refactor(all): add test file

data/reports/heatmap/heatmap_style1.json

+[
+  {
+    "x": [
+      "A",
+      "B",
+      "C",
+      "D",
+      "E"
+    ],
+    "y": [
+      "W",
+      "X",
+      "Y",
+      "Z"
+    ],
+    "colorscale": [
+      [
+        0,
+        "#3D9970"
+      ],
+      [
+        1,
+        "#001f3f"
+      ]
+    ],
+    "showscale": false
+  }
+]
\ No newline at end of file