Update tests with comments

test/runtests.jl

@@ -12,7 +12,7 @@ buffer = deepcopy(pixel_points)
 
 @testset "SwarmMakie.jl" begin
     @testset "Algorithms run without error" begin
-        for algorithm in [NoBeeswarm(), SimpleBeeswarm(), WilkinsonBeeswarm()]
+        for algorithm in [NoBeeswarm(), SimpleBeeswarm(), WilkinsonBeeswarm(), UniformJitter(), PseudorandomJitter(), QuasirandomJitter()]
             @test_nowarn begin
                 SwarmMakie.calculate!(buffer, algorithm, pixel_points, 10, :left)
             end
@@ -28,6 +28,11 @@ buffer = deepcopy(pixel_points)
             Makie.update_state_before_display!(f)
             Makie.update_state_before_display!(f)
             img = Makie.colorbuffer(f.scene; screen_config = CairoMakie.ScreenConfig(1, 1, :none, true, false))
+            # We have a matrix of all colors in the image.  Now, what we do is the following:
+            # The color white in RGBf is (1, 1, 1).  For a color to be red, the blue and green components
+            # must correspondingly decrease, since the RGBf values cannot exceed 1.
+            # So, we know if a red pixel with alpha=0.5 is rendered, the blue value there will be between 0.6 and 0.4.
+            # If more than one marker is rendered, the red is more intense and the blue value will be even less than 4.
             nonwhite_pixels = 0
             overlap_pixels = 0
             for pixel in img
@@ -38,18 +43,21 @@ buffer = deepcopy(pixel_points)
                     overlap_pixels += 1
                 end
             end
-            @test overlap_pixels/nonwhite_pixels < 0.07 # 7% overlap should be our ideal for this sort of data
+            @test overlap_pixels/nonwhite_pixels < 0.07 # 7% overlap should be our ideal for this sort of data - this is totally arbitrary.
         end
     end
     @testset "Gutters" begin
+        # First, we test the regular gutter with multiple categories.
         f, a, p = beeswarm(rand(1:3, 300), randn(300); color = rand(RGBAf, 300), markersize = 20, algorithm = SimpleBeeswarm())
         Makie.update_state_before_display!(f)        
         Makie.update_state_before_display!(f)
         @test_warn "Gutter threshold exceeded" p.gutter = 0.5
+        # Next, we test it in direction y
         f, a, p = beeswarm(rand(1:3, 300), randn(300); direction = :x, color = rand(RGBAf, 300), markersize = 20, algorithm = SimpleBeeswarm())
         Makie.update_state_before_display!(f)        
         Makie.update_state_before_display!(f)
         @test_warn "Gutter threshold exceeded" p.gutter = 0.5
+        # and it shouldn't warn if, when using a lower markersize, the gutter is not reached.
         f, a, p = beeswarm(rand(1:3, 300), randn(300); direction = :y, color = rand(RGBAf, 300), markersize = 9, algorithm = SimpleBeeswarm())
         Makie.update_state_before_display!(f)        
         Makie.update_state_before_display!(f)
@@ -58,5 +66,5 @@ buffer = deepcopy(pixel_points)
 end
 
 # TODO: 
-# - Test gutters when added
 # - Test that the order of points is preserved
+# How to do this?  Test y values for SimpleBeeswarm and use StatsBase.histogram to test WilkinsonBeeswarm.  Jitter should just make sure y coordinates are preserved.