diff --git a/.github/workflows/ci_run_tests.yml b/.github/workflows/ci_run_tests.yml
new file mode 100644
index 0000000..f5468dd
--- /dev/null
+++ b/.github/workflows/ci_run_tests.yml
@@ -0,0 +1,50 @@
+name: test
+
+on:
+  push:
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+#    name: test (Python ${{ matrix.python-version }}, ${{ matrix.os }})
+    name: test (env file ${{ matrix.environment-files }}, ${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ "ubuntu-latest"]
+#        python-version: [ "3.10" , "3.11" ]
+        environment-files: ["environment-3.9.yml", "environment-3.9-pinned.yml", "environment-3.10.yml", "environment-3.11.yml", "environment-3.10-pinned.yml", "environment-3.10-astropy.yml"]
+      fail-fast: false
+    env:
+      PYTHONUNBUFFERED: 1
+    defaults:
+      run:
+        shell: micromamba-shell {0}
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: mamba-org/setup-micromamba@v1
+        with:
+#          environment-name: pystrometry-${{ runner.os }}-py${{ matrix.python-version }}
+          environment-name: pystrometry-${{ runner.os }}-${{ matrix.environment-files }}
+          environment-file: ${{ matrix.environment-files }}
+#          create-args: >-
+#            python=${{ matrix.python-version }}
+          init-shell: none
+          generate-run-shell: true
+
+#      - run: pip install -e .[test] pytest-xdist
+
+      - run: pip list
+      - run: pip install pytest
+
+      - run: micromamba env export
+
+#      - run: python -c "import pystrometry; print('Version ' + pystrometry.__version__); print('Path ' + pystrometry.__path__[0])"
+
+      - run: pytest --durations=0 -vs -o log_cli=true --log-level=INFO pystrometry/tests
+      - run: pytest --durations=0 -vs -o log_cli=true --log-level=INFO pystrometry/utils/tests
\ No newline at end of file
diff --git a/.github/workflows/python-package-conda.yml b/.github/workflows/python-package-conda.yml
deleted file mode 100644
index 5d0df30..0000000
--- a/.github/workflows/python-package-conda.yml
+++ /dev/null
@@ -1,94 +0,0 @@
-name: Python Package using Conda
-
-on: [push]
-
-jobs:
-  build-linux-python-3p10:
-      runs-on: ubuntu-latest
-      strategy:
-        max-parallel: 5
-
-      steps:
-      - uses: actions/checkout@v4
-      - name: Set up Python 3.10
-        uses: actions/setup-python@v3
-        with:
-          python-version: '3.10'
-      - name: Add conda to system path
-        run: |
-          echo $CONDA/bin >> $GITHUB_PATH
-      - name: Install dependencies
-        run: |
-          conda env update --file environment-3.10.yml --name base
-      - name: Lint with flake8
-        run: |
-          conda install flake8
-          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
-        continue-on-error: true
-      - name: Test with pytest
-        run: |
-          conda config --set solver classic
-          conda install pytest
-          pytest pystrometry/tests 
-          pytest pystrometry/utils/tests 
-
-  build-linux-python-3p10-pinned:
-      runs-on: ubuntu-latest
-      strategy:
-        max-parallel: 5
-
-      steps:
-      - uses: actions/checkout@v4
-      - name: Set up Python 3.10
-        uses: actions/setup-python@v3
-        with:
-          python-version: '3.10'
-      - name: Add conda to system path
-        run: |
-          echo $CONDA/bin >> $GITHUB_PATH
-      - name: Install dependencies
-        run: |
-          conda env update --file environment-3.10-pinned.yml --name base
-      - name: Lint with flake8
-        run: |
-          conda install flake8
-          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
-        continue-on-error: true
-      - name: Test with pytest
