diff --git a/kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeAlgebras.kt b/kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeConsistencyWithInterpreter.kt
similarity index 68%
rename from kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeAlgebras.kt
rename to kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeConsistencyWithInterpreter.kt
index 09a8ab3e5..242a4154d 100644
--- a/kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeAlgebras.kt
+++ b/kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeConsistencyWithInterpreter.kt
@@ -1,18 +1,18 @@
 package kscience.kmath.estree
 
-import kscience.kmath.ast.mstInField
-import kscience.kmath.ast.mstInRing
-import kscience.kmath.ast.mstInSpace
+import kscience.kmath.ast.*
 import kscience.kmath.expressions.invoke
 import kscience.kmath.operations.ByteRing
+import kscience.kmath.operations.ComplexField
 import kscience.kmath.operations.RealField
+import kscience.kmath.operations.toComplex
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
-internal class TestESTreeAlgebras {
+internal class TestESTreeConsistencyWithInterpreter {
     @Test
-    fun space() {
-        val res1 = ByteRing.mstInSpace {
+    fun mstSpace() {
+        val res1 = MstSpace.mstInSpace {
             binaryOperation("+")(
                 unaryOperation("+")(
                     number(3.toByte()) - (number(2.toByte()) + (multiply(
@@ -23,9 +23,9 @@ internal class TestESTreeAlgebras {
 
                 number(1)
             ) + symbol("x") + zero
-        }("x" to 2.toByte())
+        }("x" to MST.Numeric(2))
 
-        val res2 = ByteRing.mstInSpace {
+        val res2 = MstSpace.mstInSpace {
             binaryOperation("+")(
                 unaryOperation("+")(
                     number(3.toByte()) - (number(2.toByte()) + (multiply(
@@ -36,13 +36,13 @@ internal class TestESTreeAlgebras {
 
                 number(1)
             ) + symbol("x") + zero
-        }.compile()("x" to 2.toByte())
+        }.compile()("x" to MST.Numeric(2))
 
         assertEquals(res1, res2)
     }
 
     @Test
-    fun ring() {
+    fun byteRing() {
         val res1 = ByteRing.mstInRing {
             binaryOperation("+")(
                 unaryOperation("+")(
@@ -72,7 +72,7 @@ internal class TestESTreeAlgebras {
     }
 
     @Test
-    fun field() {
+    fun realField() {
         val res1 = RealField.mstInField {
             +(3 - 2 + 2 * number(1) + 1.0) + binaryOperation("+")(
                 (3.0 - (symbol("x") + (multiply(add(number(1.0), number(1.0)), 2) + 1.0))) * 3 - 1.0
@@ -91,4 +91,25 @@ internal class TestESTreeAlgebras {
 
         assertEquals(res1, res2)
     }
+
+    @Test
+    fun complexField() {
+        val res1 = ComplexField.mstInField {
+            +(3 - 2 + 2 * number(1) + 1.0) + binaryOperation("+")(
+                (3.0 - (symbol("x") + (multiply(add(number(1.0), number(1.0)), 2) + 1.0))) * 3 - 1.0
+                        + number(1),
+                number(1) / 2 + number(2.0) * one
+            ) + zero
+        }("x" to 2.0.toComplex())
+
+        val res2 = ComplexField.mstInField {
+            +(3 - 2 + 2 * number(1) + 1.0) + binaryOperation("+")(
+                (3.0 - (symbol("x") + (multiply(add(number(1.0), number(1.0)), 2) + 1.0))) * 3 - 1.0
+                        + number(1),
+                number(1) / 2 + number(2.0) * one
+            ) + zero
+        }.compile()("x" to 2.0.toComplex())
+
+        assertEquals(res1, res2)
+    }
 }
diff --git a/kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeExpressions.kt b/kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeOperationsSupport.kt
similarity index 56%
rename from kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeExpressions.kt
rename to kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeOperationsSupport.kt
index 3dc259cb3..72a4669d9 100644
--- a/kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeExpressions.kt
+++ b/kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeOperationsSupport.kt
@@ -3,17 +3,13 @@ package kscience.kmath.estree
 import kscience.kmath.ast.mstInExtendedField
 import kscience.kmath.ast.mstInField
 import kscience.kmath.ast.mstInSpace
-import kscience.kmath.expressions.Expression
-import kscience.kmath.expressions.StringSymbol
 import kscience.kmath.expressions.invoke
 import kscience.kmath.operations.RealField
-import kotlin.math.pow
 import kotlin.random.Random
 import kotlin.test.Test
 import kotlin.test.assertEquals
-import kotlin.time.measureTime
 
