diff --git a/docs/capabilities/comfyui.md b/docs/capabilities/comfyui.md
index 4e1c7d3b..bd915f1c 100644
--- a/docs/capabilities/comfyui.md
+++ b/docs/capabilities/comfyui.md
@@ -183,6 +183,11 @@ Para tunear nodo a nodo en vez del oneshot: `build_image_to_3d_workflow(image_na
   `import_workflow_json`/`import_workflow_png`, se resuelven sus dependencias con
   `resolve_workflow_deps` (instala nodos con `install_custom_node`, descubre modelos con
   `search_civitai_models`) y se validan con `validate_workflow` antes de encolar.
+- **Los 9 builders puros tienen tests de estructura** (`python/functions/ml/tests/test_comfyui_build_*.py`
+  + `test_comfyui_inject_lora.py`): verifican los `class_type` esperados, que los parámetros se reflejan
+  en los nodos, la validez de las conexiones `[node_id, output_index]` y la pureza de `inject_lora`. Son
+  tests offline (no tocan GPU ni server); las funciones impuras del grupo (todo lo que habla con el server,
+  el navegador o Civitai/HuggingFace) no se cubren con unit tests por diseño — se validan con el server vivo.
 - **Las funciones `*_ui` requieren la pestaña abierta y el navegador con CDP** (puerto 9222 por
   defecto). Sin target que matchee `server_url_substr`, devuelven `ok=False`. Para automatización
   desatendida sin navegador, usa el camino API (`submit_workflow` + `wait_result`).
diff --git a/python/functions/ml/comfyui_build_controlnet_workflow.md b/python/functions/ml/comfyui_build_controlnet_workflow.md
index a27de1ab..416b3125 100644
--- a/python/functions/ml/comfyui_build_controlnet_workflow.md
+++ b/python/functions/ml/comfyui_build_controlnet_workflow.md
@@ -38,9 +38,9 @@ params:
   - name: height
     desc: "Alto del latente/imagen en px (multiplo de 8). keyword-only."
 output: "dict en API format con node_ids como claves (CheckpointLoaderSimple '4', EmptyLatentImage '5', LoadImage '10', ControlNetLoader '12', CLIPTextEncode '6'/'7', ControlNetApply '13', KSampler '3', VAEDecode '8', SaveImage '9'). Listo para comfyui_submit_workflow."
-tested: false
-tests: []
-test_file_path: ""
+tested: true
+tests: ["usa ControlNetLoader+ControlNetApply", "control_image, modelo cn y strength reflejados"]
+test_file_path: "python/functions/ml/tests/test_comfyui_build_controlnet_workflow.py"
 file_path: "python/functions/ml/comfyui_build_controlnet_workflow.py"
 ---
 
diff --git a/python/functions/ml/comfyui_build_image_to_3d_workflow.md b/python/functions/ml/comfyui_build_image_to_3d_workflow.md
index a2f66029..d8c16823 100644
--- a/python/functions/ml/comfyui_build_image_to_3d_workflow.md
+++ b/python/functions/ml/comfyui_build_image_to_3d_workflow.md
@@ -40,9 +40,9 @@ params:
   - name: filename_prefix
     desc: "Prefijo del archivo de malla que SaveGLB escribe en output/ (ej. '3d_mesh' -> '3d_mesh_00001_.glb'). keyword-only."
 output: "dict en API format con node_ids '1'..'9' como claves; cada valor tiene class_type + inputs. Listo para comfyui_submit_workflow. El nodo '9' (SaveGLB) produce el archivo .glb en el output del servidor."
