Add test WAVE files

.gitattributes

@@ -1 +1,7 @@
 * text=auto
+
+# Use Git LFS for binary files
+*.wav filter=lfs diff=lfs merge=lfs -text
+*.flac filter=lfs diff=lfs merge=lfs -text
+*.ogg filter=lfs diff=lfs merge=lfs -text
+*.mp3 filter=lfs diff=lfs merge=lfs -text

.github/workflows/ci.yml

@@ -31,6 +31,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
+        with:
+          lfs: true
       - name: Restore Boost from cache
         uses: actions/cache@v2
         id: cache-boost

rhubarb/tests/resources/README.adoc

@@ -0,0 +1,4 @@
+This directory contains test files for the WAVE file reader.
+
+All files starting with _sine-rect_ contain the same 10-second stereo signal sampled at 48,000 Hz. The left channel contains a 1 kHz sine wave, the right channel contains a 1 kHz triangle wave. As those signals are strictly periodic, Git can compress these files very efficiently.
+