Update evidence context output coverage

internal/modules/generic/output/json/encoder_test.go

@@ -353,8 +353,8 @@ func TestEncodeIncludesValidatedEvidenceContext(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Decode(evidence context file) error = %v", err)
 	}
-	if len(value.Contexts) != 0 {
-		t.Fatalf("evidence context = %#v, want explicit empty contexts", value)
+	if len(value) != 1 || value[0].ID != 7 || value[0].Text != "Source content retained only in the evidence artifact." {
+		t.Fatalf("evidence context = %#v, want the published source-unit array", value)
 	}
 	index := decodeObject(t, fileBytes(t, result.Files, "index.json"))
 	if got, want := index["evidence_context"], map[string]any{
@@ -786,7 +786,8 @@ func acceptedEvidenceContextArtifact(t *testing.T) contracts.SerializedArtifact
 	}
 	document.Digest = digest
 	artifact, err := evidencecontext.Serialize(evidencecontext.BuildRequest{
-		Source: document, WindowUnits: 3, SelectedLanes: []string{"spells"},
+		Source: document, WindowUnits: 3,
+		SourceRefs: []source.SourceRef{{SourceID: "source-1", StartUnitID: 7, EndUnitID: 7}},
 	})
 	if err != nil {
 		t.Fatal(err)