-tested: false
-tests: []
-test_file_path: ""
+tested: true
+tests: ["cadena de 9 nodos Hunyuan3D-2 nativos", "imagen, checkpoint, seed reflejados y SaveGLB presente"]
+test_file_path: "python/functions/ml/tests/test_comfyui_build_image_to_3d_workflow.py"
 file_path: "python/functions/ml/comfyui_build_image_to_3d_workflow.py"
 ---
 
diff --git a/python/functions/ml/comfyui_build_img2img_workflow.md b/python/functions/ml/comfyui_build_img2img_workflow.md
index d54bdd51..78a724f3 100644
--- a/python/functions/ml/comfyui_build_img2img_workflow.md
+++ b/python/functions/ml/comfyui_build_img2img_workflow.md
@@ -36,9 +36,9 @@ params:
   - name: scheduler
     desc: "Scheduler del sampler (ej. 'normal', 'karras'). keyword-only."
 output: "dict en API format con node_ids como claves (CheckpointLoaderSimple '4', LoadImage '10', VAEEncode '11', CLIPTextEncode '6'/'7', KSampler '3', VAEDecode '8', SaveImage '9'). Listo para comfyui_submit_workflow."
-tested: false
-tests: []
-test_file_path: ""
+tested: true
+tests: ["usa VAEEncode/LoadImage y no EmptyLatentImage", "denoise e init_image reflejados"]
+test_file_path: "python/functions/ml/tests/test_comfyui_build_img2img_workflow.py"
 file_path: "python/functions/ml/comfyui_build_img2img_workflow.py"
 ---
 
diff --git a/python/functions/ml/comfyui_build_inpaint_workflow.md b/python/functions/ml/comfyui_build_inpaint_workflow.md
index da2c1946..effc3b94 100644
--- a/python/functions/ml/comfyui_build_inpaint_workflow.md
+++ b/python/functions/ml/comfyui_build_inpaint_workflow.md
@@ -38,9 +38,9 @@ params:
   - name: scheduler
     desc: "Scheduler del sampler (ej. 'normal', 'karras'). keyword-only."
 output: "dict en API format con node_ids como claves (CheckpointLoaderSimple '4', LoadImage '10', LoadImageMask '12', VAEEncodeForInpaint '11', CLIPTextEncode '6'/'7', KSampler '3', VAEDecode '8', SaveImage '9'). Listo para comfyui_submit_workflow."
-tested: false
-tests: []
-test_file_path: ""
+tested: true
+tests: ["usa LoadImageMask+VAEEncodeForInpaint", "imagen base, mascara, seed y denoise reflejados"]
+test_file_path: "python/functions/ml/tests/test_comfyui_build_inpaint_workflow.py"
 file_path: "python/functions/ml/comfyui_build_inpaint_workflow.py"
 ---
 
diff --git a/python/functions/ml/comfyui_build_sdxl_refiner_workflow.md b/python/functions/ml/comfyui_build_sdxl_refiner_workflow.md
index 401441d1..7886d916 100644
--- a/python/functions/ml/comfyui_build_sdxl_refiner_workflow.md
+++ b/python/functions/ml/comfyui_build_sdxl_refiner_workflow.md
@@ -36,9 +36,9 @@ params:
   - name: height
     desc: "Alto del latente/imagen en px (SDXL nativo 1024). keyword-only."
 output: "dict en API format con node_ids como claves (CheckpointLoaderSimple base '4' y refiner '14', EmptyLatentImage '5', CLIPTextEncode base '6'/'7' y refiner '16'/'17', KSamplerAdvanced base '3' y refiner '15', VAEDecode '8', SaveImage '9'). Listo para comfyui_submit_workflow."
-tested: false
-tests: []
-test_file_path: ""
+tested: true
+tests: ["dos KSamplerAdvanced encadenados", "base emite ruido sobrante y refiner lo recoge (start/end_at_step compartidos)"]
+test_file_path: "python/functions/ml/tests/test_comfyui_build_sdxl_refiner_workflow.py"
 file_path: "python/functions/ml/comfyui_build_sdxl_refiner_workflow.py"
 ---
 
diff --git a/python/functions/ml/comfyui_build_txt2img_workflow.md b/python/functions/ml/comfyui_build_txt2img_workflow.md
index 48dc3247..7c2eb281 100644
--- a/python/functions/ml/comfyui_build_txt2img_workflow.md
+++ b/python/functions/ml/comfyui_build_txt2img_workflow.md
@@ -38,9 +38,9 @@ params:
   - name: filename_prefix
     desc: "Prefijo del PNG que SaveImage escribe en output/. keyword-only."
 output: "dict en API format con node_ids '3'..'9' como claves; cada valor tiene class_type + inputs. Listo para comfyui_submit_workflow."
