Move renderer tests to captured templates

docs/roadmap/implementation.md

@@ -185,6 +185,12 @@ are deliberately migrated in Stage 6 rather than accommodated in production.
 
 ## Stage 6: Move Renderer Tests Onto Captured Templates
 
+**Completed:** Renderer fixtures and benchmarks now compile captured templates
+before rendering; invalid syntax, missing captures, cancellation, session, and
+artifact behavior remain covered. Go 1.27.3 `go test ./internal/prompt
+./internal/configuration ./internal/usecase` passed, resolving the deferred
+repository and renderer checks.
+
 **Finding:** 3. **Scope:** prompt rendering tests/benchmarks and their use-case/configuration callers.
 
 1. Use `CompileTemplate` and a small `TemplateLookup` fixture, or a loaded

internal/configuration/targets_test.go

@@ -75,7 +75,7 @@ func TestRequestCompletesLoadedPartialProfile(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	runner := usecase.NewRunner(state, state, nil, prompt.NewGoRenderer(), nil, nil, nil)
+	runner := usecase.NewRunner(state, state, nil, prompt.NewCompiledRenderer(state), nil, nil, nil)
 	prepared, err := runner.Prepare(context.Background(), domain.RunRequest{
 		PromptID: "example", ProfileID: "partial",
 		Execution: &domain.ExecutionTargetOverride{Endpoint: "https://example.invalid/v1", Model: "request-model"},

internal/prompt/renderer_test.go

@@ -14,7 +14,6 @@ import (
 )
 
 func TestGoRenderer_Render(t *testing.T) {
-	renderer := NewGoRenderer()
 	ctx := context.Background()
 
 	inputs := map[string]*domain.Artifact{
@@ -33,7 +32,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		res, err := renderer.Render(ctx, def, inputs, vars)
+		res, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, vars)
 		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
@@ -53,7 +52,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		res, err := renderer.Render(ctx, def, inputs, vars)
+		res, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, vars)
 		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
@@ -71,7 +70,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		res, err := renderer.Render(ctx, def, inputs, vars)
+		res, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, vars)
 		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
@@ -99,7 +98,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		res, err := renderer.Render(ctx, def, inputs, vars)
+		res, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, vars)
 		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
@@ -129,7 +128,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		res, err := renderer.Render(ctx, def, inputs, vars)
+		res, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, vars)
 		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
@@ -151,7 +150,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		res, err := renderer.Render(ctx, def, inputs, vars)
+		res, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, vars)
 		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
@@ -169,7 +168,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		res, err := renderer.Render(ctx, def, inputs, map[string]string{
+		res, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, map[string]string{
 			"tone":       "concise",
 			"session_id": "agent-session-123",
 		})
@@ -190,7 +189,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		res, err := renderer.Render(ctx, def, inputs, vars)
+		res, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, vars)
 		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
@@ -208,7 +207,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		_, err := renderer.Render(ctx, def, inputs, vars)
+		_, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, vars)
 		if !errors.Is(err, ErrRenderFailure) {
 			t.Fatalf("expected ErrRenderFailure, got %v", err)
 		}
@@ -223,7 +222,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		_, err := renderer.Render(ctx, def, inputs, map[string]string{
+		_, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, map[string]string{
 			"tone":       "concise",
 			"session_id": strings.Repeat("x", domain.SessionIDMaxLength+1),
 		})
@@ -241,7 +240,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		_, err := renderer.Render(ctx, def, inputs, map[string]string{
+		_, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, map[string]string{
 			"tone":       "concise",
 			"session_id": "session" + string([]byte{0xff}),
 		})
@@ -258,7 +257,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		res, err := renderer.Render(ctx, def, inputs, vars)
+		res, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, vars)
 		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
@@ -278,7 +277,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		res, err := renderer.Render(ctx, def, inputs, vars)
+		res, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, vars)
 		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
@@ -298,7 +297,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		_, err := renderer.Render(ctx, def, inputs, vars)
+		_, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, vars)
 		if !errors.Is(err, ErrRenderFailure) {
 			t.Fatalf("expected ErrRenderFailure, got %v", err)
 		}
@@ -315,7 +314,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		_, err := renderer.Render(ctx, def, map[string]*domain.Artifact{}, vars)
+		_, err := capturedTestRenderer(t, def).Render(ctx, def, map[string]*domain.Artifact{}, vars)
 		if !errors.Is(err, ErrMissingRequiredInput) {
 			t.Fatalf("expected ErrMissingRequiredInput, got %v", err)
 		}
@@ -329,9 +328,9 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		_, err := renderer.Render(ctx, def, inputs, vars)
+		_, err := CompileTemplate("message", def.Templates[0].Content)
-		if !errors.Is(err, ErrInvalidTemplate) {
+		if err == nil {
-			t.Fatalf("expected ErrInvalidTemplate, got %v", err)
+			t.Fatal("expected template compilation to fail")
 		}
 	})
 
