Exclude "test*" folder by default from build process

platformio/builder/tools/platformio.py

@@ -27,7 +27,8 @@ from platformio.util import pioversion_to_intstr
 SRC_BUILD_EXT = ["c", "cpp", "S", "spp", "SPP", "sx", "s", "asm", "ASM"]
 SRC_HEADER_EXT = ["h", "hpp"]
 SRC_DEFAULT_FILTER = " ".join([
-    "+<*>", "-<.git%s>" % sep, "-<svn%s>" % sep, "-<example*%s>" % sep
+    "+<*>", "-<.git%s>" % sep, "-<svn%s>" % sep, "-<example*%s>" % sep,
+    "-<test*%s>" % sep
 ])