datacite: add conversion fixtures

The `test_datacite_conversions` function will compare an input
(datacite) document to an expected output (release entity as JSON). This
way, it should not be too hard to add more cases by adding: input,
output - and by increasing the counter in the range loop within the
test.

To view input and result side by side with vim, change into the test
directory and run:

    tests/files/datacite $ ./caseview.sh 18

1 files changed, 110 insertions, 0 deletions

diff --git a/python/tests/files/datacite/datacite_result_14.json b/python/tests/files/datacite/datacite_result_14.json
new file mode 100644
index 00000000..94c00472
--- /dev/null
+++ b/python/tests/files/datacite/datacite_result_14.json
@@ -0,0 +1,110 @@
+{
+    "extra": {
+        "datacite": {
+            "subjects": [
+                {
+                    "subject": "Crystal Structure"
+                },
+                {
+                    "subject": "Experimental 3D Coordinates"
+                },
+                {
+                    "subject": "Crystal System"
+                },
+                {
+                    "subject": "Space Group"
+                },
+                {
+                    "subject": "Cell Parameters"
+                },
+                {
+                    "subject": "Crystallography"
+                },
+                {
+                    "subject": "bis(mu~2~-5-(3,5-Di-t-butylphenyl)-15-(4-(2-(diphenylphosphino)ethynyl)phenyl)-2,8,12,18-tetrahexyl-3,7,13,17-tetramethylporphyrinato)-(5,15-bis(3,5-di-t-butylphenyl)-2,8,12,18-tetraethyl-3,7,13,17-tetramethylporphyrinato)-di-nickel-ruthenium chloroform solvate"
+                }
+            ],
+            "relations": [
+                {
+                    "relationType": "IsSupplementTo",
+                    "relatedIdentifier": "10.1021/ic034699w",
+                    "relatedIdentifierType": "DOI"
+                }
+            ]
+        }
+    },
+    "title": "CCDC 222635: Experimental Crystal Structure Determination",
+    "release_type": "dataset",
+    "release_stage": "published",
+    "release_year": 2004,
+    "ext_ids": {
+        "doi": "10.5517/cc7gns3"
+    },
+    "publisher": "Cambridge Crystallographic Data Centre",
+    "language": "en",
+    "contribs": [
+        {
+            "index": 0,
+            "raw_name": "Stulz, E.",
+            "given_name": "E.",
+            "surname": "Stulz",
+            "role": "author"
+        },
+        {
+            "index": 1,
+            "raw_name": "Scott, S.M.",
+            "given_name": "S.M.",
+            "surname": "Scott",
+            "role": "author"
+        },
+        {
+            "index": 2,
+            "raw_name": "Ng, Yiu-Fai",
+            "given_name": "Yiu-Fai",
+            "surname": "Ng",
+            "role": "author"
+        },
+        {
+            "index": 3,
+            "raw_name": "Bond, A.D.",
+            "given_name": "A.D.",
+            "surname": "Bond",
+            "role": "author"
+        },
+        {
+            "index": 4,
+            "raw_name": "Teat, S.J.",
+            "given_name": "S.J.",
+            "surname": "Teat",
+            "role": "author"
+        },
+        {
+            "index": 5,
+            "raw_name": "Darling, S.L.",
+            "given_name": "S.L.",
+            "surname": "Darling",
+            "role": "author"
+        },
+        {
+            "index": 6,
+            "raw_name": "Feeder, N.",
+            "given_name": "N.",
+            "surname": "Feeder",
+            "role": "author"
+        },
+        {
+            "index": 7,
+            "raw_name": "Sanders, J.K.M.",
+            "given_name": "J.K.M.",
+            "surname": "Sanders",
+            "role": "author"
+        }
+    ],
+    "refs": [],
+    "abstracts": [
+        {
+            "content": "An entry from the Cambridge Structural Database, the world\u2019s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.",
+            "mimetype": "text/plain"
+        }
+    ]
+}
\ No newline at end of file