@@ -343,7 +342,7 @@ func TestGoRenderer_Render(t *testing.T) {
 			},
 		}
 
-		_, err := renderer.Render(ctx, def, inputs, vars)
+		_, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, vars)
 		if !errors.Is(err, ErrRenderFailure) {
 			t.Fatalf("expected ErrRenderFailure, got %v", err)
 		}
@@ -359,7 +358,7 @@ func TestGoRenderer_Render(t *testing.T) {
 				{Role: "", Content: "Hello"},
 			},
 		}
-		_, err := renderer.Render(ctx, def, inputs, vars)
+		_, err := capturedTestRenderer(t, def).Render(ctx, def, inputs, vars)
 		if !errors.Is(err, ErrInvalidMessageRole) {
 			t.Fatalf("expected ErrInvalidMessageRole, got %v", err)
 		}
@@ -371,7 +370,7 @@ func TestGoRenderer_Render(t *testing.T) {
 				{Role: " \u2003DeVeLoPeR\u2003 ", Content: "Hello"},
 			},
 		}
-		res, err := renderer.Render(ctx, def, nil, vars)
+		res, err := capturedTestRenderer(t, def).Render(ctx, def, nil, vars)
 		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
@@ -385,7 +384,7 @@ func TestGoRenderer_Render(t *testing.T) {
 		def := &domain.PromptDefinition{
 			Templates: []domain.PromptMessageTemplate{{Role: unsupportedRole, Content: "Hello"}},
 		}
-		_, err := renderer.Render(ctx, def, nil, vars)
+		_, err := capturedTestRenderer(t, def).Render(ctx, def, nil, vars)
 		if !errors.Is(err, ErrInvalidMessageRole) {
 			t.Fatalf("expected ErrInvalidMessageRole, got %v", err)
 		}
@@ -396,9 +395,9 @@ func TestGoRenderer_Render(t *testing.T) {
 }
 
 func TestGoRendererCancellation(t *testing.T) {
-	t.Run("before session parsing", func(t *testing.T) {
+	t.Run("before rendering", func(t *testing.T) {
 		definition := &domain.PromptDefinition{
-			SessionID: "{{ malformed",
+			SessionID: "{{.session}}",
 			Templates: []domain.PromptMessageTemplate{
 				{Role: "user", Content: "not rendered"},
 			},
@@ -406,18 +405,11 @@ func TestGoRendererCancellation(t *testing.T) {
 		ctx, cancel := context.WithCancel(context.Background())
 		cancel()
 
-		result, err := NewGoRenderer().Render(ctx, definition, nil, nil)
+		renderer := capturedTestRenderer(t, definition)
+		result, err := renderer.Render(ctx, definition, nil, nil)
 		if result != nil || !errors.Is(err, context.Canceled) {
 			t.Fatalf("result=%#v err=%v, want nil/context.Canceled", result, err)
 		}
-		if errors.Is(err, ErrInvalidTemplate) {
-			t.Fatalf("pre-canceled render parsed the malformed session: %v", err)
-		}
-
-		result, err = NewGoRenderer().Render(context.Background(), definition, nil, nil)
-		if result != nil || !errors.Is(err, ErrInvalidTemplate) {
-			t.Fatalf("active render result=%#v err=%v, want nil/ErrInvalidTemplate", result, err)
-		}
 	})
 
 	t.Run("during artifact text conversion", func(t *testing.T) {
@@ -447,14 +439,15 @@ func TestGoRendererCancellation(t *testing.T) {
 			},
 		}
 		counter := &checkCountingContext{Context: context.Background()}
-		if _, err := NewGoRenderer().Render(counter, definition, nil, nil); err != nil {
+		renderer := capturedTestRenderer(t, definition)
+		if _, err := renderer.Render(counter, definition, nil, nil); err != nil {
 			t.Fatalf("count render checkpoints: %v", err)
 		}
 
 		// The final three checks occur after template execution, after the
 		// message is assembled, and immediately before publication.
 		ctx := newCancelOnCheckContext(counter.checks - 2)
-		result, err := NewGoRenderer().Render(ctx, definition, nil, nil)
+		result, err := renderer.Render(ctx, definition, nil, nil)
 		if result != nil || !errors.Is(err, context.Canceled) {
 			t.Fatalf("result=%#v err=%v, want nil/context.Canceled", result, err)
 		}
@@ -472,7 +465,8 @@ func TestGoRendererArtifactTextLifecycle(t *testing.T) {
 		},
 	}
 
