diff --git a/test/BindingModels.cpp b/test/BindingModels.cpp
index 6a614c247..4869fee1e 100644
--- a/test/BindingModels.cpp
+++ b/test/BindingModels.cpp
@@ -1452,3 +1452,70 @@ CADET_BINDINGTEST("HIC_WATER_ON_HYDROPHOBIC_SURFACES", "EXT_HIC_WATER_ON_HYDROPH
 	)json", \
 	1e-10, 1e-10, CADET_NONBINDING_LIQUIDPHASE_COMP_UNUSED, CADET_COMPARE_BINDING_VS_NONBINDING)
 
+CADET_BINDINGTEST("HIC_CONSTANT_WATER_ACTIVITY", "EXT_HIC_CONSTANT_WATER_ACTIVITY", (0, 1,1), (1,0,1), (1.0, 2.0, 0.0, 0.0), (1.0, 3.0, 2.0, 0.0, 0.0), \
+	R"json( "HICCWA": [0.0, 1.14, 2.0],
+	        "HICCWA": [0.0, 0.004, 0.008],
+	        "HICCWA": 0.0184390384521496,
+	        "HICCWA": 0.000797098469630127,
+	        "HICCWA": [0.0, 0.004, 0.008],
+	        "HICCWA": [0.0, 4.88, 3.5]
+	)json", \
+	R"json( "HICCWA": [0.0, 1.14, 1.0, 2.0],
+	        "HICCWA": [0.0, 0.004, 2.0, 0.008],
+	        "HICCWA": 0.0184390384521496,
+	        "HICCWA": [0.0, 0.004, 0.008],
+	        "HICCWA": [0.0, 0.004, 0.008],
+	        "HICCWA": [0.0, 4.88, 3.0, 3.5]
+	)json", \
+	R"json( "EXT_HICCWA": [0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 1.14, 2.0],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.004, 0.008],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0],
+	        "EXT_HICCWA": 0.0,
+	        "EXT_HICCWA": 0.0184390384521496,
+	        "EXT_HICCWA": 0.0,
+	        "EXT_HICCWA": 0.0,
+	        "EXT_HICCWA": 0.0,
+	        "EXT_HICCWA": 0.000797098469630127,
+	        "EXT_HICCWA": 0.0,
+	        "EXT_HICCWA": 0.0,
+	        "EXT_HICCWA": [0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.004, 0.008],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 4.88, 3.5],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0]
+	)json", \
+	R"json( "EXT_HICCWA": [0.0, 0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 1.14, 1.0, 2.0],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.004, 2.0, 0.008],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0, 0.0],
+	        "EXT_HICCWA": 0.0,
+	        "EXT_HICCWA": 0.0184390384521496,
+	        "EXT_HICCWA": 0.0,
+	        "EXT_HICCWA": 0.0,
+	        "EXT_HICCWA": 0.0,
+	        "EXT_HICCWA": 0.000797098469630127,
+	        "EXT_HICCWA": 0.0,
+	        "EXT_HICCWA": 0.0,
+	        "EXT_HICCWA": [0.0, 0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.004, 2.0, 0.008],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 4.88, 3.0, 3.5],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0, 0.0],
+	        "EXT_HICCWA": [0.0, 0.0, 0.0, 0.0]
+	)json", \
+	1e-10, 1e-10, CADET_NONBINDING_LIQUIDPHASE_COMP_UNUSED, CADET_COMPARE_BINDING_VS_NONBINDING)
+