added RAG, Multiuser, TG bot

backend/tests/test_fitness_charts.py

@@ -0,0 +1,20 @@
+from datetime import date
+
+from app.fitness.charts import linear_regression, week_start
+
+
+def test_week_start_monday():
+    assert week_start(date(2026, 6, 13)) == date(2026, 6, 8)
+
+
+def test_linear_regression_increasing():
+    points = [(0.0, 1.0), (1.0, 2.0), (2.0, 3.0)]
+    fit = linear_regression(points)
+    assert fit is not None
+    assert abs(fit["slope"] - 1.0) < 1e-9
+    assert abs(fit["intercept"] - 1.0) < 1e-9
+
+
+def test_linear_regression_requires_two_points():
+    assert linear_regression([(0.0, 5.0)]) is None
+    assert linear_regression([]) is None