[FILE:LINE] ISSUE_TITLE
Severity: Critical | Major | Minor | Informational
Description of the issue and why it matters.

// BAD - repetitive
func TestAdd(t *testing.T) {
    if Add(1, 2) != 3 {
        t.Error("wrong")
    }
    if Add(0, 0) != 0 {
        t.Error("wrong")
    }
}

// GOOD
func TestAdd(t *testing.T) {
    tests := []struct {
        name     string
        a, b     int
        want     int
    }{
        {"positive numbers", 1, 2, 3},
        {"zeros", 0, 0, 0},
        {"negative", -1, 1, 0},
    }

    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            got := Add(tt.a, tt.b)
            if got != tt.want {
                t.Errorf("Add(%d, %d) = %d, want %d", tt.a, tt.b, got, tt.want)
            }
        })
    }
}

// BAD
if got != want {
    t.Error("wrong result")
}

// GOOD
if got != want {
    t.Errorf("GetUser(%d) = %v, want %v", id, got, want)
}

// For complex types
if diff := cmp.Diff(want, got); diff != "" {
    t.Errorf("GetUser() mismatch (-want +got):\n%s", diff)
}

func TestFoo(t *testing.T) {
    tests := []struct{...}

    for _, tt := range tests {
        tt := tt  // capture (not needed Go 1.22+)
        t.Run(tt.name, func(t *testing.T) {
            t.Parallel()
            // test code
        })
    }
}

// BAD - manual cleanup, skipped on failure
func TestWithTempFile(t *testing.T) {
    f, _ := os.CreateTemp("", "test")
    defer os.Remove(f.Name())  // skipped if test panics
}

// GOOD
func TestWithTempFile(t *testing.T) {
    f, _ := os.CreateTemp("", "test")
    t.Cleanup(func() {
        os.Remove(f.Name())
    })
}

func BenchmarkProcess(b *testing.B) {
    data := generateTestData(1000)
    b.ResetTimer()

    for i := 0; i < b.N; i++ {
        Process(data)
    }
}

// Run: go test -bench=BenchmarkProcess -benchmem

func FuzzParseInput(f *testing.F) {
    // Seed corpus
    f.Add(`{"name": "test"}`)
    f.Add(``)
    f.Add(`{invalid}`)

    f.Fuzz(func(t *testing.T, input string) {
        result, err := ParseInput(input)
        if err != nil {
            return // invalid input is expected
        }
        // If parsing succeeded, re-encoding should work
        if _, err := json.Marshal(result); err != nil {
            t.Errorf("Marshal after Parse: %v", err)
        }
    })
}

// Run: go test -fuzz=FuzzParseInput -fuzztime=30s

func TestHandler(t *testing.T) {
    srv := NewServer(mockDeps)

    req := httptest.NewRequest("GET", "/api/users/123", nil)
    w := httptest.NewRecorder()

    srv.ServeHTTP(w, req)

    if w.Code != http.StatusOK {
        t.Errorf("status = %d, want %d", w.Code, http.StatusOK)
    }
}

var update = flag.Bool("update", false, "update golden files")

func TestRender(t *testing.T) {
    got := Render(input)
    golden := filepath.Join("testdata", t.Name()+".golden")

    if *update {
        if err := os.WriteFile(golden, got, 0644); err != nil {
            t.Fatalf("writing golden file: %v", err)
        }
    }

    want, err := os.ReadFile(golden)
    if err != nil {
        t.Fatalf("reading golden file: %v (run with -update to create)", err)
    }
    if !bytes.Equal(got, want) {
        t.Errorf("output mismatch:\ngot:\n%s\nwant:\n%s", got, want)
    }
}

// BAD - tests private state
func TestUser(t *testing.T) {
    u := NewUser("alice")
    if u.id != 1 {  // testing internal field
        t.Error("wrong id")
    }
}

// GOOD - tests behavior
func TestUser(t *testing.T) {
    u := NewUser("alice")
    if u.ID() != 1 {
        t.Error("wrong ID")
    }
}

// BAD - tests interfere with each other
var testDB = setupDB()

func TestA(t *testing.T) {
    t.Parallel()
    testDB.Insert(...)  // race!
}

// GOOD - isolated per test
func TestA(t *testing.T) {
    db := setupTestDB(t)
    t.Cleanup(func() { db.Close() })
    db.Insert(...)
}

// BAD
assert.Equal(t, want, got)  // "expected X got Y" - which test?

// GOOD
assert.Equal(t, want, got, "user name after update")