[python] Add a simple test

python/Makefile

@@ -180,3 +180,7 @@ $(eval $(call rule_for, \
 ))
 
 $(call object_for,$(python_src)): $(BUILD_DIR)/python/port/genhdr/qstrdefs.generated.h
+
+tests_src += $(addprefix python/test/,\
+  mandelbrot.cpp \
+)

python/test/mandelbrot.cpp

@@ -0,0 +1,39 @@
+#include <quiz.h>
+#include <assert.h>
+#include <python/port/port.h>
+
+
+class TestExecutionEnvironment : public MicroPython::ExecutionEnvironment {
+public:
+  void printText(const char * text, size_t length) override;
+};
+
+void TestExecutionEnvironment::printText(const char * text, size_t length) {
+  quiz_print(text);
+}
+
+static constexpr int k_pythonHeapSize = 16384;
+static char s_pythonHeap[k_pythonHeapSize*100];
+
+static const char * s_mandelbrotScript = R"(#
+def mandelbrot(N_iteration):
+  for x in range(320):
+    for y in range(222):
+      z = complex(0,0)
+      c = complex(3.5*x/319-2.5, -2.5*y/221+1.25)
+      i = 0
+      while (i < N_iteration) and abs(z) < 2:
+        i = i + 1
+        z = z*z+c
+      rgb = int(255*i/N_iteration)
+      col = (int(rgb),int(rgb*0.75),int(rgb*0.25))
+mandelbrot(2)
+print('ok')
+)";
+
+QUIZ_CASE(python_mandelbrot) {
+  MicroPython::init(s_pythonHeap, s_pythonHeap + k_pythonHeapSize);
+  TestExecutionEnvironment env;
+  env.runCode(s_mandelbrotScript);
+  MicroPython::deinit();
+}