Define adapter interfaces and fake implementations

internal/adapters/analyzer/fake_test.go

@@ -0,0 +1,31 @@
+package analyzer
+
+import (
+	"context"
+	"errors"
+	"testing"
+)
+
+func TestFakeRunnerCapturesRequestAndReturnsPath(t *testing.T) {
+	fake := &FakeRunner{}
+	req := AnalyzeRequest{ArtifactType: "session-log", OutputPath: "artifacts/session-log.md"}
+
+	res, err := fake.Run(context.Background(), req)
+	if err != nil {
+		t.Fatalf("Run() error = %v", err)
+	}
+	if len(fake.Requests) != 1 || fake.Requests[0].ArtifactType != "session-log" {
+		t.Fatalf("requests = %#v, want captured request", fake.Requests)
+	}
+	if res.ArtifactPath != req.OutputPath {
+		t.Fatalf("artifact path = %q, want %q", res.ArtifactPath, req.OutputPath)
+	}
+}
+
+func TestFakeRunnerError(t *testing.T) {
+	fake := &FakeRunner{Err: errors.New("boom")}
+	_, err := fake.Run(context.Background(), AnalyzeRequest{})
+	if err == nil {
+		t.Fatal("expected error, got nil")
+	}
+}