-tested: false
-tests: []
-test_file_path: ""
+tested: true
+tests: ["class_types esperados (6 nodos)", "params seed/steps/cfg/width/height reflejados", "filename_prefix en SaveImage"]
+test_file_path: "python/functions/ml/tests/test_comfyui_build_txt2img_workflow.py"
 file_path: "python/functions/ml/comfyui_build_txt2img_workflow.py"
 ---
 
diff --git a/python/functions/ml/comfyui_build_upscale_workflow.md b/python/functions/ml/comfyui_build_upscale_workflow.md
index 6e4222b0..d9acad07 100644
--- a/python/functions/ml/comfyui_build_upscale_workflow.md
+++ b/python/functions/ml/comfyui_build_upscale_workflow.md
@@ -22,9 +22,9 @@ params:
   - name: method
     desc: "'model' (ESRGAN via UpscaleModelLoader + ImageUpscaleWithModel) o 'latent' (reescalado de pixel x2 con ImageScaleBy, sin modelo). keyword-only."
 output: "dict en API format. Con method='model': LoadImage '10' + UpscaleModelLoader '12' + ImageUpscaleWithModel '13' + SaveImage '9'. Con method='latent': LoadImage '10' + ImageScaleBy '13' + SaveImage '9'. Listo para comfyui_submit_workflow."
-tested: false
-tests: []
-test_file_path: ""
+tested: true
+tests: ["method='model' usa UpscaleModelLoader+ImageUpscaleWithModel", "method='latent' usa ImageScaleBy sin modelo"]
+test_file_path: "python/functions/ml/tests/test_comfyui_build_upscale_workflow.py"
 file_path: "python/functions/ml/comfyui_build_upscale_workflow.py"
 ---
 
diff --git a/python/functions/ml/comfyui_build_view_3d_workflow.md b/python/functions/ml/comfyui_build_view_3d_workflow.md
index cec51293..1e1512b9 100644
--- a/python/functions/ml/comfyui_build_view_3d_workflow.md
+++ b/python/functions/ml/comfyui_build_view_3d_workflow.md
@@ -24,9 +24,9 @@ params:
   - name: height
     desc: "Alto del viewport del nodo en px. keyword-only."
 output: "dict en API format con un unico nodo '1'. Con animation=False: class_type 'Load3D', inputs {model_file, image, width, height}. Con animation=True: class_type 'Load3DAdvanced', inputs {model_file, viewport_state, width, height}. Cargable con comfyui_load_workflow_ui (inyecta en la UI del navegador) o POSTeable a /prompt."
-tested: false
-tests: []
-test_file_path: ""
+tested: true
+tests: ["Load3D simple con model_file/width/height", "animation=True usa Load3DAdvanced"]
+test_file_path: "python/functions/ml/tests/test_comfyui_build_view_3d_workflow.py"
 file_path: "python/functions/ml/comfyui_build_view_3d_workflow.py"
 ---
 
diff --git a/python/functions/ml/comfyui_inject_lora.md b/python/functions/ml/comfyui_inject_lora.md
index 9c635a23..df98ec1c 100644
--- a/python/functions/ml/comfyui_inject_lora.md
+++ b/python/functions/ml/comfyui_inject_lora.md
@@ -28,9 +28,9 @@ params:
   - name: clip_node
     desc: "node_id cuya salida CLIP (slot 1) alimentara el LoRA. Si None, se detecta la fuente que hoy alimenta los CLIPTextEncode.clip. keyword-only."
 output: "copia del workflow con un nodo LoraLoader insertado (node_id = max id numerico + 1) y reconectado entre la fuente model/clip y sus consumidores."
