ctr: Add a test file to test cpu getCpuVariant

Change-Id: Id9558de2e41b08c41cf7d4b458774e99e24515a0
Signed-off-by: Wei Chen <Wei.Chen@arm.com>
Signed-off-by: Penny Zheng <Penny.Zheng@arm.com>

platforms/cpuinfo_test.go

@@ -0,0 +1,24 @@
+package platforms
+
+import (
+	"runtime"
+	"testing"
+)
+
+func TestCPUVariant(t *testing.T) {
+	if !isArmArch(runtime.GOARCH) || !isLinuxOS(runtime.GOOS) {
+		t.Skip("only relevant on linux/arm")
+	}
+
+	variants := []string{"v8", "v7", "v6", "v5", "v4", "v3"}
+
+	p := getCPUVariant()
+	for _, variant := range variants {
+		if p == variant {
+			t.Logf("got valid variant as expected: %#v = %#v\n", p, variant)
+			return
+		}
+	}
+
+	t.Fatalf("could not get valid variant as expected: %v\n", variants)
+}