diff --git a/core/math.ktt b/core/math.ktt
index 3de2f7d..a3d88d4 100644
--- a/core/math.ktt
+++ b/core/math.ktt
@@ -89,6 +89,7 @@ Object extend: Fixnum With: {
     sqrt = { (self _FixnumToFloat) sqrt }.
     sin = { MathFFI sin: (self _FixnumToFloat) }.
     cos = { MathFFI cos: (self _FixnumToFloat) }.
+    asComplex = { Complex clone setRe: self Im: 0 }.
 
     toString = { self _FixnumToString }.
     toStringRadix: r = { self _FixnumToStringRadix: r }.
@@ -164,6 +165,7 @@ Object extend: Bignum With: {
 
     neg = { self _BignumNeg }.
     sqrt = { (self _BignumToFloat) sqrt }.
+    asComplex = { Complex clone setRe: self Im: 0 }.
 
     eqFixnum: lhs = { (lhs _FixnumToBignum) _BignumEq: self }.
     neFixnum: lhs = { (lhs _FixnumToBignum) _BignumNe: self }.
@@ -234,6 +236,7 @@ Object extend: Ratio With: {
 
     neg = { self _RatioNeg }.
     sqrt = { (self _RatioToFloat) sqrt }.
+    asComplex = { Complex clone setRe: self Im: 0 }.
 
     eqFixnum: lhs = { (lhs _FixnumToRatio) _RatioEq: self }.
     neFixnum: lhs = { (lhs _FixnumToRatio) _RatioNe: self }.
@@ -339,6 +342,7 @@ Object extend: Float With: {
     geFloat: lhs = { lhs _FloatGe: self }.
 
     neg = { self _FloatNeg }.
+    asComplex = { Complex clone setRe: self Im: 0 }.
     sin = { MathFFI sin: self }.
     cos = { MathFFI cos: self }.
     toString = { self _FloatToString }.
diff --git a/run_tests.py b/run_tests.py
index 08cdc3d..ac90937 100644
--- a/run_tests.py
+++ b/run_tests.py
@@ -16,13 +16,13 @@
 SYSTEM_INIT = "core/system.ktt"
 OS_INIT = "core/os.ktt"
 def build_command(debug: bool) -> list[str]:
-    cmd = ["cargo", "build", "--bin", "kette"]
+    cmd = ["cargo", "build", "--bin", "vm"]
     if not debug:
         cmd.append("--release")
     return cmd
 
 def run_command(debug: bool) -> list[str]:
-    cmd = ["cargo", "run", "--bin", "kette"]
+    cmd = ["cargo", "run", "--bin", "vm"]
     if not debug:
         cmd.append("--release")
     cmd.extend([
diff --git a/tests/disposable_using.ktt b/tests/disposable_using.ktt
index 8c0f1df..1f8ec1f 100644
--- a/tests/disposable_using.ktt
+++ b/tests/disposable_using.ktt
@@ -1,3 +1,6 @@
+// expect:
+// disposable-using: ok
+
 Module open: 'Test::DisposableUsing.
 Module use: 'OS.
 
diff --git a/tests/file_disposable.ktt b/tests/file_disposable.ktt
index e3c0ac1..fa92e55 100644
--- a/tests/file_disposable.ktt
+++ b/tests/file_disposable.ktt
@@ -1,3 +1,9 @@
+// expect:
+// 9326
+// 9326
+// 56
+// file-disposable: ok
+
 Module open: 'Test::FileDisposable.
 Module use: 'System & 'OS.
 
diff --git a/tests/init_runtime_demo.ktt b/tests/init_runtime_demo.ktt
index a33690a..b882659 100644
--- a/tests/init_runtime_demo.ktt
+++ b/tests/init_runtime_demo.ktt
@@ -1,3 +1,17 @@
+// expect:
+// Reading: core/init.ktt (Size: 9326):
+// VM _ModuleOpen: 'Core.
+// 
+// 54
+// incredible
+// Module demo start
+// 45
+// 42
+// 3
+// 42
+// Module demo end
+// App
+
 Module open: 'Test::RuntimeDemo.
 Module use: 'System.
 Module use: 'OS.
@@ -8,7 +22,7 @@ Module use: 'OS.
         eachLine: [ | line |
             line println
         ]
-        First: 3
+        First: 2
 ].
 
 NewGlobal := None.
diff --git a/tests/linked_list_chasing.ktt b/tests/linked_list_chasing.ktt
index 646fa67..4e39559 100644
--- a/tests/linked_list_chasing.ktt
+++ b/tests/linked_list_chasing.ktt
@@ -1,3 +1,5 @@
+// expect:
+
 Module open: 'LinkedListChasing.
 Module use: 'Collections.
 
diff --git a/tests/mitternacht.ktt b/tests/mitternacht.ktt
index 0dceb47..b66d3ba 100644
--- a/tests/mitternacht.ktt
+++ b/tests/mitternacht.ktt
@@ -1,14 +1,19 @@
+// expect:
+// -1 + 1i
+// -1 - 1i
+
 Module open: 'Test::Mitternacht.
+Module use: 'Math.
 
-Math = { 
-    rootsOfA: a B: b C: c = {
+Quadratic = {
+    printRootsOfA: a B: b C: c = {
         disc = (b * b) - (4 * a * c).
         sqrtDisc = disc sqrt.
         denom = 2 * a.
-        root1 = ((0 - b) + sqrtDisc) / denom.
-        root2 = ((0 - b) - sqrtDisc) / denom.
-        { root1. root2 }
+        negB = 0 - b.
+        ((negB + sqrtDisc) / denom) toString println.
+        ((negB - sqrtDisc) / denom) toString println.
     }.
 }.
 
-res = Math rootsOfA: 1 B: 2 C: 2
+Quadratic printRootsOfA: 1 B: 2 C: 2.
diff --git a/tests/proxy_ctype_accessors.ktt b/tests/proxy_ctype_accessors.ktt
index d0e730f..7e4b999 100644
--- a/tests/proxy_ctype_accessors.ktt
+++ b/tests/proxy_ctype_accessors.ktt
@@ -1,3 +1,6 @@
+// expect:
+// proxy-ctype-accessors: ok
+
 Module open: 'Test::ProxyCTypeAccessors.
 Module use: 'Alien & 'System.
 
diff --git a/tests/proxy_ctype_nested_struct.ktt b/tests/proxy_ctype_nested_struct.ktt
index 9acff0a..9273cdc 100644
--- a/tests/proxy_ctype_nested_struct.ktt
+++ b/tests/proxy_ctype_nested_struct.ktt
@@ -1,3 +1,6 @@
+// expect:
+// proxy-ctype-nested-struct: ok
+
 Module open: 'Test::ProxyCTypeNestedStruct.
 Module use: 'Alien.