-tested: false
-tests: []
-test_file_path: ""
+tested: true
+tests: ["no muta el dict de entrada (pureza)", "inserta LoraLoader con strength correcto", "reconecta KSampler.model al LoRA"]
+test_file_path: "python/functions/ml/tests/test_comfyui_inject_lora.py"
 file_path: "python/functions/ml/comfyui_inject_lora.py"
 ---
 
diff --git a/python/functions/ml/tests/_comfyui_wf_assert.py b/python/functions/ml/tests/_comfyui_wf_assert.py
new file mode 100644
index 00000000..7d92a848
--- /dev/null
+++ b/python/functions/ml/tests/_comfyui_wf_assert.py
@@ -0,0 +1,43 @@
+"""Helper compartido por los tests de los builders de workflow ComfyUI.
+
+Valida la invariante del "API format": un dict de nodos numerados, cada uno con
+`class_type` + `inputs`, donde las conexiones entre nodos son listas
+`[node_id, output_index]` que referencian un node_id existente.
+"""
+
+
+def assert_api_format(wf):
+    """Comprueba que `wf` es un workflow ComfyUI en API format bien formado.
+
+    - dict no vacio
+    - cada nodo tiene `class_type` (str) e `inputs` (dict)
+    - toda conexion `[node_id, output_index]` apunta a un nodo existente
+    """
+    assert isinstance(wf, dict) and wf, "workflow debe ser un dict no vacio"
+    ids = set(wf)
+    for nid, node in wf.items():
+        assert isinstance(node, dict), f"nodo {nid} no es dict"
+        assert isinstance(node.get("class_type"), str) and node["class_type"], (
+            f"nodo {nid} sin class_type"
+        )
+        assert isinstance(node.get("inputs"), dict), f"nodo {nid} sin inputs dict"
+        for key, val in node["inputs"].items():
+            if (
+                isinstance(val, list)
+                and len(val) == 2
+                and isinstance(val[0], str)
+                and isinstance(val[1], int)
+            ):
+                assert val[0] in ids, (
+                    f"nodo {nid}.{key} referencia node_id inexistente {val[0]!r}"
+                )
+
+
+def class_types(wf):
+    """Conjunto de los `class_type` presentes en el workflow."""
+    return {n["class_type"] for n in wf.values()}
+
+
+def node_by_ct(wf, ct):
+    """Primer nodo cuyo `class_type` es `ct` (lanza StopIteration si no hay)."""
+    return next(n for n in wf.values() if n["class_type"] == ct)
diff --git a/python/functions/ml/tests/test_comfyui_build_controlnet_workflow.py b/python/functions/ml/tests/test_comfyui_build_controlnet_workflow.py
new file mode 100644
index 00000000..e50c06cf
--- /dev/null
+++ b/python/functions/ml/tests/test_comfyui_build_controlnet_workflow.py
@@ -0,0 +1,30 @@
+"""Tests de estructura para comfyui_build_controlnet_workflow (funcion pura)."""
+
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(__file__))
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", ".."))
+
+from ml.comfyui_build_controlnet_workflow import comfyui_build_controlnet_workflow
+from _comfyui_wf_assert import assert_api_format, class_types, node_by_ct
+
+
+def test_estructura_controlnet():
+    wf = comfyui_build_controlnet_workflow("ck.safetensors", "ctrl.png", "cn.pth", "POS", "NEG")
+    assert_api_format(wf)
+    cts = class_types(wf)
+    assert "ControlNetLoader" in cts
+    assert "ControlNetApply" in cts
+
+
+def test_control_image_modelo_y_strength():
+    wf = comfyui_build_controlnet_workflow(
+        "ck.safetensors", "pose.png", "control_openpose.pth", "POS", "NEG", strength=0.65, seed=5
+    )
+    assert node_by_ct(wf, "ControlNetLoader")["inputs"]["control_net_name"] == "control_openpose.pth"
+    # La imagen de control se carga via LoadImage.
