diff --git a/README.md b/README.md
index e51e1c0..58fae6b 100644
--- a/README.md
+++ b/README.md
@@ -153,3 +153,26 @@ Before calling `execute()`, you can preload input port values using `mockinput()
 For instance, `.mockinput(0, 4)` will preload input port 0 with value 4. Psm statements like `input s0, 0` will load 4 into register s4. 
 opbtest acutally replaces the statement with `load s0, 4`, so no actual input statements will be processed.
 
+### Debugging Tests
+
+Somethings, a failing test does not clearly indicate the underlying problem. The Assembly source file is not the same source code as the code that is simulated to get to this result.
+For example, when mocking, parts are replaced, and when registers are setup, extra loads are done. If you want to take a look at the Assembly file to be compiled and interpreted, add the following to your `setUp` testcase:
+
+```python
+    def setUp(self):
+        self.do_not_cleanup_files()
+```
+
+This will leave the generated Assembly files in the test directory after test execution:
+
+1. tmp_[timestamp].psm4
+2. tmp_[timestamp].gen.psm - PicoBlaze macro expanded instructionset
+3. tmp_[timestamp].fmt, .log metafiles
+4. tmp_[timestamp].mem - binary.
+
+Run the assembler yourself:
+
+1. compiling: `opbasm --6 -c file.psm4` (or `--3` for PicoBlaze 3)
+2. simulating: `opbsim -v -m:file.mem --pb6` (or `--pb3` for PicoBlaze 3)
+
+For more information about the commandline flags, see the [Open PicoBlaze Assembler documentation](http://kevinpt.github.io/opbasm/).
\ No newline at end of file
diff --git a/test/functions.psm4 b/test/functions.psm4
index 2fc1270..551697b 100644
--- a/test/functions.psm4
+++ b/test/functions.psm4
@@ -19,6 +19,15 @@ func func1(s1 is val) : 1 {
     load val, 52
 }
 
+proc func_with_brackets_in() {
+    if(s0 == 0) {
+        if(s1 == 0) {
+            load s2, 2
+        }
+    }
+    add s2, 1
+}
+
 main:
     load s2, 11
     add s2, 1
diff --git a/test/test_functions.py b/test/test_functions.py
index 91cc7a5..2826c10 100644
--- a/test/test_functions.py
+++ b/test/test_functions.py
@@ -21,6 +21,10 @@ class TestFunctions(OpbTestCase):
         except AssertionError:
             pass
 
+    def test_proc_with_brackets_in(self):
+        assert_that = self.load_file("functions.psm4").testproc("func_with_brackets_in").execute()
+        assert_that.regs(["s2"]).contains([3])
+
     def test_proc_with_tab_statements_replaced_well(self):
         assert_that = self.load_file("functions.psm4").testproc("proc3").replace("add bla, 1", "add bla, 2").execute()
         assert_that.reg("s5").contains(2)