support/testing: micropython: add micropython-lib test

Commit 8f403f0 "package/micropython-lib: merge with, and install
as part of micropython" brought micropython library within the
package.

This commit improves the micropython runtime test by enabling the
micropython-lib and by also adding a runtime test using one of its
module. We choose to use the gzip module, and check whther decodign q
simple gziped file works; the micropython-lib gzip can only decompress,
so we need to prepare it from the shell.

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

support/testing/tests/package/test_micropython.py

@@ -7,6 +7,7 @@ class TestMicroPython(infra.basetest.BRTest):
     config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
         f"""
         BR2_PACKAGE_MICROPYTHON=y
+        BR2_PACKAGE_MICROPYTHON_LIB=y
         BR2_ROOTFS_OVERLAY="{infra.filepath("tests/package/test_micropython/rootfs-overlay")}"
         BR2_TARGET_ROOTFS_CPIO=y
         # BR2_TARGET_ROOTFS_TAR is not set
@@ -64,5 +65,15 @@ class TestMicroPython(infra.basetest.BRTest):
         output = self.run_upy_code(py_code)
         self.assertEqual(output[0], expected_output)
 
-        # Finally, Check a small script can execute.
+        # Check a small script can execute.
         self.assertRunOk("/root/mandel.py", timeout=10)
+
+        # Check we can use a micropython-lib module.
+        msg = "Hello Buildroot!"
+        filename = "file.txt"
+        gz_filename = f"{filename}.gz"
+        self.assertRunOk(f"echo '{msg}' > {filename}")
+        self.assertRunOk(f"gzip {filename}")
+        out, ret = self.emulator.run(f"/root/zcat.py {gz_filename}")
+        self.assertEqual(ret, 0)
+        self.assertEqual(out[0], msg)

support/testing/tests/package/test_micropython/rootfs-overlay/root/zcat.py

@@ -0,0 +1,15 @@
+#! /usr/bin/env micropython
+
+import gzip
+import sys
+
+
+def main(fname):
+    with open(fname, "rb") as f:
+        with gzip.GzipFile(fileobj=f) as g:
+            s = g.read()
+            print(s.decode("UTF-8"), end="")
+
+
+if __name__ == "__main__":
+    main(sys.argv[1])