+    assert node_by_ct(wf, "LoadImage")["inputs"]["image"] == "pose.png"
+    apply_in = node_by_ct(wf, "ControlNetApply")["inputs"]
+    assert apply_in["strength"] == 0.65
+    assert node_by_ct(wf, "KSampler")["inputs"]["seed"] == 5
diff --git a/python/functions/ml/tests/test_comfyui_build_image_to_3d_workflow.py b/python/functions/ml/tests/test_comfyui_build_image_to_3d_workflow.py
new file mode 100644
index 00000000..6cf4867d
--- /dev/null
+++ b/python/functions/ml/tests/test_comfyui_build_image_to_3d_workflow.py
@@ -0,0 +1,42 @@
+"""Tests de estructura para comfyui_build_image_to_3d_workflow (funcion pura)."""
+
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(__file__))
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", ".."))
+
+from ml.comfyui_build_image_to_3d_workflow import comfyui_build_image_to_3d_workflow
+from _comfyui_wf_assert import assert_api_format, class_types, node_by_ct
+
+
+def test_cadena_hunyuan3d_nativa():
+    wf = comfyui_build_image_to_3d_workflow("obj.png")
+    assert_api_format(wf)
+    # Los 9 nodos nativos de Hunyuan3D-2 (sin custom node).
+    esperado = {
+        "LoadImage",
+        "ImageOnlyCheckpointLoader",
+        "CLIPVisionEncode",
+        "Hunyuan3Dv2Conditioning",
+        "EmptyLatentHunyuan3Dv2",
+        "KSampler",
+        "VAEDecodeHunyuan3D",
+        "VoxelToMeshBasic",
+        "SaveGLB",
+    }
+    assert class_types(wf) == esperado
+
+
+def test_imagen_checkpoint_y_salida_glb():
+    wf = comfyui_build_image_to_3d_workflow(
+        "robot.png", ckpt_name="hunyuan3d-dit-v2-mini.safetensors", seed=42
+    )
+    assert node_by_ct(wf, "LoadImage")["inputs"]["image"] == "robot.png"
+    assert (
+        node_by_ct(wf, "ImageOnlyCheckpointLoader")["inputs"]["ckpt_name"]
+        == "hunyuan3d-dit-v2-mini.safetensors"
+    )
+    assert node_by_ct(wf, "KSampler")["inputs"]["seed"] == 42
+    # SaveGLB es el nodo de salida: produce la malla .glb.
+    assert "SaveGLB" in class_types(wf)
diff --git a/python/functions/ml/tests/test_comfyui_build_img2img_workflow.py b/python/functions/ml/tests/test_comfyui_build_img2img_workflow.py
new file mode 100644
index 00000000..cff8f47e
--- /dev/null
+++ b/python/functions/ml/tests/test_comfyui_build_img2img_workflow.py
@@ -0,0 +1,30 @@
+"""Tests de estructura para comfyui_build_img2img_workflow (funcion pura)."""
+
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(__file__))
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", ".."))
+
+from ml.comfyui_build_img2img_workflow import comfyui_build_img2img_workflow
+from _comfyui_wf_assert import assert_api_format, class_types, node_by_ct
+
+
+def test_estructura_y_class_types():
+    wf = comfyui_build_img2img_workflow("ck.safetensors", "init.png", "POS", "NEG")
+    assert_api_format(wf)
+    # img2img usa VAEEncode (no EmptyLatentImage) para partir de la imagen base.
