02 Dec 2025

Vscode Go debug breakpoint doesn't work

Problem

When clicking debug the test above a go test func, the breakpoint doesn’t work.

Starting: ~/go/bin/dlv dap --check-go-version=false --listen=127.0.0.1:44285 --log-dest=3 from ./apis/core/v1
DAP server listening at: 127.0.0.1:44285
Type 'dlv help' for list of commands.
got kubeconfig: ~/.kube/kubeconfig.ly
PASS
Process 582447 has exited with status 0
Detaching

Solution

Run dlv directly

dlvtest() {
    TEST_NAME="$1"

    if [ -z "$TEST_NAME" ]; then
        echo "Usage: dlv_test <TestFunctionName>"
        return 1
    fi

    echo "🔍 Searching for package containing $TEST_NAME..."

    # 1. Find the file defining the test function (recursive grep)
    # We search for "func TestName" to avoid finding calls to the function.
    MATCHING_FILE=$(grep -r -l "func $TEST_NAME" . | head -n 1)

    if [ -z "$MATCHING_FILE" ]; then
        echo "❌ Error: Could not find definition for 'func $TEST_NAME' in current directory."
        return 1
    fi

    # 2. Get the directory (package path)
    PKG_DIR=$(dirname "$MATCHING_FILE")
    echo "✅ Found in: $PKG_DIR"

    # 3. Run dlv test
    # -gcflags="all=-N -l" is added implicitly by 'dlv test', ensuring breakpoints work.
    echo "🚀 Starting dlv debugger on :2345..."
    
    dlv test "$PKG_DIR" \
      --listen=:2345 \
      --headless \
      --api-version=2 \
      -- \
      -test.v \
      -test.run "^$TEST_NAME$"
}

Vscode config add an entry

{
    "version": "0.2.0",
    "configurations": [
       {
            "name": "Connect to server",
            "type": "go",
            "request": "attach",
            "mode": "remote",
            "remotePath": "${workspaceFolder}",
            "port": 2345,
            "host": "127.0.0.1"
        }
    ]
}

Test it works

Add breakpoint now, it should be working now.