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"""Test functionality related to prompts."""
import pytest
from langchain.prompts.prompt import PromptTemplate
def test_prompt_valid() -> None:
"""Test prompts can be constructed."""
template = "This is a {foo} test."
input_variables = ["foo"]
prompt = PromptTemplate(input_variables=input_variables, template=template)
assert prompt.template == template
assert prompt.input_variables == input_variables
def test_prompt_from_template() -> None:
"""Test prompts can be constructed from a template."""
# Single input variable.
template = "This is a {foo} test."
prompt = PromptTemplate.from_template(template)
expected_prompt = PromptTemplate(template=template, input_variables=["foo"])
assert prompt == expected_prompt
# Multiple input variables.
template = "This {bar} is a {foo} test."
prompt = PromptTemplate.from_template(template)
expected_prompt = PromptTemplate(template=template, input_variables=["bar", "foo"])
assert prompt == expected_prompt
# Multiple input variables with repeats.
template = "This {bar} is a {foo} test {foo}."
prompt = PromptTemplate.from_template(template)
expected_prompt = PromptTemplate(template=template, input_variables=["bar", "foo"])
assert prompt == expected_prompt
def test_prompt_missing_input_variables() -> None:
"""Test error is raised when input variables are not provided."""
template = "This is a {foo} test."
input_variables: list = []
with pytest.raises(ValueError):
PromptTemplate(input_variables=input_variables, template=template)
def test_prompt_extra_input_variables() -> None:
"""Test error is raised when there are too many input variables."""
template = "This is a {foo} test."
input_variables = ["foo", "bar"]
with pytest.raises(ValueError):
PromptTemplate(input_variables=input_variables, template=template)
def test_prompt_wrong_input_variables() -> None:
"""Test error is raised when name of input variable is wrong."""
template = "This is a {foo} test."
input_variables = ["bar"]
with pytest.raises(ValueError):
PromptTemplate(input_variables=input_variables, template=template)
def test_prompt_from_examples_valid() -> None:
"""Test prompt can be successfully constructed from examples."""
template = """Test Prompt:
Question: who are you?
Answer: foo
Question: what are you?
Answer: bar
Question: {question}
Answer:"""
input_variables = ["question"]
example_separator = "\n\n"
prefix = """Test Prompt:"""
suffix = """Question: {question}\nAnswer:"""
examples = [
"""Question: who are you?\nAnswer: foo""",
"""Question: what are you?\nAnswer: bar""",
]
prompt_from_examples = PromptTemplate.from_examples(
examples,
suffix,
input_variables,
example_separator=example_separator,
prefix=prefix,
)
prompt_from_template = PromptTemplate(
input_variables=input_variables, template=template
)
assert prompt_from_examples.template == prompt_from_template.template
assert prompt_from_examples.input_variables == prompt_from_template.input_variables
def test_prompt_invalid_template_format() -> None:
"""Test initializing a prompt with invalid template format."""
template = "This is a {foo} test."
input_variables = ["foo"]
with pytest.raises(ValueError):
PromptTemplate(
input_variables=input_variables, template=template, template_format="bar"
)
def test_prompt_from_file() -> None:
"""Test prompt can be successfully constructed from a file."""
template_file = "tests/unit_tests/data/prompt_file.txt"
input_variables = ["question"]
prompt = PromptTemplate.from_file(template_file, input_variables)
assert prompt.template == "Question: {question}\nAnswer:"
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