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microsoft--semantic-kernel/python/tests/unit/template_engine/blocks/test_var_block.py
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chore: import upstream snapshot with attribution
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Python

# Copyright (c) Microsoft. All rights reserved.
import logging
from pytest import mark, raises
from semantic_kernel.exceptions import VarBlockSyntaxError
from semantic_kernel.exceptions.template_engine_exceptions import VarBlockRenderError
from semantic_kernel.functions.kernel_arguments import KernelArguments
from semantic_kernel.kernel import Kernel
from semantic_kernel.template_engine.blocks.block_types import BlockTypes
from semantic_kernel.template_engine.blocks.var_block import VarBlock
logger = logging.getLogger(__name__)
def test_init():
var_block = VarBlock(content="$test_var")
assert var_block.content == "$test_var"
assert var_block.name == "test_var"
assert var_block.type == BlockTypes.VARIABLE
def test_it_trims_spaces():
assert VarBlock(content=" $x ").content == "$x"
@mark.parametrize(
"name",
[
"0",
"1",
"a",
"_",
"01",
"01a",
"a01",
"_0",
"a01_e",
"_a01e",
],
)
def test_valid_syntax(name):
target = VarBlock(content=f" ${name} ")
result = target.render(Kernel(), KernelArguments(**{name: "value"}))
assert target.name == name
assert result == "value"
@mark.parametrize(
"content",
["$", "$test-var", "test_var", "$a>b", "$."],
ids=["prefix_only", "invalid_characters", "no_prefix", "invalid_characters2", "invalid_characters3"],
)
def test_syntax_errors(content):
match = content.replace("$", "\\$") if "$" in content else content
with raises(VarBlockSyntaxError, match=rf".*{match}.*"):
VarBlock(content=content)
def test_render():
var_block = VarBlock(content="$test_var")
rendered_value = var_block.render(Kernel(), KernelArguments(test_var="test_value"))
assert rendered_value == "test_value"
def test_render_variable_not_found():
var_block = VarBlock(content="$test_var")
rendered_value = var_block.render(Kernel(), KernelArguments())
assert rendered_value == ""
def test_render_no_args():
target = VarBlock(content="$var")
result = target.render(Kernel())
assert result == ""
class MockNonString(str):
def __str__(self):
raise ValueError("This is not a string")
def test_not_string():
target = VarBlock(content="$var")
with raises(VarBlockRenderError):
target.render(Kernel(), KernelArguments(var=MockNonString("1")))