add first test

ReferenceTests/src/tests/float32_conversion.jl

@@ -0,0 +1,24 @@
+# Tests for plots relying on Float32Convert
+# - values outside -3.4e38 .. 3.4e38 (floatmax)
+# - value ranges ⪅ 1e-7 * values
+# - currently only applies to Axis
+# - need to test primitives and everything using project
+
+@reference_test "Sub-Float32 eps" begin
+    fig = Figure()
+    ax = Axis(fig[1, 1])
+    xlims!(ax, 0, 12)
+    ax.xticks[] = (0:12, string.(0:12))
+    ax.yticks[] = (1e9 .+ (0:11), ["1e9 + $i" for i in 0:11])
+
+    # scatter + lines
+    scatterlines!(1:10, 1e9 .+ (1:10))
+    linesegments!(2:11, 1e9 .+ (1:10))
+
+    image!(ax, 0..3, (1e9+7)..(1e9+10), [1 2; 3 4])
+    heatmap!(ax, 9..12, (1e9+1)..(1e9+4), [1 2; 3 4])
+
+    mesh!(ax, Circle(Point2(6, 1e9 + 6), 1.0), color = :red)
+
+    fig
+end