-internal class TestESTreeExpressions {
+internal class TestESTreeOperationsSupport {
     @Test
     fun testUnaryOperationInvocation() {
         val expression = RealField.mstInSpace { -symbol("x") }.compile()
@@ -36,21 +32,10 @@ internal class TestESTreeExpressions {
 
     @Test
     fun testMultipleCalls() {
-        val e1 =
-            RealField.mstInExtendedField { sin(symbol("x")).pow(4) - 6 * symbol("x") / tanh(symbol("x")) }.compile()
-
-        val e2 = Expression<Double> { a ->
-            val x = a.getValue(StringSymbol("x"))
-            kotlin.math.sin(x).pow(4) - 6 * x / kotlin.math.tanh(x)
-        }
-
-        var r = Random(0)
+        val e = RealField.mstInExtendedField { sin(symbol("x")).pow(4) - 6 * symbol("x") / tanh(symbol("x")) }.compile()
+        val r = Random(0)
         var s = 0.0
-        measureTime { repeat(1000000) { s += e1("x" to r.nextDouble()) } }.also(::println)
-        println(s)
-        s = 0.0
-        r = Random(0)
-        measureTime { repeat(1000000) { s += e2("x" to r.nextDouble()) } }.also(::println)
+        repeat(1000000) { s += e("x" to r.nextDouble()) }
         println(s)
     }
 }
diff --git a/kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeVariables.kt b/kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeVariables.kt
index b6f59247d..846120ee2 100644
--- a/kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeVariables.kt
+++ b/kmath-ast/src/jsTest/kotlin/kscience/kmath/estree/TestESTreeVariables.kt
@@ -9,13 +9,13 @@ import kotlin.test.assertFailsWith
 
 internal class TestESTreeVariables {
     @Test
-    fun testVariableWithoutDefault() {
+    fun testVariable() {
         val expr = ByteRing.mstInRing { symbol("x") }.compile()
         assertEquals(1.toByte(), expr("x" to 1.toByte()))
     }
 
     @Test
-    fun testVariableWithoutDefaultFails() {
+    fun testUndefinedVariableFails() {
         val expr = ByteRing.mstInRing { symbol("x") }.compile()
         assertFailsWith<NoSuchElementException> { expr() }
     }
diff --git a/kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmAlgebras.kt b/kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmConsistencyWithInterpreter.kt
similarity index 69%
rename from kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmAlgebras.kt
rename to kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmConsistencyWithInterpreter.kt
index a1687c1c7..013ae789d 100644
--- a/kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmAlgebras.kt
+++ b/kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmConsistencyWithInterpreter.kt
@@ -1,18 +1,18 @@
 package kscience.kmath.asm
 
-import kscience.kmath.ast.mstInField
-import kscience.kmath.ast.mstInRing
-import kscience.kmath.ast.mstInSpace
+import kscience.kmath.ast.*
 import kscience.kmath.expressions.invoke
 import kscience.kmath.operations.ByteRing
+import kscience.kmath.operations.ComplexField
 import kscience.kmath.operations.RealField
+import kscience.kmath.operations.toComplex
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
-internal class TestAsmAlgebras {
+internal class TestAsmConsistencyWithInterpreter {
     @Test
-    fun space() {
-        val res1 = ByteRing.mstInSpace {
+    fun mstSpace() {
+        val res1 = MstSpace.mstInSpace {
             binaryOperation("+")(
                 unaryOperation("+")(
                     number(3.toByte()) - (number(2.toByte()) + (multiply(
@@ -23,9 +23,9 @@ internal class TestAsmAlgebras {
 
                 number(1)
             ) + symbol("x") + zero
-        }("x" to 2.toByte())
+        }("x" to MST.Numeric(2))
 
-        val res2 = ByteRing.mstInSpace {
+        val res2 = MstSpace.mstInSpace {
             binaryOperation("+")(
                 unaryOperation("+")(
                     number(3.toByte()) - (number(2.toByte()) + (multiply(
@@ -36,13 +36,13 @@ internal class TestAsmAlgebras {
 
                 number(1)
             ) + symbol("x") + zero
-        }.compile()("x" to 2.toByte())
+        }.compile()("x" to MST.Numeric(2))
 
         assertEquals(res1, res2)
     }
 
     @Test
-    fun ring() {
+    fun byteRing() {
         val res1 = ByteRing.mstInRing {
             binaryOperation("+")(
                 unaryOperation("+")(
@@ -72,7 +72,7 @@ internal class TestAsmAlgebras {
     }
 
