Add string marker tests

Author: abcsds

test/Project.toml

@@ -1,3 +1,4 @@
 [deps]
 Downloads = "f43a241f-c20a-4ad4-852c-f6b1247861c6"
+SHA = "ea8e919c-243c-51af-8825-aaa63cd721ce"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"

test/runtests.jl

@@ -1,4 +1,4 @@
-using XDF, Downloads, Test
+using XDF, Downloads, Test, SHA
 
 @testset "Minimal XDF file" begin
     url = "https://github.com/xdf-modules/example-files/blob/master/minimal.xdf?raw=true"
@@ -74,3 +74,37 @@ end
     @test d_stream["segments"][1] == (1, 12875)
     @test d_stream["segments"][2] == (12876, 27815)
 end
+
+@testset "strings" begin
+    file = "test/testdata/test_chunk3.xdf"
+    @testset "strings.sha256" begin
+        open(file) do f 
+            @test bytes2hex(sha256(f)) == "c730991efa078906117aa2accdca5f0ea11c54f43c3884770eba21e5a72edb82"
+        end
+    end
+    @testset "strings.read_xdf" begin
+        import XDF
+        streams = XDF.read_xdf(file)
+    end
+    @testset "strings.dejitter" begin
+        import XDF
+        streams = XDF.read_xdf(file)
+        s1 = streams[3735928559]
+        @test s1["type"] == "Marker"
+        @test s1["nchannels"] == 2
+        @test s1["srate"] == 1000.0
+        @test s1["dtype"] == String
+        @test size(s1["data"]) == (1, 2)
+        @test s1["data"] == ["Marker 0A" "Marker 0A"]
+        s2 = streams[46202862]
+        @test s2["type"] == "EEG"
+        @test s2["nchannels"] == 64
+        @test s2["srate"] == 1000.0
+        @test s2["dtype"] == Float64
+        @test size(s2["data"]) == (1, 64)
+        @test sum(s2["data"]) == 0.0
+        sgs = [XDF.dejitter(streams[k])["segments"] for k in keys(streams)]
+        @test sgs[1] == [(1, 1)]
+        @test sgs[2] == [(1, 1)]
+    end
+end