diff --git a/kmath-ast/src/jvmTest/kotlin/scietifik/kmath/asm/TestAsmVariables.kt b/kmath-ast/src/jvmTest/kotlin/scietifik/kmath/asm/TestAsmVariables.kt
new file mode 100644
index 000000000..aafc75448
--- /dev/null
+++ b/kmath-ast/src/jvmTest/kotlin/scietifik/kmath/asm/TestAsmVariables.kt
@@ -0,0 +1,22 @@
+package scietifik.kmath.asm
+
+import scientifik.kmath.ast.mstInRing
+import scientifik.kmath.expressions.invoke
+import scientifik.kmath.operations.ByteRing
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertFailsWith
+
+internal class TestAsmVariables {
+    @Test
+    fun testVariableWithoutDefault() {
+        val expr = ByteRing.mstInRing { symbol("x") }
+        assertEquals(1.toByte(), expr("x" to 1.toByte()))
+    }
+
+    @Test
+    fun testVariableWithoutDefaultFails() {
+        val expr = ByteRing.mstInRing { symbol("x") }
+        assertFailsWith<IllegalStateException> { expr() }
+    }
+}