Move tests folder to top level for further refactoring

.github/workflows/codecov.yml

@@ -40,7 +40,7 @@ jobs:
           conda install --file requirements/test.txt
           conda install --file requirements/build.txt
           python -m pip install -r requirements/pip.txt
-          python -m pip install -e . --no-deps
+          python -m pip install . --no-deps
 
       - name: Validate diffpy.pdffit2
         run: |

.github/workflows/docs.yml

@@ -36,7 +36,7 @@ jobs:
           conda install --file requirements/run.txt
           conda install --file requirements/docs.txt
           python -m pip install -r requirements/pip.txt
-          python -m pip install -e . --no-deps
+          python -m pip install . --no-deps
 
       - name: build documents
         run: make -C doc html

.github/workflows/main.yml

@@ -37,7 +37,7 @@ jobs:
           conda install --file requirements/test.txt
           conda install --file requirements/build.txt
           python -m pip install -r requirements/pip.txt
-          python -m pip install -e . --no-deps
+          python -m pip install . --no-deps
 
       - name: Validate diffpy.pdffit2
         run: python -m pytest

.github/workflows/matrix.yml

@@ -42,7 +42,7 @@ jobs:
           conda install --file requirements/test.txt
           conda install --file requirements/build.txt
           python -m pip install -r requirements/pip.txt
-          python -m pip install -e . --no-deps
+          python -m pip install . --no-deps
 
       - name: Validate diffpy.pdffit2
         run: python -m pytest

tests/conftest.py

@@ -0,0 +1,50 @@
+import json
+from pathlib import Path
+
+import pytest
+import six
+
+import diffpy.pdffit2
+import diffpy.pdffit2.output  # assuming this is the correct import path
+
+
+@pytest.fixture
+def user_filesystem(tmp_path):
+    base_dir = Path(tmp_path)
+    home_dir = base_dir / "home_dir"
+    home_dir.mkdir(parents=True, exist_ok=True)
+    cwd_dir = base_dir / "cwd_dir"
+    cwd_dir.mkdir(parents=True, exist_ok=True)
+
+    home_config_data = {"username": "home_username", "email": "[email protected]"}
+    with open(home_dir / "diffpyconfig.json", "w") as f:
+        json.dump(home_config_data, f)
+
+    yield tmp_path
+
+
+@pytest.fixture
+def datafile():
+    """Fixture to dynamically load any test file."""
+
+    def _load(filename):
+        return "tests/testdata/" + filename
+
+    return _load
+
+
+@pytest.fixture
+def capture_output():
+    """Capture output from pdffit2 engine produced in function call."""
+
+    def _capture(f, *args, **kwargs):
+        savestdout = diffpy.pdffit2.output.stdout
+        fp = six.StringIO()
+        diffpy.pdffit2.redirect_stdout(fp)
+        try:
+            f(*args, **kwargs)
+        finally:
+            diffpy.pdffit2.redirect_stdout(savestdout)
+        return fp.getvalue()
+
+    return _capture