add tests for new conditions of validation

tests/core/test_buffer.py

+"""Tests for sgnts.base.buffer module."""
+
+import numpy
+import pytest
+
+from sgnts.base import SeriesBuffer, TSFrame
+
+
+class TestTSFrame:
+    """Test group for TSFrame validation"""
+
+    def test_init(self):
+        """Test TSFrame initialization"""
+        b1 = SeriesBuffer(
+            offset=0, sample_rate=2048, data=numpy.random.rand(2048), shape=(2048,)
+        )
+        b2 = SeriesBuffer(
+            offset=b1.end_offset, sample_rate=2048, data=numpy.random.rand(2048)
+        )
+        frame = TSFrame(buffers=[b1, b2])
+        assert isinstance(frame, TSFrame)
+
+    def test_init_err_discontinuous(self):
+        """Test TSFrame initialization with error"""
+        b1 = SeriesBuffer(
+            offset=0, sample_rate=2048, data=numpy.random.rand(2048), shape=(2048,)
+        )
+        b2 = SeriesBuffer(
+            offset=2*b1.end_offset, sample_rate=2048, data=numpy.random.rand(2048)
+        )
+        with pytest.raises(ValueError):
+            TSFrame(buffers=[b1, b2])
+
+    def test_init_err_mixed_types(self):
+        """Test TSFrame initialization with error"""
+        b1 = SeriesBuffer(
+            offset=0, sample_rate=2048, data=None, shape=(2048,)
+        )
+        b2 = SeriesBuffer(
+            offset=2*b1.end_offset, sample_rate=2048, data=numpy.random.rand(2048)
+        )
+        with pytest.raises(ValueError):
+            TSFrame(buffers=[b1, b2])