u4: add core infrastructure scaffolding

1 files changed, 40 insertions, 0 deletions

diff --git a/internal/apicircuit/apicircuit_test.go b/internal/apicircuit/apicircuit_test.go
new file mode 100644
index 0000000..842a0f2
--- /dev/null
+++ b/internal/apicircuit/apicircuit_test.go
@@ -0,0 +1,40 @@
+package apicircuit
+
+import (
+	"context"
+	"errors"
+	"testing"
+)
+
+func TestGeminiTTS_Success(t *testing.T) {
+	t.Parallel()
+
+	v, err := GeminiTTS(func() (string, error) {
+		return "ok", nil
+	})
+	if err != nil || v != "ok" {
+		t.Fatalf("GeminiTTS() = %q, %v; want ok, nil", v, err)
+	}
+}
+
+func TestGeminiImage_Success(t *testing.T) {
+	t.Parallel()
+
+	v, err := GeminiImage(func() (int, error) {
+		return 42, nil
+	})
+	if err != nil || v != 42 {
+		t.Fatalf("GeminiImage() = %d, %v; want 42, nil", v, err)
+	}
+}
+
+func TestIsSuccessful_ContextCanceled(t *testing.T) {
+	t.Parallel()
+
+	if !isSuccessful(context.Canceled) {
+		t.Fatal("context.Canceled should not count as breaker failure")
+	}
+	if isSuccessful(errors.New("api error")) {
+		t.Fatal("arbitrary errors must count as failure")
+	}
+}