ByteArray(3))
+  }
+
+  @Test(expected = IllegalArgumentException::class)
+  fun to_int_32_length_bigger_than_4() {
+    toInt32(ByteArray(5))
+  }
+
+  @Test()
+  fun to_int_32_length_4() {
+    val actual = toInt32(ByteArray(4))
+    Assert.assertEquals(0, actual)
+  }
+}