feat: stream and reconcile challenge dataset

internal/importer/importer_test.go

@@ -0,0 +1,44 @@
+package importer
+
+import (
+	"compress/gzip"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestValidateHeader(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		name    string
+		header  string
+		wantErr bool
+	}{
+		{name: "approved header", header: strings.Join(expectedHeader, ",")},
+		{name: "unknown column", header: "wrong", wantErr: true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			path := filepath.Join(t.TempDir(), "input.csv.gz")
+			file, err := os.Create(path)
+			if err != nil {
+				t.Fatal(err)
+			}
+			writer := gzip.NewWriter(file)
+			if _, err := writer.Write([]byte(tt.header + "\n")); err != nil {
+				t.Fatal(err)
+			}
+			if err := writer.Close(); err != nil {
+				t.Fatal(err)
+			}
+			if err := file.Close(); err != nil {
+				t.Fatal(err)
+			}
+			err = validateHeader(path)
+			if (err != nil) != tt.wantErr {
+				t.Fatalf("validateHeader() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}