Added test for checking the extra_frames feature (issue #122).

Author: Nusiq

tests/data/test_animation_export/extra_frames.animation.json

@@ -0,0 +1,52 @@
+{
+	"format_version": "1.8.0",
+	"animations": {
+		"animation.extra_frames": {
+			"animation_length": 1.36,
+			"bones": {
+				"root": {
+					"position": {
+						"0": [0, 0, 0],
+						"0.04": [7.5, 12.5, 3.625],
+						"0.08": [24, 40, 13.667],
+						"0.12": [40.5, 67.5, 28.875],
+						"0.16": [48, 80, 48],
+						"0.2": [47.232, 74.88, 69.547],
+						"0.24": [43.776, 61.44, 91.04],
+						"0.28": [35.904, 42.56, 109.76],
+						"0.32": [21.888, 21.12, 122.987],
+						"0.36": {
+							"pre": [0, 0, 128],
+							"post": [0, 0, 128],
+							"lerp_mode": "catmullrom"
+						},
+						"0.56": {
+							"post": [-128, -65, 64],
+							"lerp_mode": "catmullrom"
+						},
+						"0.76": {
+							"post": [-112, -80, 0],
+							"lerp_mode": "catmullrom"
+						},
+						"0.8": [-100.352, -71.68, 0],
+						"0.84": [-84.096, -51.84, 0],
+						"0.88": [-62.464, -28.16, 0],
+						"0.92": [-34.688, -8.32, 0],
+						"0.96": [0, 0, 0],
+						"1": [41.216, 0, 0],
+						"1.04": [83.968, 0, 0],
+						"1.08": [122.112, 0, 0],
+						"1.12": [149.504, 0, 0],
+						"1.16": [160, 0, 0],
+						"1.2": [143.36, 0, 0],
+						"1.24": [103.68, 0, 0],
+						"1.28": [56.32, 0, 0],
+						"1.32": [16.64, 0, 0],
+						"1.36": [0, 0, 0]
+					}
+				}
+			},
+			"loop": true
+		}
+	}
+}

tests/data/tests_project.blend

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:b9180f3a069702de81403b875010339ee9a9118a5ab180ec6cf993f59101e496
-size 2466513
+oid sha256:64aff35894c58f33fe05eacb6401673ef2829f4bed3a0a77214a2e12bc844302
+size 2504729

tests/test_animation_export.py

@@ -53,7 +53,8 @@ def make_comparison_files(scene: str) -> tp.Tuple[tp.Dict, str]:
     'ArmatureAnimation_ArmatureOrigin',
 
     'animation_interpolation',
-    'animation_optimization'
+    'animation_optimization',
+    'extra_frames'
 ]
 
 def setup_module(module):