+    cts = class_types(wf)
+    assert "VAEEncode" in cts
+    assert "LoadImage" in cts
+    assert "EmptyLatentImage" not in cts
+
+
+def test_denoise_y_init_image():
+    wf = comfyui_build_img2img_workflow(
+        "ck.safetensors", "init.png", "POS", "NEG", denoise=0.45, seed=7
+    )
+    ks = node_by_ct(wf, "KSampler")["inputs"]
+    assert ks["denoise"] == 0.45
+    assert ks["seed"] == 7
+    assert node_by_ct(wf, "LoadImage")["inputs"]["image"] == "init.png"
diff --git a/python/functions/ml/tests/test_comfyui_build_inpaint_workflow.py b/python/functions/ml/tests/test_comfyui_build_inpaint_workflow.py
new file mode 100644
index 00000000..562bbf99
--- /dev/null
+++ b/python/functions/ml/tests/test_comfyui_build_inpaint_workflow.py
@@ -0,0 +1,31 @@
+"""Tests de estructura para comfyui_build_inpaint_workflow (funcion pura)."""
+
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(__file__))
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", ".."))
+
+from ml.comfyui_build_inpaint_workflow import comfyui_build_inpaint_workflow
+from _comfyui_wf_assert import assert_api_format, class_types, node_by_ct
+
+
+def test_estructura_inpaint():
+    wf = comfyui_build_inpaint_workflow("ck.safetensors", "img.png", "mask.png", "POS", "NEG")
+    assert_api_format(wf)
+    cts = class_types(wf)
+    # Inpaint necesita la mascara y la codificacion para inpaint.
+    assert "LoadImageMask" in cts
+    assert "VAEEncodeForInpaint" in cts
+
+
+def test_base_y_mascara_se_cargan():
+    wf = comfyui_build_inpaint_workflow(
+        "ck.safetensors", "base.png", "m.png", "POS", "NEG", seed=33, denoise=0.9
+    )
+    img = node_by_ct(wf, "LoadImage")["inputs"]["image"]
+    mask = node_by_ct(wf, "LoadImageMask")["inputs"]["image"]
+    assert img == "base.png"
+    assert mask == "m.png"
+    ks = node_by_ct(wf, "KSampler")["inputs"]
+    assert ks["seed"] == 33 and ks["denoise"] == 0.9
diff --git a/python/functions/ml/tests/test_comfyui_build_sdxl_refiner_workflow.py b/python/functions/ml/tests/test_comfyui_build_sdxl_refiner_workflow.py
new file mode 100644
index 00000000..58e0fd4a
--- /dev/null
+++ b/python/functions/ml/tests/test_comfyui_build_sdxl_refiner_workflow.py
@@ -0,0 +1,33 @@
+"""Tests de estructura para comfyui_build_sdxl_refiner_workflow (funcion pura)."""
+
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(__file__))
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", ".."))
+
+from ml.comfyui_build_sdxl_refiner_workflow import comfyui_build_sdxl_refiner_workflow
+from _comfyui_wf_assert import assert_api_format, class_types
+
+
+def test_dos_ksampler_advanced():
+    wf = comfyui_build_sdxl_refiner_workflow("base.st", "ref.st", "POS", "NEG")
+    assert_api_format(wf)
+    assert "KSamplerAdvanced" in class_types(wf)
+    ks = [n for n in wf.values() if n["class_type"] == "KSamplerAdvanced"]
+    assert len(ks) == 2
+
+
+def test_base_emite_ruido_sobrante_y_refiner_lo_recoge():
+    wf = comfyui_build_sdxl_refiner_workflow(
+        "base.st", "ref.st", "POS", "NEG", base_steps=20, refiner_steps=5, seed=9
+    )
+    ks = [n["inputs"] for n in wf.values() if n["class_type"] == "KSamplerAdvanced"]
+    base = next(k for k in ks if k["add_noise"] == "enable")
+    refiner = next(k for k in ks if k["add_noise"] == "disable")
+    # El base arranca el ruido y deja el sobrante; el refiner lo termina sin add_noise.
+    assert base["return_with_leftover_noise"] == "enable"
+    assert refiner["return_with_leftover_noise"] == "disable"
+    # Comparten el corte de pasos: el base termina donde declara base_steps.
