added unit tests

Author: cwittens

test/test_unit.jl

@@ -94,6 +94,26 @@ end
     @test_nowarn display(boundary_conditions)
 end
 
+@testitem "KdVEquation1D" setup=[Setup] begin
+    equations = @test_nowarn @inferred KdVEquation1D(gravity = 1.0)
+    @test_nowarn print(equations)
+    @test_nowarn display(equations)
+    conversion_functions = [
+        waterheight_total,
+        waterheight
+    ]
+    for conversion in conversion_functions
+        @test DispersiveShallowWater.varnames(conversion, equations) isa Tuple
+    end
+    q = [42.0]
+    @test isapprox(@inferred(cons2prim(prim2cons(q, equations), equations)), q)
+    @test @inferred(prim2prim(q, equations)) == q
+    @test @inferred(waterheight_total(q, equations)) == 42.0
+    @test @inferred(waterheight(q, equations)) == 43.0
+    @test @inferred(still_water_surface(q, equations)) == 0.0
+    @test @inferred(prim2phys(q, equations)) == @inferred(prim2prim(q, equations))
+end
+
 @testitem "BBMEquation1D" setup=[Setup] begin
     equations = @test_nowarn @inferred BBMEquation1D(gravity = 1.0)
     @test_nowarn print(equations)