added caching utility

tests/test_cache.py

@@ -0,0 +1,59 @@
+from scgenerator.cache import Cache
+
+
+def test_io():
+    cache = Cache("Hello")
+    assert not cache.dir.exists()
+
+    cache.reset()
+    assert cache.dir.exists()
+
+    cache.save("a", "bonjour")
+    assert cache.load("a") == "bonjour"
+    assert "a" in cache
+
+    cache.delete()
+    assert not cache.dir.exists()
+
+
+def test_toml():
+    s1 = """
+    [config]
+    plot_range = [750, 1350]
+    rin_measurement = "./DualComb1GHz_updated_corrected_extrapolated_1GHz_noqn.csv"
+    num_segments = 31
+    num_frequencies = 513
+    noise_seed_start = 3012
+    anticorrelated_width = true
+    """
+    s2 = """
+    # some commment
+
+    [config]
+    anticorrelated_width = true
+    plot_range = [750,1350]
+    num_segments=31
+    num_frequencies = 513
+    noise_seed_start=3012
+    rin_measurement='./DualComb1GHz_updated_corrected_extrapolated_1GHz_noqn.csv'
+    """
+    s3 = """
+    # some commment
+
+    [config]
+    anticorrelated_width = true
+    plot_range = [750,1351]
+    num_segments=31
+    num_frequencies = 513
+    noise_seed_start=3012
+    rin_measurement='./DualComb1GHz_updated_corrected_extrapolated_1GHz_noqn.csv'
+    """
+
+    cache1 = Cache.from_toml(s1)
+    cache3 = Cache.from_toml(s3, create=False)
+    assert cache1.dir == Cache.from_toml(s2).dir
+    assert cache1.dir != cache3.dir
+    assert cache1.dir.exists()
+    cache1.delete()
+    assert not cache1.dir.exists()
+    assert not cache3.dir.exists()