feat: implement health checks

tests/watchexec/health_spec.lua

@@ -0,0 +1,73 @@
+local health = require("watchexec.health")
+local stub = require("luassert.stub")
+
+describe("watchexec healthcheck", function()
+  local start_stub, ok_stub, error_stub
+  local has_stub, exec_stub
+
+  before_each(function()
+    start_stub = stub(vim.health, "start")
+    ok_stub = stub(vim.health, "ok")
+    error_stub = stub(vim.health, "error")
+  end)
+
+  after_each(function()
+    start_stub:revert()
+    ok_stub:revert()
+    error_stub:revert()
+
+    if has_stub then
+      has_stub:revert()
+    end
+
+    if exec_stub then
+      exec_stub:revert()
+    end
+  end)
+
+  it("reports all checks as OK when environment is valid", function()
+    has_stub = stub(vim.fn, "has", function()
+      return 1
+    end)
+    exec_stub = stub(vim.fn, "executable", function()
+      return 1
+    end)
+
+    health.check()
+
+    assert.stub(start_stub).was_called_with("watchexec.nvim diagnostics")
+    assert.stub(ok_stub).was_called(2)
+    assert.stub(error_stub).was_called(0)
+  end)
+
+  it("reports an error when watchexec is missing from PATH", function()
+    has_stub = stub(vim.fn, "has", function()
+      return 1
+    end)
+    exec_stub = stub(vim.fn, "executable", function()
+      return 0
+    end)
+
+    health.check()
+
+    assert.stub(ok_stub).was_called(1)
+    assert.stub(error_stub).was_called(1)
+
+    assert.stub(error_stub).was_called_with(
+      "Binary 'watchexec' was not found in PATH",
+      { "Install watchexec", "Or verify your plugin configuration if using a custom binary path." }
+    )
+  end)
+
+  it("reports an error when using an outdated Neovim version", function()
+    has_stub = stub(vim.fn, "has", function()
+      return 0
+    end)
+
+    health.check()
+
+    assert.stub(start_stub).was_called(0)
+    assert.stub(ok_stub).was_called(0)
+    assert.stub(error_stub).was_called(1)
+  end)
+end)

tests/watchexec/watchexec_spec.lua

@@ -1,17 +1,17 @@
 local plugin = require("watchexec")
 
 describe("watchexec logic", function()
-    before_each(function()
-        plugin.setup({
-            greeting = "Hello Test!"
-        })
-    end)
+  before_each(function()
+    plugin.setup({
+      greeting = "Hello Test!",
+    })
+  end)
 
-    it("can be required without errors", function()
-        assert.not_nil(plugin)
-    end)
+  it("can be required without errors", function()
+    assert.not_nil(plugin)
+  end)
 
-    it("correctly applies user configuration", function()
-        assert.equals("Hello Test!", plugin.config.greeting)
-    end)
+  it("correctly applies user configuration", function()
+    assert.equals("Hello Test!", plugin.config.greeting)
+  end)
 end)