Add basic test for plot.py

Change-Id: I976dffaf7ca04b4403e29d6762aebd94afe86739
diff --git a/frc971/analysis/BUILD b/frc971/analysis/BUILD
index 82aca97..2686bcd 100644
--- a/frc971/analysis/BUILD
+++ b/frc971/analysis/BUILD
@@ -69,3 +69,13 @@
         "@matplotlib_repo//:matplotlib3",
     ],
 )
+
+py_test(
+    name = "plot_test",
+    srcs = ["plot_test.py"],
+    data = [
+        "@sample_logfile//file",
+    ],
+    restricted_to = ["//tools:k8"],
+    deps = [":plot"],
+)