-	first, err := NewGoRenderer().Render(context.Background(), definition, inputs, nil)
+	renderer := capturedTestRenderer(t, definition)
+	first, err := renderer.Render(context.Background(), definition, inputs, nil)
 	if err != nil {
 		t.Fatalf("first render: %v", err)
 	}
@@ -488,7 +482,7 @@ func TestGoRendererArtifactTextLifecycle(t *testing.T) {
 	if bytes.Equal([]byte(first.Messages[0].Content), append(append(append([]byte(nil), body...), '|'), body...)) {
 		t.Fatal("completed render aliases the artifact body")
 	}
-	second, err := NewGoRenderer().Render(context.Background(), definition, inputs, nil)
+	second, err := renderer.Render(context.Background(), definition, inputs, nil)
 	if err != nil {
 		t.Fatalf("second render: %v", err)
 	}
@@ -498,7 +492,7 @@ func TestGoRendererArtifactTextLifecycle(t *testing.T) {
 	}
 
 	nilInputs := map[string]*domain.Artifact{"document": nil}
-	result, err := NewGoRenderer().Render(context.Background(), definition, nilInputs, nil)
+	result, err := renderer.Render(context.Background(), definition, nilInputs, nil)
 	if result != nil || !errors.Is(err, ErrUnknownInput) || !errors.Is(err, ErrRenderFailure) {
 		t.Fatalf("nil input result=%#v err=%v, want ErrUnknownInput and ErrRenderFailure", result, err)
 	}
@@ -559,11 +553,56 @@ func TestCompiledRendererKeepsConcurrentRequestsIndependent(t *testing.T) {
 	}
 }
 
+func TestCompiledRendererRequiresCapturedTemplates(t *testing.T) {
+	message, err := CompileTemplate("message", "hello")
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, tc := range []struct {
+		name      string
+		lookup    TemplateLookup
+		sessionID string
+	}{
+		{name: "missing lookup"},
+		{name: "missing prompt", lookup: compiledRendererTestLookup{id: "other"}},
+		{name: "missing message", lookup: compiledRendererTestLookup{id: "prompt"}},
+		{name: "nil message", lookup: compiledRendererTestLookup{id: "prompt", templates: CompiledTemplates{Messages: []*template.Template{nil}}}},
+		{name: "missing session", lookup: compiledRendererTestLookup{id: "prompt", templates: CompiledTemplates{Messages: []*template.Template{message}}}, sessionID: "session"},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			definition := &domain.PromptDefinition{ID: "prompt", SessionID: tc.sessionID, Templates: []domain.PromptMessageTemplate{{Role: "user", Content: "hello"}}}
+			if _, err := NewCompiledRenderer(tc.lookup).Render(context.Background(), definition, nil, nil); !errors.Is(err, ErrRenderFailure) {
+				t.Fatalf("render error = %v, want render failure", err)
+			}
+		})
+	}
+}
+
 type compiledRendererTestLookup struct {
 	id        string
 	templates CompiledTemplates
 }
 
+func capturedTestRenderer(t testing.TB, definition *domain.PromptDefinition) Renderer {
+	t.Helper()
+	var compiled CompiledTemplates
+	var err error
+	if definition.SessionID != "" {
+		compiled.Session, err = CompileTemplate("session", definition.SessionID)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	for _, message := range definition.Templates {
+		parsed, err := CompileTemplate("message", message.Content)
+		if err != nil {
+			t.Fatal(err)
+		}
+		compiled.Messages = append(compiled.Messages, parsed)
+	}
+	return NewCompiledRenderer(compiledRendererTestLookup{id: definition.ID, templates: compiled})
+}
+
 func (lookup compiledRendererTestLookup) GetCompiledTemplates(id string) (CompiledTemplates, bool) {
 	if id != lookup.id {
 		return CompiledTemplates{}, false
@@ -571,8 +610,7 @@ func (lookup compiledRendererTestLookup) GetCompiledTemplates(id string) (Compil
 	return lookup.templates, true
 }
 
-// BenchmarkGoRendererArtifactReferences measures NewGoRenderer's per-call
+// BenchmarkGoRendererArtifactReferences measures rendering captured templates.
-// template-parsing fallback rather than the captured compiled path.
 func BenchmarkGoRendererArtifactReferences(b *testing.B) {
 	body := bytes.Repeat([]byte("document content "), (artifactTextChunkSize*4)/len("document content "))
 	inputs := map[string]*domain.Artifact{
@@ -604,7 +642,7 @@ func BenchmarkGoRendererArtifactReferences(b *testing.B) {
 
 	for _, tc := range tests {
 		b.Run(tc.name, func(b *testing.B) {
-			renderer := NewGoRenderer()
+			renderer := capturedTestRenderer(b, tc.definition)
 			b.ReportAllocs()
 			b.SetBytes(int64(len(body)))
 			for range b.N {

