diff --git a/contrib/andybalholm/brotli/brotli_test.go b/contrib/andybalholm/brotli/brotli_test.go
new file mode 100644
index 0000000..879e9f9
--- /dev/null
+++ b/contrib/andybalholm/brotli/brotli_test.go
@@ -0,0 +1,8 @@
+package brotli_test
+
+import (
+	"github.com/CAFxX/httpcompression"
+	"github.com/CAFxX/httpcompression/contrib/andybalholm/brotli"
+)
+
+var _ httpcompression.CompressorProvider = &brotli.Compressor{}
diff --git a/contrib/andybalholm/brotli/export_test.go b/contrib/andybalholm/brotli/export_test.go
new file mode 100644
index 0000000..850ac73
--- /dev/null
+++ b/contrib/andybalholm/brotli/export_test.go
@@ -0,0 +1,3 @@
+package brotli
+
+type Compressor = compressor
diff --git a/contrib/klauspost/gzip/export_test.go b/contrib/klauspost/gzip/export_test.go
new file mode 100644
index 0000000..6f0fd6c
--- /dev/null
+++ b/contrib/klauspost/gzip/export_test.go
@@ -0,0 +1,3 @@
+package gzip
+
+type Compressor = compressor
diff --git a/contrib/klauspost/gzip/gzip_test.go b/contrib/klauspost/gzip/gzip_test.go
new file mode 100644
index 0000000..7fe339a
--- /dev/null
+++ b/contrib/klauspost/gzip/gzip_test.go
@@ -0,0 +1,8 @@
+package gzip_test
+
+import (
+	"github.com/CAFxX/httpcompression"
+	"github.com/CAFxX/httpcompression/contrib/klauspost/gzip"
+)
+
+var _ httpcompression.CompressorProvider = &gzip.Compressor{}
diff --git a/contrib/klauspost/pgzip/export_test.go b/contrib/klauspost/pgzip/export_test.go
new file mode 100644
index 0000000..2bb1a1b
--- /dev/null
+++ b/contrib/klauspost/pgzip/export_test.go
@@ -0,0 +1,3 @@
+package pgzip
+
+type Compressor = compressor
diff --git a/contrib/klauspost/pgzip/pgzip_test.go b/contrib/klauspost/pgzip/pgzip_test.go
new file mode 100644
index 0000000..5aaedf3
--- /dev/null
+++ b/contrib/klauspost/pgzip/pgzip_test.go
@@ -0,0 +1,8 @@
+package pgzip_test
+
+import (
+	"github.com/CAFxX/httpcompression"
+	"github.com/CAFxX/httpcompression/contrib/klauspost/pgzip"
+)
+
+var _ httpcompression.CompressorProvider = &pgzip.Compressor{}
diff --git a/contrib/klauspost/zstd/export_test.go b/contrib/klauspost/zstd/export_test.go
new file mode 100644
index 0000000..25b3caf
--- /dev/null
+++ b/contrib/klauspost/zstd/export_test.go
@@ -0,0 +1,3 @@
+package zstd
+
+type Compressor = compressor
diff --git a/contrib/klauspost/zstd/zstd.go b/contrib/klauspost/zstd/zstd.go
index 2ae9a52..226f84f 100644
--- a/contrib/klauspost/zstd/zstd.go
+++ b/contrib/klauspost/zstd/zstd.go
@@ -9,23 +9,23 @@ import (
 
 const Encoding = "zstd"
 
-type zstdCompressor struct {
+type compressor struct {
 	pool sync.Pool
 	opts []zstd.EOption
 }
 
-func New(opts ...zstd.EOption) (c *zstdCompressor, err error) {
+func New(opts ...zstd.EOption) (c *compressor, err error) {
 	opts = append([]zstd.EOption(nil), opts...)
 	gw, err := zstd.NewWriter(nil, opts...)
 	if err != nil {
 		return nil, err
 	}
-	c = &zstdCompressor{opts: opts}
+	c = &compressor{opts: opts}
 	c.pool.Put(gw)
 	return c, nil
 }
 
-func (c *zstdCompressor) Get(w io.Writer) io.WriteCloser {
+func (c *compressor) Get(w io.Writer) io.WriteCloser {
 	if gw, ok := c.pool.Get().(*zstdWriter); ok {
 		gw.Reset(w)
 		return gw
@@ -42,7 +42,7 @@ func (c *zstdCompressor) Get(w io.Writer) io.WriteCloser {
 
 type zstdWriter struct {
 	*zstd.Encoder
-	c *zstdCompressor
+	c *compressor
 }
 
 func (w *zstdWriter) Close() error {
diff --git a/contrib/klauspost/zstd/zstd_test.go b/contrib/klauspost/zstd/zstd_test.go
new file mode 100644
index 0000000..dfd096d
--- /dev/null
+++ b/contrib/klauspost/zstd/zstd_test.go
@@ -0,0 +1,8 @@
+package zstd_test
+
+import (
+	"github.com/CAFxX/httpcompression"
+	"github.com/CAFxX/httpcompression/contrib/klauspost/zstd"
+)
+
+var _ httpcompression.CompressorProvider = &zstd.Compressor{}