Add failing test

Author: znicholls

tests/unit/test_error_v_creation.py

@@ -0,0 +1,47 @@
+"""
+Tests of `example_fgen_basic.error_v.creation`
+
+Note that this is the only test of the Fortran code.
+I haven't written unit tests for the Fortran directly
+(deliberately, just to see how it goes).
+"""
+
+from example_fgen_basic.error_v import ErrorV
+from example_fgen_basic.error_v.creation import create_error
+
+
+def test_create_error_odd():
+    res = create_error(1.0)
+
+    assert isinstance(res, ErrorV)
+
+    assert res.code == 0
+    assert res.message == ""
+
+
+def test_create_error_even():
+    res = create_error(2.0)
+
+    assert isinstance(res, ErrorV)
+
+    assert res.code != 0
+    assert res.code == 1
+    assert res.message == "Even number supplied"
+
+
+def test_create_error_negative():
+    res = create_error(-1.0)
+
+    assert isinstance(res, ErrorV)
+
+    assert res.code == 2
+    assert res.message == "Negative number supplied"
+
+
+# Tests to write:
+# - if we create more errors than we have available, we don't segfault.
+#   Instead, we should get an error back.
+#   That error should just use the instance ID of the last available array index
+#   (it is ok to overwrite an already used error to avoid a complete failure,
+#   but we should probably include that we did this in the error message).
+# - we can resize the available number of error instances to avoid hitting limits