tests/test_tools: test to get a command return value

Get the output of a one line command without other garbage messages.

tests/test_tools/main.c

@@ -15,6 +15,8 @@
  */
 
 #include <stdio.h>
+#include <string.h>
+#include <ctype.h>
 
 #include "shell_commands.h"
 #include "shell.h"
@@ -65,9 +67,40 @@ static int cmd_shellping(int argc, char **argv)
 }
 
 
+/**
+ * @brief Uppercase the first word
+ *
+ * First argument is read, converted to uppercase and printed with a newline.
+ *
+ * @param[in] argc Number of arguments
+ * @param[in] argv Array of arguments
+ *
+ * @return 0 on success
+ *
+ */
+static int cmd_toupper(int argc, char **argv)
+{
+ if (argc != 2) {
+ puts("Invalid number of argument");
+ printf("Usage: %s <word>\n", argv[0]);
+ return 1;
+ }
+
+ size_t len = strlen(argv[1]);
+ for (size_t i = 0; i < len; i++) {
+ char c = toupper(argv[1][i]);
+ putchar(c);
+ }
+ putchar('\n');
+
+ return 0;
+}
+
+
 static const shell_command_t shell_commands[] = {
  { "shellping", "Just print 'shellpong'", cmd_shellping },
  { "true", "do nothing, successfully", cmd_true },
+ { "toupper", "uppercase first argument", cmd_toupper },
  { NULL, NULL, NULL }
 };
 

tests/test_tools/tests/01-run.py

@@ -38,12 +38,20 @@ def _test_no_local_echo(child):
  assert res == 0, "There should have been a timeout and not match stdin"
 
 
+def _test_clean_output(child):
+ """Verify that only what the nodes sends is received."""
+ child.sendline('toupper lowercase')
+ retline = child.readline()
+ assert retline.strip() == 'LOWERCASE'
+
+
 def testfunc(child):
  """Run some tests to verify the board under test behaves correctly.
 
  It currently tests:
 
  * local echo
+ * getting some test output without other messages
  """
  child.expect_exact("Running 'tests_tools' application")
 
@@ -55,6 +63,9 @@ def testfunc(child):
  # The node should still answer after the previous one
  _shellping(child)
 
+ # Check that the output is clean without extra terminal output
+ _test_clean_output(child)
+
 
 if __name__ == "__main__":
  sys.exit(run(testfunc))