Add unit tests for preprocess arg parsing

tests/test_preprocess.py

@@ -0,0 +1,40 @@
+from hexrd.preprocess.profiles import (
+    Eiger_Arguments,
+    Dexelas_Arguments,
+    HexrdScript_Arguments,
+)
+
+
+# test load/safe with defaults
+def test_save_load_defaults_eiger():
+    eargs = Eiger_Arguments()
+    buffer = eargs.dump_config()
+    args = HexrdScript_Arguments.load_from_config(buffer)
+    assert eargs == args
+
+
+def test_save_load_defaults_dexelas():
+    eargs = Dexelas_Arguments()
+    buffer = eargs.dump_config()
+    args = HexrdScript_Arguments.load_from_config(buffer)
+    assert eargs == args
+
+
+# test load/safe with modified parameters
+def test_save_load_eiger():
+    eargs = Eiger_Arguments()
+    eargs.base_dir = "/data"
+    eargs.num_frames = 1
+    buffer = eargs.dump_config()
+    args = HexrdScript_Arguments.load_from_config(buffer)
+    assert eargs == args
+
+
+def test_save_load_dexelas():
+    eargs = Dexelas_Arguments()
+    eargs.base_dir = "/data"
+    eargs.num_frames = 1
+    eargs.panel_opts["FF1"] = {("add-row", 1000)}
+    buffer = eargs.dump_config()
+    args = HexrdScript_Arguments.load_from_config(buffer)
+    assert eargs == args