Add Tests for Prober Package

[aryasoni98]

Problem

The prober package has 0% test coverage and needs comprehensive testing.

Current State

• ❌ prober package: 0% test coverage
• No tests for Interface implementation
• No tests for Func wrapper
• No tests for Go function
• No tests for authorization handling
• No tests for error handling

Acceptance Criteria

• Interface implementation tested
• Func wrapper tested
• Go function tested with various scenarios
• Authorization handling tested
• Error handling tested
• Test coverage >80%

Tasks

Core Interface Testing

• Test Interface implementation

  func TestInterface(t *testing.T) {
      // Test that Interface can be implemented
      var _ prober.Interface = &mockProber{}
  }

• Test Func wrapper

  func TestFunc(t *testing.T) {
      called := false
      fn := prober.Func(func(ctx context.Context) error {
          called = true
          return nil
      })
      
      err := fn.Probe(context.Background())
      assert.NoError(t, err)
      assert.True(t, called)
  }

Go Function Testing

• Test Go function with valid authorization
• Test Go function with invalid authorization
• Test Go function with missing authorization
• Test Go function with probe errors
• Test Go function with different ports

Authorization Testing

• Test valid authorization header
• Test invalid authorization header
• Test missing authorization header
• Test authorization environment variable

Error Handling Testing

• Test probe function returning errors
• Test HTTP server errors
• Test context cancellation
• Test timeout scenarios

Test Files to Create

• pkg/prober/prober_test.go

Success Metrics

• Target: >80% test coverage
• Current: 0%
• Measurement: go test -coverprofile=coverage.out ./pkg/prober/...