Add output validation against a defined JSON schema

internal/builtin/postprocess_test.go

@@ -0,0 +1,60 @@
+package builtin
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"gitea.maximumdirect.net/eric/seriatim/internal/config"
+	"gitea.maximumdirect.net/eric/seriatim/internal/model"
+)
+
+func TestValidateOutputSucceedsAfterAssignIDs(t *testing.T) {
+	merged := model.MergedTranscript{
+		Segments: []model.Segment{
+			{Source: "input.json", Speaker: "Alice", Start: 1, End: 2, Text: "hello"},
+			{Source: "input.json", Speaker: "Alice", Start: 3, End: 4, Text: "again"},
+		},
+	}
+
+	withIDs, _, err := assignIDs{}.Process(context.Background(), merged, testConfig())
+	if err != nil {
+		t.Fatalf("assign IDs: %v", err)
+	}
+	got, events, err := validateOutput{}.Process(context.Background(), withIDs, testConfig())
+	if err != nil {
+		t.Fatalf("validate output: %v", err)
+	}
+	if len(got.Segments) != 2 {
+		t.Fatalf("segment count = %d, want 2", len(got.Segments))
+	}
+	if len(events) != 1 || !strings.Contains(events[0].Message, "validated 2 output segment(s)") {
+		t.Fatalf("events = %#v", events)
+	}
+}
+
+func TestValidateOutputFailsBeforeAssignIDs(t *testing.T) {
+	merged := model.MergedTranscript{
+		Segments: []model.Segment{
+			{Source: "input.json", Speaker: "Alice", Start: 1, End: 2, Text: "hello"},
+		},
+	}
+
+	_, _, err := validateOutput{}.Process(context.Background(), merged, testConfig())
+	if err == nil {
+		t.Fatal("expected validation error")
+	}
+	if !strings.Contains(err.Error(), "segment 0 has id 0; want 1") {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func testConfig() config.Config {
+	return config.Config{
+		InputReader:           config.DefaultInputReader,
+		InputFiles:            []string{"input.json"},
+		PreprocessingModules:  []string{"validate-raw", "normalize-speakers", "trim-text"},
+		PostprocessingModules: []string{"assign-ids", "validate-output"},
+		OutputModules:         []string{"json"},
+	}
+}