fix(tests): improve tests output

e2e/incompat_types_with_untyped_port/e2e_test.go

@@ -2,6 +2,7 @@ package test
 
 import (
 	"os/exec"
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -13,11 +14,27 @@ func Test(t *testing.T) {
 	out, err := cmd.CombinedOutput()
 	require.NoError(t, err)
 
-	require.Equal(
+	// TODO simplify when struct fields will have order: https://github.com/nevalang/neva/issues/698
+
+	expectedErrorPrefix := "main/main.neva:16:8 Incompatible types: in:in -> add: Subtype and supertype must both be either literals or instances, except if supertype is union: expression any, constraint {"
+	expectedErrorSuffix := "}\n"
+	expectedFields := []string{"data int", "idx int", "last bool"}
+
+	actualOutput := string(out)
+	require.True(
 		t,
-		"main/main.neva:16:8 Incompatible types: in:in -> add: Subtype and supertype must both be either literals or instances, except if supertype is union: expression any, constraint { data int, idx int, last bool }\n",
-		string(out),
+		strings.HasPrefix(actualOutput, expectedErrorPrefix),
+		"Error message should start with expected prefix",
 	)
+	require.True(
+		t,
+		strings.HasSuffix(actualOutput, expectedErrorSuffix),
+		"Error message should end with expected suffix")
+
+	// Check if all expected fields are present in the error message
+	for _, field := range expectedFields {
+		require.Contains(t, actualOutput, field, "Error message should contain field: "+field)
+	}
 
 	require.Equal(t, 0, cmd.ProcessState.ExitCode())
 }

examples/for_loop_over_list/e2e_test.go

@@ -1,6 +1,7 @@
 package test
 
 import (
+	"fmt"
 	"os"
 	"os/exec"
 	"testing"
@@ -21,12 +22,20 @@ func Test(t *testing.T) {
 	for i := 0; i < 100; i++ {
 		cmd := exec.Command("neva", "run", "for_loop_over_list")
 		out, err := cmd.CombinedOutput()
-		require.NoError(t, err)
+		if err != nil {
+			exitError, ok := err.(*exec.ExitError)
+			if ok {
+				t.Fatalf("Command failed with exit code %d. Error output:\n%s", exitError.ExitCode(), string(out))
+			} else {
+				t.Fatalf("Command failed with error: %v. Output:\n%s", err, string(out))
+			}
+		}
 		require.Equal(
 			t,
 			"1\n2\n3\n",
 			string(out),
+			fmt.Sprintf("Unexpected output on iteration %d", i),
 		)
-		require.Equal(t, 0, cmd.ProcessState.ExitCode())
+		require.Equal(t, 0, cmd.ProcessState.ExitCode(), fmt.Sprintf("Unexpected exit code on iteration %d", i))
 	}
 }

examples/select/e2e_test.go

@@ -1,6 +1,7 @@
 package test
 
 import (
+	"fmt"
 	"os"
 	"os/exec"
 	"testing"
@@ -19,13 +20,20 @@ func Test(t *testing.T) {
 	for i := 0; i < 100; i++ {
 		cmd := exec.Command("neva", "run", "select")
 		out, err := cmd.CombinedOutput()
-		require.NoError(t, err)
+		if err != nil {
+			exitError, ok := err.(*exec.ExitError)
+			if ok {
+				t.Fatalf("Command failed with exit code %d. Error output:\n%s", exitError.ExitCode(), string(out))
+			} else {
+				t.Fatalf("Command failed with error: %v. Output:\n%s", err, string(out))
+			}
+		}
 		require.Equal(
 			t,
 			"a\nb\nc\nd\n",
 			string(out),
 			"iteration %d failed\n", i,
 		)
-		require.Equal(t, 0, cmd.ProcessState.ExitCode())
+		require.Equal(t, 0, cmd.ProcessState.ExitCode(), fmt.Sprintf("Unexpected exit code on iteration %d", i))
 	}
 }