Work on common provider interface to make adding new providers easier

client/client_test.go

@@ -0,0 +1,13 @@
+package client
+
+import "testing"
+
+func TestGetHttpClient(t *testing.T) {
+	if client != nil {
+		t.Error("client should've been nil since it hasn't been called a single time yet")
+	}
+	_ = GetHttpClient()
+	if client == nil {
+		t.Error("client shouldn't have been nil, since it has been called once")
+	}
+}