test, chore: adjusted platformio.ini accordingly and test comments

Author: Inmoresentum

platformio.ini

@@ -12,6 +12,12 @@
 platform = espressif32
 board = esp32-s3-devkitc-1
 framework = arduino
+test_framework = unity
+test_build_src = yes
+monitor_speed = 115200
+build_flags =
+    -DUNITY_INCLUDE_DOUBLE
+    -DUNITY_DOUBLE_PRECISION=1e-12
 lib_deps =
     https://github.com/eloquentarduino/EloquentTinyML.git
     https://github.com/arrhythmia-detection/tflm_esp32.git

test/test_on_esp32_board/test_lib_tflm_wrapper_esp32.cpp

@@ -49,7 +49,7 @@ void test_prediction_class() {
 
 void test_prediction_output_range() {
     testMLP.predict(test_inputs);
-    // Check if all output probabilities are between 0 and 1
+    // Check if all output probabilities are between 0 and 1 (SOFTMAX Activiation Function)
     for (u_int16_t i = 0; i < TF_NUM_OUTPUTS; i++) {
         TEST_ASSERT_TRUE(testMLP.outputs[i] >= 0.0f && testMLP.outputs[i] <= 1.0f);
     }