feat(coderd): generate task names based on their prompt (#19335)

Closes https://github.com/coder/coder/issues/18159

If an Anthropic API key is available, we call out to Claude to generate
a task name based on the user-provided prompt instead of our random name
generator.

coderd/taskname/taskname_test.go

@@ -0,0 +1,48 @@
+package taskname_test
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/coder/coder/v2/coderd/taskname"
+	"github.com/coder/coder/v2/codersdk"
+	"github.com/coder/coder/v2/testutil"
+)
+
+const (
+	anthropicEnvVar = "ANTHROPIC_API_KEY"
+)
+
+func TestGenerateTaskName(t *testing.T) {
+	t.Parallel()
+
+	t.Run("Fallback", func(t *testing.T) {
+		t.Parallel()
+
+		ctx := testutil.Context(t, testutil.WaitShort)
+
+		name, err := taskname.Generate(ctx, "Some random prompt")
+		require.ErrorIs(t, err, taskname.ErrNoAPIKey)
+		require.Equal(t, "", name)
+	})
+
+	t.Run("Anthropic", func(t *testing.T) {
+		t.Parallel()
+
+		apiKey := os.Getenv(anthropicEnvVar)
+		if apiKey == "" {
+			t.Skipf("Skipping test as %s not set", anthropicEnvVar)
+		}
+
+		ctx := testutil.Context(t, testutil.WaitShort)
+
+		name, err := taskname.Generate(ctx, "Create a finance planning app", taskname.WithAPIKey(apiKey))
+		require.NoError(t, err)
+		require.NotEqual(t, "", name)
+
+		err = codersdk.NameValid(name)
+		require.NoError(t, err, "name should be valid")
+	})
+}