Add LevelFilter test

command/agent/log_levels_test.go

@@ -0,0 +1,27 @@
+package agent
+
+import (
+	"testing"
+
+	"github.com/hashicorp/logutils"
+)
+
+func TestLevelFilter(t *testing.T) {
+
+	filt := LevelFilter()
+	filt.Levels = []logutils.LogLevel{"TRACE", "DEBUG", "INFO", "WARN", "ERR"}
+	level := logutils.LogLevel("INFO")
+
+	// LevelFilter regards INFO as valid level
+	if !ValidateLevelFilter(level, filt) {
+		t.Fatalf("expected valid LogLevel, %s was invalid", level)
+	}
+
+	level = logutils.LogLevel("FOO")
+
+	// LevelFilter regards FOO as invalid level
+	if ValidateLevelFilter(level, filt) {
+		t.Fatalf("expected invalid LogLevel, %s was valid", level)
+	}
+
+}