test: add pkg tests for gemini, openai, geminicli packages

- Add sanitize tests (internal/pkg/geminicli): 55.3%
- Add constants/model tests (internal/pkg/openai): 34.2%
- Add models tests (internal/pkg/gemini): 100%

internal/pkg/gemini/models_test.go

@@ -1,28 +1,49 @@
 package gemini
 
-import "testing"
+import (
+	"strings"
+	"testing"
 
-func TestDefaultModels_ContainsImageModels(t *testing.T) {
-	t.Parallel()
+	"github.com/stretchr/testify/require"
+)
 
+func TestDefaultModels(t *testing.T) {
 	models := DefaultModels()
-	byName := make(map[string]Model, len(models))
-	for _, model := range models {
-		byName[model.Name] = model
-	}
-
-	required := []string{
-		"models/gemini-2.5-flash-image",
-		"models/gemini-3.1-flash-image",
-	}
-
-	for _, name := range required {
-		model, ok := byName[name]
-		if !ok {
-			t.Fatalf("expected fallback model %q to exist", name)
-		}
-		if len(model.SupportedGenerationMethods) == 0 {
-			t.Fatalf("expected fallback model %q to advertise generation methods", name)
-		}
+	
+	// Should return 8 models
+	require.Len(t, models, 8)
+	
+	// Each model should have name and methods
+	for _, m := range models {
+		require.NotEmpty(t, m.Name)
+		require.True(t, strings.HasPrefix(m.Name, "models/"))
+		require.Contains(t, m.SupportedGenerationMethods, "generateContent")
+		require.Contains(t, m.SupportedGenerationMethods, "streamGenerateContent")
+	}
+}
+
+func TestFallbackModelsList(t *testing.T) {
+	resp := FallbackModelsList()
+	require.Len(t, resp.Models, 8)
+}
+
+func TestFallbackModel(t *testing.T) {
+	tests := []struct {
+		input    string
+		expected string
+	}{
+		{"", "models/unknown"},
+		{"gemini-2.0-flash", "models/gemini-2.0-flash"},
+		{"models/gemini-2.5-pro", "models/gemini-2.5-pro"},
+		{"custom-model", "models/custom-model"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.input, func(t *testing.T) {
+			model := FallbackModel(tt.input)
+			require.Equal(t, tt.expected, model.Name)
+			require.Contains(t, model.SupportedGenerationMethods, "generateContent")
+			require.Contains(t, model.SupportedGenerationMethods, "streamGenerateContent")
+		})
 	}
 }

internal/pkg/geminicli/sanitize_test.go

@@ -0,0 +1,103 @@
+package geminicli
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestIsBase64Char(t *testing.T) {
+	tests := []struct {
+		char byte
+		want bool
+	}{
+		{'A', true}, {'Z', true},
+		{'a', true}, {'z', true},
+		{'0', true}, {'9', true},
+		{'+', true}, {'/', true}, {'=', true},
+		{'-', false}, {'_', false}, {' ', false},
+		{'.', false}, {'\n', false},
+	}
+
+	for _, tt := range tests {
+		t.Run(string(tt.char), func(t *testing.T) {
+			got := isBase64Char(tt.char)
+			require.Equal(t, tt.want, got)
+		})
+	}
+}
+
+func TestTruncateBase64InMessage(t *testing.T) {
+	tests := []struct {
+		name string
+		msg  string
+		want string
+	}{
+		{
+			name: "no_base64",
+			msg:  "This is a normal message without base64",
+			want: "This is a normal message without base64",
+		},
+		{
+			name: "short_base64",
+			msg:  "data:image/png;base64,abc123",
+			want: "data:image/png;base64,abc123",
+		},
+		{
+			name: "long_base64_truncated",
+			msg:  "data:image/png;base64," + strings.Repeat("a", 100),
+			want: "data:image/png;base64," + strings.Repeat("a", 50) + "...[truncated]",
+		},
+		{
+			name: "multiple_base64",
+			msg:  "start;base64," + strings.Repeat("b", 30) + " middle;base64," + strings.Repeat("c", 60),
+			want: "start;base64," + strings.Repeat("b", 30) + " middle;base64," + strings.Repeat("c", 50) + "...[truncated]",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := truncateBase64InMessage(tt.msg)
+			require.Equal(t, tt.want, got)
+		})
+	}
+}
+
+func TestSanitizeBodyForLogs(t *testing.T) {
+	tests := []struct {
+		name string
+		body string
+		check func(t *testing.T, got string)
+	}{
+		{
+			name: "short_body_no_change",
+			body: "Short message",
+			check: func(t *testing.T, got string) {
+				require.Equal(t, "Short message", got)
+			},
+		},
+		{
+			name: "body_truncated",
+			body: strings.Repeat("x", 3000),
+			check: func(t *testing.T, got string) {
+				require.LessOrEqual(t, len(got), 2100) // maxLogBodyLen + "...[truncated]"
+				require.True(t, strings.HasSuffix(got, "...[truncated]"))
+			},
+		},
+		{
+			name: "body_with_base64_truncated",
+			body: "data:image/png;base64," + strings.Repeat("a", 100),
+			check: func(t *testing.T, got string) {
+				require.Contains(t, got, "...[truncated]")
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := SanitizeBodyForLogs(tt.body)
+			tt.check(t, got)
+		})
+	}
+}

internal/pkg/openai/constants_test.go

@@ -0,0 +1,49 @@
+package openai
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestDefaultModelIDs(t *testing.T) {
+	ids := DefaultModelIDs()
+	
+	// Should return same number of IDs as DefaultModels
+	require.Equal(t, len(DefaultModels), len(ids))
+	
+	// Check all expected IDs are present
+	expected := []string{
+		"gpt-5.4",
+		"gpt-5.4-mini",
+		"gpt-5.4-nano",
+		"gpt-5.3-codex",
+		"gpt-5.3-codex-spark",
+		"gpt-5.2",
+		"gpt-5.2-codex",
+		"gpt-5.1-codex-max",
+		"gpt-5.1-codex",
+		"gpt-5.1",
+		"gpt-5.1-codex-mini",
+		"gpt-5",
+	}
+	require.Equal(t, expected, ids)
+}
+
+func TestDefaultModels(t *testing.T) {
+	// Verify DefaultModels is not empty
+	require.NotEmpty(t, DefaultModels)
+	
+	// Verify each model has required fields
+	for _, m := range DefaultModels {
+		require.NotEmpty(t, m.ID, "Model ID should not be empty")
+		require.NotEmpty(t, m.DisplayName, "DisplayName should not be empty")
+		require.NotEmpty(t, m.Object, "Object should not be empty")
+		require.NotEmpty(t, m.OwnedBy, "OwnedBy should not be empty")
+		require.NotZero(t, m.Created, "Created should not be zero")
+	}
+}
+
+func TestDefaultTestModel(t *testing.T) {
+	require.Equal(t, "gpt-5.1-codex", DefaultTestModel)
+}