How to Configure `go.testFlags` for Both Running and Debugging Unit Tests in VS Code?

Debugging Unit Tests with Flags in VS Code

When executing unit tests in Visual Studio Code (VS Code), it may be necessary to include additional flags. For instance, to resolve a specific error encountered during testing, the flag -ldflags "-X google.golang.org/protobuf/reflect/protoregistry.conflictPolicy=warn" must be supplied.

To set this flag within VS Code, the go.testFlags configuration in settings.json can be modified as follows:

<code class="json">"go.testFlags": [
    "-ldflags",
    "-X google.golang.org/protobuf/reflect/protoregistry.conflictPolicy=warn"
]</code>

However, using this configuration in conjunction with the Test Explorer or code lens functionality may still result in the error message panic: proto: extension number 1042 is already registered on message google.protobuf.FileOptions.

Distinction Between Run and Debug Test Configurations

By comparing the go.testFlags configurations for run and debug tests, it was discovered that the key difference lies in the formatting of the flag value. For run tests, the flag value should be enclosed in a single set of double quotes ("), while for debug tests, the flag value should be enclosed in single quotes (') and double quotes ("). This distinction is likely due to a limitation or requirement in the underlying debugging toolchain used by VS Code.

Recommended Configuration

To accommodate both run and debug test functionalities, it is recommended to define separate go.testFlags configurations for each scenario. For run tests, use the following configuration:

<code class="json">"go.testFlags": [
    "-ldflags",
    "-X google.golang.org/protobuf/reflect/protoregistry.conflictPolicy=warn"
]</code>

For debug tests, use the following configuration:

<code class="json">"go.testFlags": [
    "-ldflags",
    "'-X google.golang.org/protobuf/reflect/protoregistry.conflictPolicy=warn'"
]</code>

Additional Debugging Considerations

For more complex debugging scenarios, it may be necessary to utilize the dlv debugger. By compiling the test binary with additional flags, such as -gcflags="all=-N -l", and initiating a headless dlv session, it becomes possible to connect an editor to the debugging environment. For VS Code, this can be achieved by opening the launch.json file and configuring a debug configuration similar to the following:

<code class="json">{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Debug Test",
            "type": "go",
            "request": "attach",
            "mode": "remote",
            "port": 2345,
            "host": "127.0.0.1",
            "showLog": true,
            "trace": "log"
        }
    ]
}</code>

This configuration allows for seamless debugging via the debug panel in VS Code.

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