Headless testing with AppTest and st.form

Using Streamlit
1

Greetings, is it possible in the current release of streamlit to use AppTest with st.form? If so, what is the syntax for accessing elements in the form? In the documentation, I see references to st.form_submit_button but not st.form itself.

2

Answering my own questions here: as of streamlit 1.28.0 running AppTest is basically agnostic as to whether fields are in an st.form, so I didn’t have to do anything extra.

For example, the following should behave the same with testing:

# with form
with st.form("Some form", key="my_form"):
    num = st.number_input("Select a number",0,value=10000,key="my_num")
    if st.form_submit_button("Check number",key="my_button"):
        st.write(num)

# without form
num = st.number_input("Select a number",0,value=10000,key="num")
if st.button("Check number",key="my_button"):
        st.write(num)

Which will simply require:

from streamlit.testing.v1 import AppTest 
at = AppTest.from_file("path/to/script.py")
test_num = 2
at.run()
at.number_input(f"my_num").set_value(test_num)
at.button[0].click()
at.run()
3

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