diff --git a/.github/workflows/vade.yml b/.github/workflows/vade.yml
index 4dbe781..944ac60 100644
--- a/.github/workflows/vade.yml
+++ b/.github/workflows/vade.yml
@@ -14,6 +14,6 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Install dependencies
-        run: sudo apt install --quiet -y make gcc python3 bash valgrind nasm
+        run: sudo apt update && sudo apt install --quiet -y make gcc python3 bash valgrind nasm
       - name: Build and test
         run: bin/vade clean test
diff --git a/Makefile b/Makefile
index e99475e..ee24791 100644
--- a/Makefile
+++ b/Makefile
@@ -62,7 +62,9 @@ ifeq ($(CC),$(CLANG))
 VALGRIND:=
 endif
 
-ifeq (, $(shell which $(VALGRIND) 2>/dev/null))
+ifneq (,$(VALGRIND))
+# Check if valgrind is operational (eg: not missing debuginfo etc..)
+ifneq (0, $(shell ($(VALGRIND) /bin/true 2>/dev/null ; echo $$?)))
 #$(error "NOT HAVE VALGRIND ($(VALGRIND))")
 RUN:=
 RUNTEST:=RUN
@@ -71,6 +73,8 @@ else
 VGRUN:=$(VALGRIND) $(VGOPTS)
 RUNTEST:=VGRUN
 endif
+endif
+
 RUNPYTEST:=RUNPY
 
 ifeq (, $(shell which $(GCOV) 2>/dev/null))
diff --git a/vade/src/open_close/open_close.c b/vade/src/open_close/open_close.c
new file mode 100644
index 0000000..ba0e860
--- /dev/null
+++ b/vade/src/open_close/open_close.c
@@ -0,0 +1,40 @@
+#include "open_close.h"
+#include <stdlib.h>
+#include <string.h>
+
+printer_t *printer() {
+    printer_t *p = calloc(1, sizeof(printer_t));
+    p->text = calloc(1, 1);
+}
+void printer_free(printer_t *p) {
+    if (p) {
+        free(p->text);
+        free(p);
+    }
+}
+void printer_print(printer_t *p, char *s) {
+    p->text = realloc(p->text, strlen(p->text) + strlen(s) + 1);
+    strcat(p->text, s);
+}
+
+#include "test/test.h"
+TEST_F(open_close, Printer_001_empty) {
+    printer_t *p = printer();
+    EXPECT_STREQ("", p->text);
+    printer_free(p);
+}
+
+TEST_F(open_close, Printer_002_one_print) {
+    printer_t *p = printer();
+    printer_print(p, "hello");
+    EXPECT_STREQ("hello", p->text);
+    printer_free(p);
+}
+
+TEST_F(open_close, Printer_003_two_prints) {
+    printer_t *p = printer();
+    printer_print(p, "hello");
+    printer_print(p, " world!\n");
+    EXPECT_STREQ("hello world!\n", p->text);
+    printer_free(p);
+}
diff --git a/vade/src/open_close/open_close.h b/vade/src/open_close/open_close.h
new file mode 100644
index 0000000..46cfdeb
--- /dev/null
+++ b/vade/src/open_close/open_close.h
@@ -0,0 +1,5 @@
+typedef struct {
+    char *text;
+} printer_t;
+extern printer_t *printer();
+extern void printer_print(printer_t *p, char *s);