-        run: |
-          conda config --set solver classic
-          conda install pytest
-          pytest pystrometry/tests 
-          pytest pystrometry/utils/tests 
-
-  build-linux-python-3p9:
-      runs-on: ubuntu-latest
-      strategy:
-        max-parallel: 5
-
-      steps:
-      - uses: actions/checkout@v4
-      - name: Set up Python 3.9
-        uses: actions/setup-python@v3
-        with:
-          python-version: '3.9'
-      - name: Add conda to system path
-        run: |
-          echo $CONDA/bin >> $GITHUB_PATH
-      - name: Install dependencies
-        run: |
-          conda env update --file environment-3.9.yml --name base
-      - name: Lint with flake8
-        run: |
-          conda install flake8
-          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
-        continue-on-error: true
-      - name: Test with pytest
-        run: |
-          conda install pytest
-          pytest pystrometry/tests          
-          pytest pystrometry/utils/tests 
-
diff --git a/environment-3.10-astropy.yml b/environment-3.10-astropy.yml
new file mode 100644
index 0000000..93f6c52
--- /dev/null
+++ b/environment-3.10-astropy.yml
@@ -0,0 +1,18 @@
+name: pystrometry-environment-3p10-astropy
+channels:
+  - conda-forge
+dependencies:
+  - python == 3.10
+  - numpy
+  - pip
+  - kepmodel
+  - pandas
+  - pyarrow
+  - matplotlib
+  - astroquery
+  - astropy == 6.0
+  - sympy
+  - scipy
+  - uncertainties
+  - pip:
+    - linearfit
diff --git a/pystrometry/pystrometry.py b/pystrometry/pystrometry.py
index aedd017..8e7a628 100644
--- a/pystrometry/pystrometry.py
+++ b/pystrometry/pystrometry.py
@@ -4857,6 +4857,11 @@ def get_ephemeris(center='g@399', target='0', start_time=None, stop_time=None, s
         with open(out_file, 'wb') as ephemeris:
             ephemeris.write(content)
 
+    logging.info(f"Reading {horizons_file_seed} from {ephemeris_dir}")
+    files = os.listdir(ephemeris_dir)
+    for file in files:
+        logging.info(f"File in ephemeris_dir: {file}")
+
     xyzdata = read_ephemeris(horizons_file_seed, overwrite=overwrite, ephemeris_path=ephemeris_dir)
     return xyzdata
 
diff --git a/pystrometry/tests/test_get_ephemeris.py b/pystrometry/tests/test_get_ephemeris.py
new file mode 100644
index 0000000..5ea6176
--- /dev/null
+++ b/pystrometry/tests/test_get_ephemeris.py
@@ -0,0 +1,33 @@
+import logging
+import os
+
+from astropy.table import Table
+from astropy.time import Time
+
+from ..pystrometry import get_ephemeris
+from ..pystrometry import ephemeris_dir
+
+logging.basicConfig(level=logging.INFO)
+
+def test_get_ephemeris_valid_input():
+    # Define valid test inputs
+    center = 'g@399'
+    target = '0'
+    start_time = Time('2023-01-01T00:00:00')
+    stop_time = Time('2024-01-10T00:00:00')
+    step_size = '1d'
+
+    logging.info(f"\nephemeris_dir={ephemeris_dir}\n")
+    horizons_file_seed = '{}_{}_{}_{}_{}'.format(center, target, start_time, stop_time, step_size)
+    out_file = os.path.join(ephemeris_dir, horizons_file_seed + '.txt')
+
+    # Call the function
+    result = get_ephemeris(center=center, target=target, start_time=start_time, stop_time=stop_time, step_size=step_size)
+    assert os.path.isfile(out_file), f"Expected output file {out_file} does not exist."
+
+    # Validate the result
+    assert isinstance(result, Table), "Result should be an Astropy Table"
+    assert len(result) > 0, "Result table should not be empty"
+    assert 'X' in result.colnames, "Result table should contain 'X' column"
+    assert 'Y' in result.colnames, "Result table should contain 'Y' column"
+    assert 'Z' in result.colnames, "Result table should contain 'Z' column"