diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..48c5ff3
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,87 @@
+"""
+This module contains shared fixtures for eo_tides tests.
+"""
+
+import odc.stac
+import pandas as pd
+import pystac_client
+import pytest
+
+GAUGE_X = 122.2183
+GAUGE_Y = -18.0008
+
+
+@pytest.fixture()
+def measured_tides_ds():
+    """
+    Load measured sea level data from the Broome ABSLMP tidal station:
+    http://www.bom.gov.au/oceanography/projects/abslmp/data/data.shtml
+    """
+    # Metadata for Broome ABSLMP tidal station:
+    # http://www.bom.gov.au/oceanography/projects/abslmp/data/data.shtml
+    ahd_offset = -5.322
+
+    # Load measured tides from ABSLMP tide gauge data
+    measured_tides_df = pd.read_csv(
+        "tests/data/IDO71013_2020.csv",
+        index_col=0,
+        parse_dates=True,
+        na_values=-9999,
+    )[["Sea Level"]]
+
+    # Update index and column names
+    measured_tides_df.index.name = "time"
+    measured_tides_df.columns = ["tide_height"]
+
+    # Apply station AHD offset
+    measured_tides_df += ahd_offset
+
+    # Return as xarray dataset
+    return measured_tides_df.to_xarray()
+
+
+# Create test data in different CRSs and resolutions
+@pytest.fixture(
+    params=[
+        ("EPSG:3577", 30),  # Australian Albers 30 m pixels
+        ("EPSG:4326", 0.00025),  # WGS84, 0.0025 degree pixels
+    ],
+    ids=["satellite_ds_epsg3577", "satellite_ds_epsg4326"],
+)
+def satellite_ds(request):
+    """
+    Load a sample timeseries of Landsat 8 data using odc-stac
+    """
+    # Obtain CRS and resolution params
+    crs, res = request.param
+
+    # Connect to stac catalogue
+    catalog = pystac_client.Client.open("https://explorer.dea.ga.gov.au/stac")
+
+    # Set cloud defaults
+    odc.stac.configure_rio(
+        cloud_defaults=True,
+        aws={"aws_unsigned": True},
+    )
+
+    # Build a query with the parameters above
+    bbox = [GAUGE_X - 0.08, GAUGE_Y - 0.08, GAUGE_X + 0.08, GAUGE_Y + 0.08]
+    query = catalog.search(
+        bbox=bbox,
+        collections=["ga_ls8c_ard_3"],
+        datetime="2020-01/2020-02",
+    )
+
+    # Search the STAC catalog for all items matching the query
+    ds = odc.stac.load(
+        list(query.items()),
+        bands=["nbart_red"],
+        crs=crs,
+        resolution=res,
+        groupby="solar_day",
+        bbox=bbox,
+        fail_on_error=False,
+        chunks={},
+    )
+
+    return ds