Add Go testing commands

src/golang.md

@@ -59,3 +59,19 @@ go work use ./example
 # Generate a TLS/SSL cert. Get GOPATH from `go env`.
 go run 'C:\Program Files\Go\src\crypto\tls\generate_cert.go' --rsa-bits=2048 --host=localhost
 ```
+
+## Testing
+```powershell
+# Get basic test coverage, per file.
+go test -cover ./...
+
+# Generate a coverage report by method and function.
+go test -coverprofile='profile.out' ./...
+# Read the report and output to the command line.
+go tool cover -func='profile.out'
+# Read the report and output to HTML.
+go tool cover -func='profile.out'
+# Generate a coverage report with number of times each statement is executed during testing.
+# Use -covermode=atomic if running any tests in parallel.
+go test -covermode=count -coverprofile='profile.out' ./...
+```