diff --git a/test/fixtures/blank.gif b/test/fixtures/blank.gif
new file mode 100644
index 0000000..75b945d
Binary files /dev/null and b/test/fixtures/blank.gif differ
diff --git a/test/helpers.js b/test/helpers.js
index 465c406..9c89de2 100644
--- a/test/helpers.js
+++ b/test/helpers.js
@@ -137,6 +137,9 @@ function testInflate(samples, inflateOptions, deflateOptions, callback) {
   //
   for (name in samples) {
     data = samples[name];
+
+    // always use the same data type to generate sample
+    pako_utils.setTyped(true);
     deflated = pako.deflate(data, deflateOptions);
 
     // with untyped arrays
diff --git a/test/inflate.js b/test/inflate.js
index 94c9e8b..694e290 100644
--- a/test/inflate.js
+++ b/test/inflate.js
@@ -123,9 +123,30 @@ describe('Inflate strategy', function () {
 
 describe('Inflate RAW', function () {
   // Since difference is only in rwapper, test for store/fast/slow methods are enougth
+  it('level 9', function(done) {
+    testInflate(samples, { raw: true }, { level: 9, raw: true }, done);
+  });
+  it('level 8', function(done) {
+    testInflate(samples, { raw: true }, { level: 8, raw: true }, done);
+  });
+  it('level 7', function(done) {
+    testInflate(samples, { raw: true }, { level: 7, raw: true }, done);
+  });
+  it('level 6', function(done) {
+    testInflate(samples, { raw: true }, { level: 6, raw: true }, done);
+  });
+  it('level 5', function(done) {
+    testInflate(samples, { raw: true }, { level: 5, raw: true }, done);
+  });
   it('level 4', function(done) {
     testInflate(samples, { raw: true }, { level: 4, raw: true }, done);
   });
+  it('level 3', function(done) {
+    testInflate(samples, { raw: true }, { level: 3, raw: true }, done);
+  });
+  it('level 2', function(done) {
+    testInflate(samples, { raw: true }, { level: 2, raw: true }, done);
+  });
   it('level 1', function(done) {
     testInflate(samples, { raw: true }, { level: 1, raw: true }, done);
   });