test: plain map/slice CLI flags

cmd/avrogen/main_test.go

@@ -189,6 +189,33 @@ func TestAvroGen_GeneratesSchemaWithStrictTypes(t *testing.T) {
 	assert.Equal(t, want, got)
 }
 
+func TestAvroGen_GeneratePlain(t *testing.T) {
+	for _, opt := range []string{"map", "slice"} {
+		t.Run(opt, func(t *testing.T) {
+			t.Parallel()
+
+			path := t.TempDir()
+			file := filepath.Join(path, "test.go")
+
+			args := []string{"avrogen", "-pkg", "testpkg", "-o", file, "-plain-" + opt, "testdata/schema.avsc"}
+			gotCode := realMain(args, io.Discard, io.Discard)
+			require.Equal(t, 0, gotCode)
+
+			got, err := os.ReadFile(file)
+			require.NoError(t, err)
+
+			if *update {
+				err = os.WriteFile("testdata/golden_plain"+opt+".go", got, 0600)
+				require.NoError(t, err)
+			}
+
+			want, err := os.ReadFile("testdata/golden_plain" + opt + ".go")
+			require.NoError(t, err)
+			assert.Equal(t, want, got)
+		})
+	}
+}
+
 func TestParseTags(t *testing.T) {
 	tests := []struct {
 		name string

cmd/avrogen/testdata/schema.avsc

@@ -5,6 +5,8 @@
   "doc": "Test is a test struct",
   "fields": [
     { "name": "someString", "type": "string", "doc": "SomeString is a string" },
-    { "name": "someInt", "type": "int" }
+    { "name": "someInt", "type": "int" },
+    { "name":  "someNullableMap", "type":  ["null", {"type": "map", "values": "int"}]},
+    { "name":  "someNullableSlice", "type":  ["null", {"type": "array", "items": "int"}]}
   ]
-}
+}