+    assert base["end_at_step"] == 20
+    assert refiner["start_at_step"] == 20
diff --git a/python/functions/ml/tests/test_comfyui_build_txt2img_workflow.py b/python/functions/ml/tests/test_comfyui_build_txt2img_workflow.py
new file mode 100644
index 00000000..6c4657d3
--- /dev/null
+++ b/python/functions/ml/tests/test_comfyui_build_txt2img_workflow.py
@@ -0,0 +1,43 @@
+"""Tests de estructura para comfyui_build_txt2img_workflow (funcion pura)."""
+
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(__file__))
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", ".."))
+
+from ml.comfyui_build_txt2img_workflow import comfyui_build_txt2img_workflow
+from _comfyui_wf_assert import assert_api_format, class_types, node_by_ct
+
+
+def test_estructura_y_class_types():
+    wf = comfyui_build_txt2img_workflow("ck.safetensors", "POS", "NEG")
+    assert_api_format(wf)
+    assert class_types(wf) == {
+        "CheckpointLoaderSimple",
+        "CLIPTextEncode",
+        "EmptyLatentImage",
+        "KSampler",
+        "VAEDecode",
+        "SaveImage",
+    }
+
+
+def test_params_se_reflejan_en_los_nodos():
+    wf = comfyui_build_txt2img_workflow(
+        "ck.safetensors", "POS", "NEG", steps=8, cfg=6.0, width=640, height=480, seed=123
+    )
+    ks = node_by_ct(wf, "KSampler")["inputs"]
+    assert ks["seed"] == 123
+    assert ks["steps"] == 8
+    assert ks["cfg"] == 6.0
+    lat = node_by_ct(wf, "EmptyLatentImage")["inputs"]
+    assert lat["width"] == 640 and lat["height"] == 480
+    assert node_by_ct(wf, "CheckpointLoaderSimple")["inputs"]["ckpt_name"] == "ck.safetensors"
+    textos = sorted(n["inputs"]["text"] for n in wf.values() if n["class_type"] == "CLIPTextEncode")
+    assert textos == ["NEG", "POS"]
+
+
+def test_filename_prefix_en_saveimage():
+    wf = comfyui_build_txt2img_workflow("ck.safetensors", "POS", filename_prefix="demo_run")
+    assert node_by_ct(wf, "SaveImage")["inputs"]["filename_prefix"] == "demo_run"
diff --git a/python/functions/ml/tests/test_comfyui_build_upscale_workflow.py b/python/functions/ml/tests/test_comfyui_build_upscale_workflow.py
new file mode 100644
index 00000000..22c59ca1
--- /dev/null
+++ b/python/functions/ml/tests/test_comfyui_build_upscale_workflow.py
@@ -0,0 +1,28 @@
+"""Tests de estructura para comfyui_build_upscale_workflow (funcion pura)."""
+
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(__file__))
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", ".."))
+
+from ml.comfyui_build_upscale_workflow import comfyui_build_upscale_workflow
+from _comfyui_wf_assert import assert_api_format, class_types, node_by_ct
+
+
+def test_method_model_usa_esrgan():
+    wf = comfyui_build_upscale_workflow("img.png", model_name="4x-UltraSharp.pth", method="model")
+    assert_api_format(wf)
+    cts = class_types(wf)
+    assert "UpscaleModelLoader" in cts
+    assert "ImageUpscaleWithModel" in cts
+    assert node_by_ct(wf, "UpscaleModelLoader")["inputs"]["model_name"] == "4x-UltraSharp.pth"
+
+
+def test_method_latent_no_usa_modelo():
+    wf = comfyui_build_upscale_workflow("img.png", method="latent")
+    assert_api_format(wf)
+    cts = class_types(wf)
+    assert "ImageScaleBy" in cts
+    assert "UpscaleModelLoader" not in cts
+    assert node_by_ct(wf, "LoadImage")["inputs"]["image"] == "img.png"
diff --git a/python/functions/ml/tests/test_comfyui_build_view_3d_workflow.py b/python/functions/ml/tests/test_comfyui_build_view_3d_workflow.py
new file mode 100644
index 00000000..860cba20
--- /dev/null
+++ b/python/functions/ml/tests/test_comfyui_build_view_3d_workflow.py
@@ -0,0 +1,26 @@
+"""Tests de estructura para comfyui_build_view_3d_workflow (funcion pura)."""
