Add model registry tests

Lookup by canonical ID, bare name, and normalized form.
Capability assertions for Claude, GPT-5.4, and o3. Edge
cases for empty string and provider-prefix-only inputs.

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/llm/registry_test.go

@@ -0,0 +1,142 @@
+// Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package llm_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"go.probo.inc/probo/pkg/llm"
+)
+
+func TestRegistry_Lookup(t *testing.T) {
+	t.Parallel()
+
+	r := llm.DefaultRegistry()
+
+	t.Run(
+		"by full openrouter id",
+		func(t *testing.T) {
+			t.Parallel()
+
+			m, ok := r.Lookup("anthropic/claude-opus-4.6")
+			require.True(t, ok)
+			assert.Equal(t, "anthropic", m.Provider)
+			assert.Greater(t, m.ContextLength, 0)
+			assert.Greater(t, m.MaxOutputTokens, 0)
+		},
+	)
+
+	t.Run(
+		"by bare name with dots",
+		func(t *testing.T) {
+			t.Parallel()
+
+			m, ok := r.Lookup("claude-opus-4.6")
+			require.True(t, ok)
+			assert.Equal(t, "anthropic", m.Provider)
+		},
+	)
+
+	t.Run(
+		"by bare name with dashes",
+		func(t *testing.T) {
+			t.Parallel()
+
+			m, ok := r.Lookup("claude-opus-4-6")
+			require.True(t, ok)
+			assert.Equal(t, "anthropic", m.Provider)
+		},
+	)
+
+	t.Run(
+		"unknown model returns false",
+		func(t *testing.T) {
+			t.Parallel()
+
+			_, ok := r.Lookup("nonexistent-model-42")
+			assert.False(t, ok)
+		},
+	)
+
+	t.Run(
+		"empty string returns false",
+		func(t *testing.T) {
+			t.Parallel()
+
+			_, ok := r.Lookup("")
+			assert.False(t, ok)
+		},
+	)
+
+	t.Run(
+		"provider prefix only returns false",
+		func(t *testing.T) {
+			t.Parallel()
+
+			_, ok := r.Lookup("anthropic/")
+			assert.False(t, ok)
+		},
+	)
+}
+
+func TestRegistry_Capabilities(t *testing.T) {
+	t.Parallel()
+
+	r := llm.DefaultRegistry()
+
+	t.Run(
+		"anthropic claude supports temperature and top_p but not frequency_penalty",
+		func(t *testing.T) {
+			t.Parallel()
+
+			m, ok := r.Lookup("anthropic/claude-opus-4.6")
+			require.True(t, ok)
+			assert.True(t, m.Supports.Temperature)
+			assert.True(t, m.Supports.TopP)
+			assert.True(t, m.Supports.TopK)
+			assert.True(t, m.Supports.Reasoning)
+			assert.False(t, m.Supports.FrequencyPenalty)
+			assert.False(t, m.Supports.PresencePenalty)
+		},
+	)
+
+	t.Run(
+		"openai gpt-5.4 is a reasoning model without temperature",
+		func(t *testing.T) {
+			t.Parallel()
+
+			m, ok := r.Lookup("openai/gpt-5.4")
+			require.True(t, ok)
+			assert.True(t, m.Supports.Reasoning)
+			assert.True(t, m.Supports.Seed)
+			assert.False(t, m.Supports.Temperature)
+			assert.False(t, m.Supports.TopP)
+		},
+	)
+
+	t.Run(
+		"openai o3 is a reasoning model without temperature",
+		func(t *testing.T) {
+			t.Parallel()
+
+			m, ok := r.Lookup("openai/o3")
+			require.True(t, ok)
+			assert.True(t, m.Supports.Reasoning)
+			assert.False(t, m.Supports.Temperature)
+		},
+	)
+}