tests: fix tsv export tests

tests/test_rtdc_export_tsv.py

@@ -1,56 +1,49 @@
-import io
-from os.path import join
-import tempfile
-
 import dclab
 
 from helper_methods import example_data_dict
 
 
-def test_tsv_export():
+def test_tsv_export(tmp_path):
     keys = ["area_um", "deform", "time", "frame", "fl3_width"]
     ddict = example_data_dict(size=222, keys=keys)
     ds = dclab.new_dataset(ddict)
 
-    edest = tempfile.mkdtemp()
-    f1 = join(edest, "test.tsv")
-    f2 = join(edest, "test_unicode.tsv")
+    f1 = tmp_path / "test.tsv"
+    f2 = tmp_path / "test_unicode.tsv"
 
     ds.export.tsv(f1, keys, override=True)
     ds.export.tsv(f2, [u"area_um", u"deform", u"time",
                        u"frame", u"fl3_width"], override=True)
 
-    with io.open(f1) as fd:
+    with f1.open("r") as fd:
         a1 = fd.read()
 
-    with io.open(f2) as fd:
+    with f2.open("r") as fd:
         a2 = fd.read()
 
     assert a1 == a2
     assert len(a1) != 0
 
 
-def test_tsv_override():
+def test_tsv_override(tmp_path):
     keys = ["area_um", "deform", "time", "frame", "fl3_width"]
     ddict = example_data_dict(size=212, keys=keys)
     ds = dclab.new_dataset(ddict)
 
-    edest = tempfile.mkdtemp()
-    f1 = join(edest, "test.tsv")
+    f1 = tmp_path / "test.tsv"
     ds.export.tsv(f1, keys, override=True)
     try:
-        ds.export.tsv(f1[:-4], keys, override=False)
+        ds.export.tsv(f1.with_name(f1.stem), keys, override=False)
     except OSError:
         pass
     else:
         raise ValueError("Should append .tsv and not override!")
 
 
-def test_tsv_not_filtered():
+def test_tsv_not_filtered(tmp_path):
     keys = ["area_um", "deform", "time", "frame", "fl3_width"]
     ddict = example_data_dict(size=127, keys=keys)
     ds = dclab.new_dataset(ddict)
 
-    edest = tempfile.mkdtemp()
-    f1 = join(edest, "test.tsv")
+    f1 = tmp_path / "test.tsv"
     ds.export.tsv(f1, keys, filtered=False)