[ENH] Test coverage for AEResNetNetwork Improved (#2518)

* _ae_resnet file added to improve test coverage

* Empty commit for CI

---------

Co-authored-by: MatthewMiddlehurst <25731235+MatthewMiddlehurst@users.noreply.github.com>

aeon/networks/tests/test_ae_resnet.py

@@ -0,0 +1,187 @@
+"""Tests for the AEResNetNetwork Model."""
+
+import pytest
+
+from aeon.networks import AEResNetNetwork
+from aeon.utils.validation._dependencies import _check_soft_dependencies
+
+
+@pytest.mark.skipif(
+    not _check_soft_dependencies(["tensorflow"], severity="none"),
+    reason="Tensorflow soft dependency unavailable.",
+)
+@pytest.mark.parametrize(
+    "latent_space_dim, n_residual_blocks, activation, n_filters",
+    [
+        (128, 3, "relu", 32),  # Test with relu activation
+        (256, 5, "sigmoid", 64),  # Test with sigmoid activation
+        (64, 2, "tanh", 16),  # Test with tanh activation
+    ],
+)
+def test_ae_res_unit_activation(
+    latent_space_dim, n_residual_blocks, activation, n_filters
+):
+    """Test whether AEResNetNetwork initializes correctly with different activations."""
+    aer = AEResNetNetwork(
+        latent_space_dim=latent_space_dim,
+        n_residual_blocks=n_residual_blocks,
+        activation=activation,
+        n_filters=n_filters,
+    )
+    encoder, decoder = aer.build_network((1000, 5))
+    assert encoder is not None
+    assert decoder is not None
+
+
+@pytest.mark.skipif(
+    not _check_soft_dependencies(["tensorflow"], severity="none"),
+    reason="Tensorflow soft dependency unavailable.",
+)
+@pytest.mark.parametrize(
+    "use_bias, n_conv_per_residual_block",
+    [
+        ([True, False, True], 3),  # list case
+        (True, 3),  # scalar broadcast case
+        pytest.param(
+            [True, False], 4, marks=pytest.mark.xfail(raises=ValueError)
+        ),  # error case
+    ],
+)
+def test_use_bias(use_bias, n_conv_per_residual_block):
+    """Test AEResNetNetwork use_bias configurations."""
+    aer = AEResNetNetwork(
+        latent_space_dim=128,
+        use_bias=use_bias,
+        n_conv_per_residual_block=n_conv_per_residual_block,
+    )
+    encoder, decoder = aer.build_network((1000, 5))
+    assert encoder is not None
+    assert decoder is not None
+
+
+@pytest.mark.skipif(
+    not _check_soft_dependencies(["tensorflow"], severity="none"),
+    reason="Tensorflow soft dependency unavailable.",
+)
+@pytest.mark.parametrize(
+    "n_filters, n_residual_blocks",
+    [
+        (64, 3),  # scalar case
+        ([64, 128, 256], 3),  # list case matching residual blocks
+        pytest.param(
+            [64, 128], 3, marks=pytest.mark.xfail(raises=ValueError)
+        ),  # error case
+    ],
+)
+def test_n_filters(n_filters, n_residual_blocks):
+    """Test AEResNetNetwork n_filters configurations."""
+    aer = AEResNetNetwork(
+        latent_space_dim=128,
+        n_filters=n_filters,
+        n_residual_blocks=n_residual_blocks,
+    )
+    encoder, decoder = aer.build_network((1000, 5))
+    assert encoder is not None
+    assert decoder is not None
+
+
+@pytest.mark.skipif(
+    not _check_soft_dependencies(["tensorflow"], severity="none"),
+    reason="Tensorflow soft dependency unavailable.",
+)
+@pytest.mark.parametrize(
+    "kernel_size, n_conv_per_residual_block",
+    [
+        (8, 3),  # scalar case
+        ([8, 5, 3], 3),  # list case matching conv layers
+        pytest.param(
+            [8, 5], 3, marks=pytest.mark.xfail(raises=ValueError)
+        ),  # error case
+    ],
+)
+def test_kernel_size(kernel_size, n_conv_per_residual_block):
+    """Test AEResNetNetwork kernel_size configurations."""
+    aer = AEResNetNetwork(
+        latent_space_dim=128,
+        kernel_size=kernel_size,
+        n_conv_per_residual_block=n_conv_per_residual_block,
+    )
+    encoder, decoder = aer.build_network((1000, 5))
+    assert encoder is not None
+    assert decoder is not None
+
+
+@pytest.mark.skipif(
+    not _check_soft_dependencies(["tensorflow"], severity="none"),
+    reason="Tensorflow soft dependency unavailable.",
+)
+@pytest.mark.parametrize(
+    "strides, n_conv_per_residual_block",
+    [
+        (1, 3),  # scalar case
+        pytest.param(
+            [1, 2], 3, marks=pytest.mark.xfail(raises=ValueError)
+        ),  # error case
+    ],
+)
+def test_strides(strides, n_conv_per_residual_block):
+    """Test AEResNetNetwork strides configurations."""
+    aer = AEResNetNetwork(
+        latent_space_dim=128,
+        strides=strides,
+        n_conv_per_residual_block=n_conv_per_residual_block,
+    )
+    encoder, decoder = aer.build_network((1000, 5))
+    assert encoder is not None
+    assert decoder is not None
+
+
+@pytest.mark.skipif(
+    not _check_soft_dependencies(["tensorflow"], severity="none"),
+    reason="Tensorflow soft dependency unavailable.",
+)
+@pytest.mark.parametrize(
+    "dilation_rate, n_conv_per_residual_block",
+    [
+        (1, 3),  # scalar case
+        pytest.param(
+            [1, 2], 3, marks=pytest.mark.xfail(raises=ValueError)
+        ),  # error case
+    ],
+)
+def test_dilation_rate(dilation_rate, n_conv_per_residual_block):
+    """Test AEResNetNetwork dilation_rate configurations."""
+    aer = AEResNetNetwork(
+        latent_space_dim=128,
+        dilation_rate=dilation_rate,
+        n_conv_per_residual_block=n_conv_per_residual_block,
+    )
+    encoder, decoder = aer.build_network((1000, 5))
+    assert encoder is not None
+    assert decoder is not None
+
+
+@pytest.mark.skipif(
+    not _check_soft_dependencies(["tensorflow"], severity="none"),
+    reason="Tensorflow soft dependency unavailable.",
+)
+@pytest.mark.parametrize(
+    "padding, n_conv_per_residual_block",
+    [
+        ("same", 3),  # scalar case
+        #    (['same', 'valid', 'same'], 3),  # list case matching conv layers
+        pytest.param(
+            ["same", "valid"], 3, marks=pytest.mark.xfail(raises=ValueError)
+        ),  # error case
+    ],
+)
+def test_padding(padding, n_conv_per_residual_block):
+    """Test AEResNetNetwork padding configurations."""
+    aer = AEResNetNetwork(
+        latent_space_dim=128,
+        padding=padding,
+        n_conv_per_residual_block=n_conv_per_residual_block,
+    )
+    encoder, decoder = aer.build_network((1000, 5))
+    assert encoder is not None
+    assert decoder is not None