Implement tests and stubs for functions under test

1 files changed, 40 insertions, 0 deletions

diff --git a/tests/qc/test_cells.py b/tests/qc/test_cells.py
new file mode 100644
index 0000000..b105286
--- /dev/null
+++ b/tests/qc/test_cells.py
@@ -0,0 +1,40 @@
+"""Test that values in cells within a line fulfill the required criteria"""
+
+import pytest
+from hypothesis import given
+from hypothesis import strategies as st
+
+from quality_control.errors import InvalidValue
+from quality_control.average import valid_value as avg_valid_value
+from quality_control.standard_error import valid_value as se_valid_value
+
+@given(num_str=st.from_regex("^(?!([0-9]+\.([0-9]{3}|[0-9]{6,}))).*", fullmatch=True))
+def test_cell_value_errors_with_invalid_inputs(num_str):
+    with pytest.raises(InvalidValue):
+        avg_valid_value(num_str)
+    with pytest.raises(InvalidValue):
+        se_valid_value(num_str)
+
+@given(num_str=st.from_regex("^[0-9]+\.([0-9]{1,2}|[0-9]{4,}$)", fullmatch=True))
+def test_cell_average_value_errors_if_not_three_decimal_places(num_str):
+    with pytest.raises(InvalidValue):
+        avg_valid_value(num_str)
+
+@given(num_str=st.from_regex("^[0-9]+\.[0-9]{3}$", fullmatch=True))
+def test_cell_average_value_pass_if_three_decimal_places(num_str):
+    processed = avg_valid_value(num_str)
+    assert (
+        isinstance(processed, float) and
+        processed == float(num_str)) 
+
+@given(num_str=st.from_regex("^[0-9]+\.([0-9]{0,5}$)", fullmatch=True))
+def test_cell_standard_error_value_errors_if_less_than_six_decimal_places(num_str):
+    with pytest.raises(InvalidValue):
+        se_valid_value(num_str)
+
+@given(num_str=st.from_regex("^[0-9]+\.[0-9]{6,}$", fullmatch=True))
+def test_cell_standard_error_value_pass_if_six_or_more_decimal_places(num_str):
+    processed = se_valid_value(num_str)
+    assert (
+        isinstance(processed, float) and
+        processed == float(num_str))