Expand Gotlin language and tooling

internal/lang/data_class_test.go

@@ -0,0 +1,72 @@
+package lang
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestGenerateGoDataClassUsesSnakeCaseJSONTags(t *testing.T) {
+	prog, err := Parse(`
+package demo
+
+data class KeycloakToken(var accessToken: String, var refreshToken: String)
+`)
+	if err != nil {
+		t.Fatalf("parse failed: %v", err)
+	}
+	out, err := GenerateGo(prog)
+	if err != nil {
+		t.Fatalf("generation failed: %v", err)
+	}
+	for _, want := range []string{"AccessToken", "`json:\"access_token\"`", "RefreshToken", "`json:\"refresh_token\"`"} {
+		if !strings.Contains(string(out), want) {
+			t.Fatalf("generated Go missing %q:\n%s", want, out)
+		}
+	}
+}
+
+func TestGenerateGoDataClassJSONNamingOverride(t *testing.T) {
+	prog, err := Parse(`
+package demo
+
+@jsonNaming(camelCase)
+data class Account(var availableBalance: Double)
+`)
+	if err != nil {
+		t.Fatalf("parse failed: %v", err)
+	}
+	out, err := GenerateGo(prog)
+	if err != nil {
+		t.Fatalf("generation failed: %v", err)
+	}
+	if !strings.Contains(string(out), "`json:\"availableBalance\"`") {
+		t.Fatalf("generated Go missing camelCase tag:\n%s", out)
+	}
+}
+
+func TestGenerateGoDataClassFieldVisibilityAndSelector(t *testing.T) {
+	prog, err := Parse(`
+package demo
+
+import json encoding.json
+
+data class Request(var email: String, private val traceId: String)
+
+fun email(body: ByteSlice): String {
+    val request = json.decode<Request>(body)
+    return request.email
+}
+`)
+	if err != nil {
+		t.Fatalf("parse failed: %v", err)
+	}
+	out, err := GenerateGo(prog)
+	if err != nil {
+		t.Fatalf("generation failed: %v", err)
+	}
+	for _, want := range []string{"Email", "`json:\"email\"`", "traceId string `json:\"-\"`", "return request.Email"} {
+		if !strings.Contains(string(out), want) {
+			t.Fatalf("generated Go missing %q:\n%s", want, out)
+		}
+	}
+}