First let’s talk about the difference between a test plan and a test strategy. To me a test strategy is a set of ideas (not a document) to guide your testing. This is not a plan. A test plan is the set of ideas that guide your test project. A Test Plan is the sum of logistics (the set of ideas that guide your application of resources to fulfilling the test strategy) and the strategy. Michael Bolton wrote a blog post about this titled “What Should A Test Plan Contain?” almost 12 years ago.
What definition says that? I googled it and found several websites that made me sad. On those pages I read that a test strategy is a high level document. They talk about a strategy being generic requirements for testing or how to test on an organisational level. I am talking about something completely different here! Please remember what Rikard Edgren said in his fabulous tutorial "Test Strategy - Next Level. It is in the combination of WHAT and HOW you find the real strategy. If you separate the WHAT and the HOW, it becomes general and quite useless.