+
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(__file__))
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", ".."))
+
+from ml.comfyui_build_view_3d_workflow import comfyui_build_view_3d_workflow
+from _comfyui_wf_assert import assert_api_format, class_types, node_by_ct
+
+
+def test_load3d_simple():
+    wf = comfyui_build_view_3d_workflow("mesh.glb", width=800, height=600)
+    assert_api_format(wf)
+    # Visor minimo: un unico nodo Load3D.
+    assert class_types(wf) == {"Load3D"}
+    n = node_by_ct(wf, "Load3D")["inputs"]
+    assert n["model_file"] == "mesh.glb"
+    assert n["width"] == 800 and n["height"] == 600
+
+
+def test_animation_usa_load3d_advanced():
+    wf = comfyui_build_view_3d_workflow("mesh.glb", animation=True)
+    assert class_types(wf) == {"Load3DAdvanced"}
+    assert node_by_ct(wf, "Load3DAdvanced")["inputs"]["model_file"] == "mesh.glb"
diff --git a/python/functions/ml/tests/test_comfyui_inject_lora.py b/python/functions/ml/tests/test_comfyui_inject_lora.py
new file mode 100644
index 00000000..497a63bf
--- /dev/null
+++ b/python/functions/ml/tests/test_comfyui_inject_lora.py
@@ -0,0 +1,45 @@
+"""Tests de estructura y pureza para comfyui_inject_lora (funcion pura)."""
+
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(__file__))
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", ".."))
+
+from ml.comfyui_build_txt2img_workflow import comfyui_build_txt2img_workflow
+from ml.comfyui_inject_lora import comfyui_inject_lora
+from _comfyui_wf_assert import assert_api_format, class_types
+
+
+def _lora_node_id(wf):
+    return next(nid for nid, n in wf.items() if n["class_type"] == "LoraLoader")
+
+
+def test_no_muta_la_entrada():
+    base = comfyui_build_txt2img_workflow("ck.safetensors", "POS", "NEG")
+    base_antes = {k: dict(v) for k, v in base.items()}
+    _ = comfyui_inject_lora(base, "style.safetensors")
+    # La copia profunda garantiza que el dict original queda intacto (pureza).
+    assert "LoraLoader" not in class_types(base)
+    assert set(base) == set(base_antes)
+
+
+def test_inserta_loraloader_y_respeta_strength():
+    base = comfyui_build_txt2img_workflow("ck.safetensors", "POS", "NEG")
+    inj = comfyui_inject_lora(base, "style.safetensors", strength_model=0.7, strength_clip=0.4)
+    assert_api_format(inj)
+    assert "LoraLoader" in class_types(inj)
+    lid = _lora_node_id(inj)
+    lora_in = inj[lid]["inputs"]
+    assert lora_in["lora_name"] == "style.safetensors"
+    assert lora_in["strength_model"] == 0.7
+    assert lora_in["strength_clip"] == 0.4
+
+
+def test_reconecta_el_ksampler_al_lora():
+    base = comfyui_build_txt2img_workflow("ck.safetensors", "POS", "NEG")
+    inj = comfyui_inject_lora(base, "style.safetensors")
+    lid = _lora_node_id(inj)
+    ks = next(n for n in inj.values() if n["class_type"] == "KSampler")
+    # El KSampler debe tomar el modelo del LoraLoader, no ya del checkpoint.
+    assert ks["inputs"]["model"][0] == lid