feat: TA-Lib candlestick patterns — crows & three-line (part 1 of 9) (#130)

* feat: add Two Crows candlestick pattern (CDL2CROWS)

* feat: add Upside Gap Two Crows candlestick pattern (CDLUPSIDEGAP2CROWS)

* feat: add Identical Three Crows candlestick pattern (CDLIDENTICAL3CROWS)

* feat: add Three Line Strike candlestick pattern (CDL3LINESTRIKE)

* feat: add Three Stars in the South candlestick pattern (CDL3STARSINSOUTH)

bindings/python/tests/test_new_indicators.py

@@ -523,6 +523,26 @@ CANDLE_SCALAR = {
         lambda: ta.ThreeOutside(),
         lambda ind, h, l, c, v: ind.batch(c, h, l, c),
     ),
+    "TwoCrows": (
+        lambda: ta.TwoCrows(),
+        lambda ind, h, l, c, v: ind.batch(c, h, l, c),
+    ),
+    "UpsideGapTwoCrows": (
+        lambda: ta.UpsideGapTwoCrows(),
+        lambda ind, h, l, c, v: ind.batch(c, h, l, c),
+    ),
+    "IdenticalThreeCrows": (
+        lambda: ta.IdenticalThreeCrows(),
+        lambda ind, h, l, c, v: ind.batch(c, h, l, c),
+    ),
+    "ThreeLineStrike": (
+        lambda: ta.ThreeLineStrike(),
+        lambda ind, h, l, c, v: ind.batch(c, h, l, c),
+    ),
+    "ThreeStarsInSouth": (
+        lambda: ta.ThreeStarsInSouth(),
+        lambda ind, h, l, c, v: ind.batch(c, h, l, c),
+    ),
 }
 
 
@@ -1851,6 +1871,42 @@ def test_three_outside_reference():
     assert t.update((11.5, 13.0, 11.4, 12.5, 1.0, 2)) == pytest.approx(1.0)
 
 
+def test_two_crows_reference():
+    t = ta.TwoCrows()
+    assert t.update((10.0, 12.2, 9.9, 12.0, 1.0, 0)) == pytest.approx(0.0)
+    assert t.update((14.0, 14.2, 12.9, 13.0, 1.0, 1)) == pytest.approx(0.0)
+    assert t.update((13.5, 13.6, 10.9, 11.0, 1.0, 2)) == pytest.approx(-1.0)
+
+
+def test_upside_gap_two_crows_reference():
+    t = ta.UpsideGapTwoCrows()
+    assert t.update((10.0, 12.2, 9.9, 12.0, 1.0, 0)) == pytest.approx(0.0)
+    assert t.update((14.0, 14.2, 12.9, 13.0, 1.0, 1)) == pytest.approx(0.0)
+    assert t.update((15.0, 15.2, 12.4, 12.5, 1.0, 2)) == pytest.approx(-1.0)
+
+
+def test_identical_three_crows_reference():
+    t = ta.IdenticalThreeCrows()
+    assert t.update((13.0, 13.1, 11.9, 12.0, 1.0, 0)) == pytest.approx(0.0)
+    assert t.update((12.0, 12.1, 10.9, 11.0, 1.0, 1)) == pytest.approx(0.0)
+    assert t.update((11.0, 11.1, 9.9, 10.0, 1.0, 2)) == pytest.approx(-1.0)
+
+
+def test_three_line_strike_reference():
+    t = ta.ThreeLineStrike()
+    assert t.update((10.0, 11.1, 9.9, 11.0, 1.0, 0)) == pytest.approx(0.0)
+    assert t.update((10.5, 12.1, 10.4, 12.0, 1.0, 1)) == pytest.approx(0.0)
+    assert t.update((11.5, 13.1, 11.4, 13.0, 1.0, 2)) == pytest.approx(0.0)
+    assert t.update((13.5, 13.6, 9.4, 9.5, 1.0, 3)) == pytest.approx(1.0)
+
+
+def test_three_stars_in_south_reference():
+    t = ta.ThreeStarsInSouth()
+    assert t.update((20.0, 20.1, 8.0, 15.0, 1.0, 0)) == pytest.approx(0.0)
+    assert t.update((18.0, 18.1, 12.0, 16.0, 1.0, 1)) == pytest.approx(0.0)
+    assert t.update((15.0, 15.0, 14.0, 14.0, 1.0, 2)) == pytest.approx(1.0)
+
+
 # --- Lifecycle ------------------------------------------------------------