tests: Add issuegen test for bursts of issue snippets

Tests to ensure that #87
does not happen.

tests/kola/basic/test-issue.sh

@@ -36,6 +36,7 @@ ok "symlink"
 # If SSH keys are present, check that SSH keys snippets were generated by 
 # `gensnippet_ssh_keys` and shown by `agetty`.
 if test -n "$(find /etc/ssh -name 'ssh_host_*_key' -print -quit)"; then
+    sleep 2
     faketty agetty_output.txt agetty --show-issue
     assert_file_has_content agetty_output.txt 'SSH host key:*'
     ok "gensnippet_ssh_keys"
@@ -44,9 +45,26 @@ fi
 # Check that a new issue snippet is generated when a .issue file is dropped into 
 # the issue run directory.
 echo 'foo' > ${ISSUE_RUN_SNIPPETS_PATH}/10_foo.issue
-sleep 1
+sleep 2
 faketty agetty_output.txt agetty --show-issue
 assert_file_has_content agetty_output.txt 'foo'
-ok "display new issue snippet"
+ok "display new single issue snippet"
+
+# Check that a large burst of .issue files dropped into the issue run directory
+# will all get displayed, and that we don't hit any systemd 'start-limit-hit' 
+# failures
+for i in {1..150};
+do
+    echo "Issue snippet: $i" > ${ISSUE_RUN_SNIPPETS_PATH}/${i}_spam.issue
+done
+sleep 2
+faketty agetty_output.txt agetty --show-issue
+for i in {1..150};
+do
+    assert_file_has_content agetty_output.txt "Issue snippet: $i"
+done
+systemctl status ${PKG_NAME}-issuegen.path > issuegen_status.txt
+assert_not_file_has_content issuegen_status.txt "unit-start-limit-hit"
+ok "display burst of new issue snippets"
 
 tap_finish