Add new test mocks

Author: adamreeve

test/image/baselines/sankey_align_center.png

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+{
+    "data": [
+        {
+            "type": "sankey",
+            "node": {
+                "label": ["0", "1", "2", "3", "4", "5"],
+                "align": "center"
+            },
+            "link": {
+                "source": [
+                    0, 1, 4, 2, 1
+                ],
+                "target": [
+                    1, 4, 5, 4, 3
+                ],
+                "value": [
+                    4, 2, 3, 1, 2
+                ]
+            }
+        }],
+    "layout": {
+        "title": {"text": "Sankey with center aligned nodes"},
+        "width": 800,
+        "height": 800
+    }
+}

test/image/baselines/sankey_align_justify.png

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+{
+    "data": [
+        {
+            "type": "sankey",
+            "node": {
+                "label": ["0", "1", "2", "3", "4", "5"],
+                "align": "justify"
+            },
+            "link": {
+                "source": [
+                    0, 1, 4, 2, 1
+                ],
+                "target": [
+                    1, 4, 5, 4, 3
+                ],
+                "value": [
+                    4, 2, 3, 1, 2
+                ]
+            }
+        }],
+    "layout": {
+        "title": {"text": "Sankey with justified node alignment"},
+        "width": 800,
+        "height": 800
+    }
+}

test/image/baselines/sankey_align_left.png

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+{
+    "data": [
+        {
+            "type": "sankey",
+            "node": {
+                "label": ["0", "1", "2", "3", "4", "5"],
+                "align": "left"
+            },
+            "link": {
+                "source": [
+                    0, 1, 4, 2, 1
+                ],
+                "target": [
+                    1, 4, 5, 4, 3
+                ],
+                "value": [
+                    4, 2, 3, 1, 2
+                ]
+            }
+        }],
+    "layout": {
+        "title": {"text": "Sankey with left aligned nodes"},
+        "width": 800,
+        "height": 800
+    }
+}

test/image/baselines/sankey_align_right.png

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+{
+    "data": [
+        {
+            "type": "sankey",
+            "node": {
+                "label": ["0", "1", "2", "3", "4", "5"],
+                "align": "right"
+            },
+            "link": {
+                "source": [
+                    0, 1, 4, 2, 1
+                ],
+                "target": [
+                    1, 4, 5, 4, 3
+                ],
+                "value": [
+                    4, 2, 3, 1, 2
+                ]
+            }
+        }],
+    "layout": {
+        "title": {"text": "Sankey with right aligned nodes"},
+        "width": 800,
+        "height": 800
+    }
+}