internal/prompt/requirements_test.go

@@ -314,7 +314,7 @@ func TestAnalyzeRequirementsClassifiesKnownConditions(t *testing.T) {
 				"active":   {Name: "active", Body: []byte("active")},
 				"inactive": {Name: "inactive", Body: []byte("inactive")},
 			}
-			rendered, err := NewGoRenderer().Render(context.Background(), definition, artifacts, test.vars)
+			rendered, err := capturedTestRenderer(t, definition).Render(context.Background(), definition, artifacts, test.vars)
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -526,7 +526,7 @@ func TestAnalyzeRequirementsResolvesSimpleInputNames(t *testing.T) {
 				t.Fatalf("name-source caller key classification is incorrect: %+v", result.Variables)
 			}
 			artifacts := map[string]*domain.Artifact{inputName: {Name: inputName, Body: []byte("resolved")}}
-			rendered, err := NewGoRenderer().Render(context.Background(), definition, artifacts, test.vars)
+			rendered, err := capturedTestRenderer(t, definition).Render(context.Background(), definition, artifacts, test.vars)
 			if err != nil {
 				t.Fatal(err)
 			}

internal/usecase/runner_test.go

@@ -13,6 +13,7 @@ import (
 	"strings"
 	"sync"
 	"testing"
+	"text/template"
 	"time"
 
 	"go.maximumdirect.net/promptkit/internal/capacity"
@@ -41,6 +42,36 @@ type staticPromptRepo struct {
 	def *domain.PromptDefinition
 }
 
+type capturedTemplateFixture struct {
+	id        string
+	templates prompt.CompiledTemplates
+}
+
+func (fixture capturedTemplateFixture) GetCompiledTemplates(id string) (prompt.CompiledTemplates, bool) {
+	return fixture.templates, id == fixture.id
+}
+
+func testCompiledRenderer(t *testing.T, definition *domain.PromptDefinition) prompt.Renderer {
+	t.Helper()
+	var templates prompt.CompiledTemplates
+	if definition.SessionID != "" {
+		var err error
+		templates.Session, err = prompt.CompileTemplate("session", definition.SessionID)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	templates.Messages = make([]*template.Template, 0, len(definition.Templates))
+	for _, message := range definition.Templates {
+		compiled, err := prompt.CompileTemplate("message", message.Content)
+		if err != nil {
+			t.Fatal(err)
+		}
+		templates.Messages = append(templates.Messages, compiled)
+	}
+	return prompt.NewCompiledRenderer(capturedTemplateFixture{id: definition.ID, templates: templates})
+}
+
 func (r staticPromptRepo) GetPromptSnapshot(
 	context.Context,
 	string,
@@ -449,7 +480,7 @@ func TestRunnerDirectSessionResolution(t *testing.T) {
 			&fakeExecutionProfileRepo{profiles: map[string]*domain.ExecutionProfile{"exec": defaultExecutionProfile()}},
 
 			defaultArtifactReader(),
-			prompt.NewGoRenderer(),
+			testCompiledRenderer(t, def),
 			&fakeLLM{forbid: true},
 			nil, nil)
 
@@ -496,7 +527,7 @@ func TestRunnerDirectSessionResolution(t *testing.T) {
 			&fakeExecutionProfileRepo{profiles: map[string]*domain.ExecutionProfile{"exec": defaultExecutionProfile()}},
 
 			defaultArtifactReader(),
-			prompt.NewGoRenderer(),
+			testCompiledRenderer(t, def),
 			&fakeLLM{forbid: true},
 			nil, nil)
 
@@ -526,7 +557,7 @@ func TestRunnerDirectSessionResolution(t *testing.T) {
 			&fakeExecutionProfileRepo{profiles: map[string]*domain.ExecutionProfile{"exec": defaultExecutionProfile()}},
 
 			defaultArtifactReader(),
-			prompt.NewGoRenderer(),
+			testCompiledRenderer(t, def),
 			&fakeLLM{forbid: true},
 			nil, nil)
 
@@ -886,7 +917,7 @@ func TestRunnerPrepareRequiredInputMissingFails(t *testing.T) {
 		&fakeExecutionProfileRepo{profiles: map[string]*domain.ExecutionProfile{"exec": defaultExecutionProfile()}},
 
 		defaultArtifactReader(),
-		prompt.NewGoRenderer(),
+		testCompiledRenderer(t, def),
 		&fakeLLM{forbid: true},
 		nil, nil)
 
@@ -913,7 +944,7 @@ func TestRunnerPrepareUnknownTemplateInputReferenceFails(t *testing.T) {
 		&fakeExecutionProfileRepo{profiles: map[string]*domain.ExecutionProfile{"exec": defaultExecutionProfile()}},
 
 		defaultArtifactReader(),
-		prompt.NewGoRenderer(),
+		testCompiledRenderer(t, def),
 		&fakeLLM{forbid: true},
 		nil, nil)