fix: meshstats abstract_eval (#120)

#### Relevant issue or PR
n/a

#### Description of changes
Noticed that meshstats `abstract_eval` is wrong (crashes), so I fixed it
+ added a test.

#### Testing done
CI, new test

#### License

- [x] By submitting this pull request, I confirm that my contribution is
made under the terms of the [Apache 2.0
license](https://pasteurlabs.github.io/tesseract/LICENSE).
- [x] I sign the Developer Certificate of Origin below by adding my name
and email address to the `Signed-off-by` line.

<details>
<summary><b>Developer Certificate of Origin</b></summary>

```text
Developer Certificate of Origin
Version 1.1

Copyright (C) 2004, 2006 The Linux Foundation and its contributors.

Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.


Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
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    it.

(d) I understand and agree that this project and the contribution
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    personal information I submit with it, including my sign-off) is
    maintained indefinitely and may be redistributed consistent with
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```

</details>

Signed-off-by: Dion Häfner <dion.haefner@simulation.science>

Author: dionhaefner

examples/meshstats/tesseract_api.py

@@ -6,10 +6,11 @@
 
 from tesseract_core.runtime import Array, Differentiable, Float32, Int32, ShapeDType
 
-
 #
 # Schemas
 #
+
+
 class VolumetricMeshData(BaseModel):
     """Mock mesh schema; shapes not validated."""
 
@@ -25,12 +26,16 @@ class VolumetricMeshData(BaseModel):
 
     @model_validator(mode="after")
     def validate_num_points_per_cell(self):
+        if not isinstance(self.num_points_per_cell, np.ndarray):
+            return self
         if len(self.num_points_per_cell) != self.n_cells:
             raise ValueError(f"Length of num_points_per_cell must be {self.n_cells}")
         return self
 
     @model_validator(mode="after")
     def validate_cell_connectivity(self):
+        if not isinstance(self.cell_connectivity, np.ndarray):
+            return self
         expected_len = sum(self.num_points_per_cell)
         if len(self.cell_connectivity) != expected_len:
             raise ValueError(f"Length of cell_connectivity must be {expected_len}")
@@ -59,6 +64,8 @@ class OutputSchema(BaseModel):
 #
 # Required endpoints
 #
+
+
 def apply(inputs: InputSchema) -> OutputSchema:
     points = inputs.mesh.points
 
@@ -76,15 +83,15 @@ def apply(inputs: InputSchema) -> OutputSchema:
 
 
 def abstract_eval(abstract_inputs):
-    input_points_shapedtype = abstract_inputs["mesh"]["points"]
+    input_points_shapedtype = abstract_inputs.mesh.points
 
     # get dimension of vector space points live in from input
-    dim = input_points_shapedtype[1]
+    dim = input_points_shapedtype.shape[1]
     dtype = input_points_shapedtype.dtype
     return {
         "statistics": {
             "first_point_coordinates": ShapeDType(shape=(dim,), dtype=dtype),
-            "barycenter": ShapeDType(shape=(dim,), dtype="float"),
+            "barycenter": ShapeDType(shape=(dim,), dtype="float32"),
         }
     }
 

tests/endtoend_tests/test_examples.py

@@ -542,6 +542,50 @@ class Config:
                     np.array([0.0, 666.0, 0.0], dtype="float32"), as_json=True
                 ),
             ),
+            SampleRequest(
+                endpoint="abstract_eval",
+                payload={
+                    "inputs": {
+                        "mesh": {
+                            "n_points": 5,
+                            "n_cells": 8,
+                            "points": {
+                                "shape": [5, 3],
+                                "dtype": "float32",
+                            },
+                            "num_points_per_cell": {
+                                "shape": [2],
+                                "dtype": "int32",
+                            },
+                            "cell_connectivity": {
+                                "shape": [8],
+                                "dtype": "int32",
+                            },
+                            "cell_data": {
+                                "temperature": {
+                                    "shape": [2, 2],
+                                    "dtype": "float32",
+                                },
+                                "pressure": {
+                                    "shape": [2, 2],
+                                    "dtype": "float32",
+                                },
+                            },
+                            "point_data": {
+                                "displacement": {
+                                    "shape": [5, 3],
+                                    "dtype": "float32",
+                                },
+                                "velocity": {
+                                    "shape": [5, 3],
+                                    "dtype": "float32",
+                                },
+                            },
+                        }
+                    },
+                },
+                output_contains_pattern='"shape":[3],"dtype":"float32"',
+            ),
             SampleRequest(
                 endpoint="jacobian",
                 payload={