From 2caad1a474d9a1d8fa4e92497fa0e10787c79588 Mon Sep 17 00:00:00 2001
From: Erik Montnemery <erik@montnemery.com>
Date: Mon, 24 Jan 2022 22:57:56 +0100
Subject: [PATCH] Add support for converting to and from mmHg (#64844)

---
 homeassistant/util/pressure.py |  3 +++
 tests/util/test_pressure.py    | 31 +++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/homeassistant/util/pressure.py b/homeassistant/util/pressure.py
index 8ff3f9f5f93..dca94764de3 100644
--- a/homeassistant/util/pressure.py
+++ b/homeassistant/util/pressure.py
@@ -11,6 +11,7 @@ from homeassistant.const import (
     PRESSURE_INHG,
     PRESSURE_KPA,
     PRESSURE_MBAR,
+    PRESSURE_MMHG,
     PRESSURE_PA,
     PRESSURE_PSI,
     UNIT_NOT_RECOGNIZED_TEMPLATE,
@@ -25,6 +26,7 @@ VALID_UNITS: tuple[str, ...] = (
     PRESSURE_MBAR,
     PRESSURE_INHG,
     PRESSURE_PSI,
+    PRESSURE_MMHG,
 )
 
 UNIT_CONVERSION: dict[str, float] = {
@@ -36,6 +38,7 @@ UNIT_CONVERSION: dict[str, float] = {
     PRESSURE_MBAR: 1 / 100,
     PRESSURE_INHG: 1 / 3386.389,
     PRESSURE_PSI: 1 / 6894.757,
+    PRESSURE_MMHG: 1 / 133.322,
 }
 
 
diff --git a/tests/util/test_pressure.py b/tests/util/test_pressure.py
index 0109d045a55..e3b6ed92e4d 100644
--- a/tests/util/test_pressure.py
+++ b/tests/util/test_pressure.py
@@ -7,6 +7,7 @@ from homeassistant.const import (
     PRESSURE_INHG,
     PRESSURE_KPA,
     PRESSURE_MBAR,
+    PRESSURE_MMHG,
     PRESSURE_PA,
     PRESSURE_PSI,
 )
@@ -24,6 +25,7 @@ def test_convert_same_unit():
     assert pressure_util.convert(5, PRESSURE_INHG, PRESSURE_INHG) == 5
     assert pressure_util.convert(6, PRESSURE_KPA, PRESSURE_KPA) == 6
     assert pressure_util.convert(7, PRESSURE_CBAR, PRESSURE_CBAR) == 7
+    assert pressure_util.convert(8, PRESSURE_MMHG, PRESSURE_MMHG) == 8
 
 
 def test_convert_invalid_unit():
@@ -108,3 +110,32 @@ def test_convert_from_inhg():
     assert pressure_util.convert(inhg, PRESSURE_INHG, PRESSURE_CBAR) == pytest.approx(
         101.59167
     )
+    assert pressure_util.convert(inhg, PRESSURE_INHG, PRESSURE_MMHG) == pytest.approx(
+        762.002
+    )
+
+
+def test_convert_from_mmhg():
+    """Test conversion from mmHg to other units."""
+    inhg = 30
+    assert pressure_util.convert(inhg, PRESSURE_MMHG, PRESSURE_PSI) == pytest.approx(
+        0.580102
+    )
+    assert pressure_util.convert(inhg, PRESSURE_MMHG, PRESSURE_KPA) == pytest.approx(
+        3.99966
+    )
+    assert pressure_util.convert(inhg, PRESSURE_MMHG, PRESSURE_HPA) == pytest.approx(
+        39.9966
+    )
+    assert pressure_util.convert(inhg, PRESSURE_MMHG, PRESSURE_PA) == pytest.approx(
+        3999.66
+    )
+    assert pressure_util.convert(inhg, PRESSURE_MMHG, PRESSURE_MBAR) == pytest.approx(
+        39.9966
+    )
+    assert pressure_util.convert(inhg, PRESSURE_MMHG, PRESSURE_CBAR) == pytest.approx(
+        3.99966
+    )
+    assert pressure_util.convert(inhg, PRESSURE_MMHG, PRESSURE_INHG) == pytest.approx(
+        1.181099
+    )