diff --git a/tests/nac_state.json b/tests/nac_state.json
new file mode 100644
index 0000000000000000000000000000000000000000..cd86e4f5e811b284d181e61aa90dd86eb2d822ab
--- /dev/null
+++ b/tests/nac_state.json
@@ -0,0 +1,130 @@
+{
+    "m_boresight": [
+        0.0,
+        0.0,
+        1
+    ],
+    "m_ccdCenter": [
+        512.5,
+        512.5
+    ],
+    "m_currentParameterCovariance": [
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0,
+            0.0
+    ],
+    "m_currentParameterValue": [
+        1728181.03407928,
+        -2088202.59129735,
+        2082707.60899282,
+        2.25613869898165,
+        0.0943461617903765,
+        -0.963008015000929
+    ],
+    "m_ephemerisTime": 418855170.49265,
+    "m_focalLength": 549.23479652106,
+    "m_focalLengthEpsilon": 0.5,
+    "m_iTransL": [
+        0.0,
+        0.0,
+        71.42857143
+    ],
+    "m_iTransS": [
+        0.0,
+        71.42857143,
+        0.0
+    ],
+    "m_ifov": 25.44,
+    "m_instrumentID": "MDIS-NAC",
+    "m_line_pp": 0.0,
+    "m_majorAxis": 2439400,
+    "m_minorAxis": 2439400,
+    "m_nLines": 1024,
+    "m_nSamples": 1024,
+    "m_odtX": [
+        0.0,
+        1.0018542696238,
+        0.0,
+        0.0,
+        -0.000509444047494111,
+        0.0,
+        1.00401047146886e-05,
+        0.0,
+        1.00401047146886e-05,
+        0.0
+    ],
+    "m_odtY": [
+        0.0,
+        0.0,
+        1,
+        0.000906001059499675,
+        0.0,
+        0.000357484262662076,
+        0.0,
+        1.00401047146886e-05,
+        0.0,
+        1.00401047146886e-05
+    ],
+    "m_originalHalfLines": 512,
+    "m_originalHalfSamples": 512,
+    "m_pixelPitch": 0.014,
+    "m_sample_pp": 0.0,
+    "m_spacecraftName": "Messenger",
+    "m_spacecraftVelocity": [
+        0.0,
+        0.0,
+        0.0
+    ],
+    "m_startingDetectorLine": 1,
+    "m_startingDetectorSample": 9,
+    "m_sunPosition": [
+        -31648725087.5887,
+        -60633907522.7286,
+        -38729485.7733473
+    ],
+    "m_targetName": "Mercury",
+    "m_transX": [
+        0.0,
+        0.014,
+        0.0
+    ],
+    "m_transY": [
+        0.0,
+        0.0,
+        0.014
+    ],
+    "model_name": "ISIS_MDISNAC_USGSAstro_1_Linux64_csm30.so"
+}