     @Test
-    fun field() {
+    fun realField() {
         val res1 = RealField.mstInField {
             +(3 - 2 + 2 * number(1) + 1.0) + binaryOperation("+")(
                 (3.0 - (symbol("x") + (multiply(add(number(1.0), number(1.0)), 2) + 1.0))) * 3 - 1.0
@@ -91,4 +91,25 @@ internal class TestAsmAlgebras {
 
         assertEquals(res1, res2)
     }
+
+    @Test
+    fun complexField() {
+        val res1 = ComplexField.mstInField {
+            +(3 - 2 + 2 * number(1) + 1.0) + binaryOperation("+")(
+                (3.0 - (symbol("x") + (multiply(add(number(1.0), number(1.0)), 2) + 1.0))) * 3 - 1.0
+                        + number(1),
+                number(1) / 2 + number(2.0) * one
+            ) + zero
+        }("x" to 2.0.toComplex())
+
+        val res2 = ComplexField.mstInField {
+            +(3 - 2 + 2 * number(1) + 1.0) + binaryOperation("+")(
+                (3.0 - (symbol("x") + (multiply(add(number(1.0), number(1.0)), 2) + 1.0))) * 3 - 1.0
+                        + number(1),
+                number(1) / 2 + number(2.0) * one
+            ) + zero
+        }.compile()("x" to 2.0.toComplex())
+
+        assertEquals(res1, res2)
+    }
 }
diff --git a/kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmExpressions.kt b/kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmOperationsSupport.kt
similarity index 96%
rename from kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmExpressions.kt
rename to kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmOperationsSupport.kt
index acd9e21ea..2ce52aa87 100644
--- a/kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmExpressions.kt
+++ b/kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmOperationsSupport.kt
@@ -9,7 +9,7 @@ import kotlin.random.Random
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
-internal class TestAsmExpressions {
+internal class TestAsmOperationsSupport {
     @Test
     fun testUnaryOperationInvocation() {
         val expression = RealField.mstInSpace { -symbol("x") }.compile()
diff --git a/kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmVariables.kt b/kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmVariables.kt
index 0ebc31be4..c91568dbf 100644
--- a/kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmVariables.kt
+++ b/kmath-ast/src/jvmTest/kotlin/kscience/kmath/asm/TestAsmVariables.kt
@@ -9,13 +9,13 @@ import kotlin.test.assertFailsWith
 
 internal class TestAsmVariables {
     @Test
-    fun testVariableWithoutDefault() {
+    fun testVariable() {
         val expr = ByteRing.mstInRing { symbol("x") }.compile()
         assertEquals(1.toByte(), expr("x" to 1.toByte()))
     }
 
     @Test
-    fun testVariableWithoutDefaultFails() {
+    fun testUndefinedVariableFails() {
         val expr = ByteRing.mstInRing { symbol("x") }.compile()
         assertFailsWith<NoSuchElementException> { expr() }
     }
diff --git a/kmath-ast/src/jvmTest/kotlin/kscience/kmath/ast/AsmTest.kt b/kmath-ast/src/jvmTest/kotlin/kscience/kmath/ast/AsmTest.kt
deleted file mode 100644
index 992f4024e..000000000
--- a/kmath-ast/src/jvmTest/kotlin/kscience/kmath/ast/AsmTest.kt
+++ /dev/null
@@ -1,23 +0,0 @@
-package kscience.kmath.ast
-
-import kscience.kmath.asm.compile
-import kscience.kmath.asm.expression
-import kscience.kmath.expressions.invoke
-import kscience.kmath.operations.Complex
-import kscience.kmath.operations.ComplexField
-import kotlin.test.Test
-import kotlin.test.assertEquals
-
-internal class AsmTest {
-    @Test
-    fun `compile MST`() {
-        val res = ComplexField.expression("2+2*(2+2)".parseMath())()
-        assertEquals(Complex(10.0, 0.0), res)
-    }
-
-    @Test
-    fun `compile MSTExpression`() {
-        val res = ComplexField.mstInField { number(2) + number(2) * (number(2) + number(2)) }.compile()()
-        assertEquals(Complex(10.0, 0.0), res)
-    }
-}