diff --git a/fpdfsdk/fpdf_signature_embeddertest.cpp b/fpdfsdk/fpdf_signature_embeddertest.cpp
index 851df00..3face6e 100644
--- a/fpdfsdk/fpdf_signature_embeddertest.cpp
+++ b/fpdfsdk/fpdf_signature_embeddertest.cpp
@@ -36,3 +36,32 @@
   // Provide no document.
   EXPECT_EQ(nullptr, FPDF_GetSignatureObject(nullptr, 0));
 }
+
+TEST_F(FPDFSignatureEmbedderTest, GetContents) {
+  EXPECT_TRUE(OpenDocument("two_signatures.pdf"));
+  FPDF_SIGNATURE signature = FPDF_GetSignatureObject(document(), 0);
+  EXPECT_NE(nullptr, signature);
+
+  // FPDFSignatureObj_GetContents() positive testing.
+  unsigned long size = FPDFSignatureObj_GetContents(signature, nullptr, 0);
+  const uint8_t kExpectedContents[] = {0x30, 0x80, 0x06, 0x09, 0x2A, 0x86, 0x48,
+                                       0x86, 0xF7, 0x0D, 0x01, 0x07, 0x02, 0xA0,
+                                       0x80, 0x30, 0x80, 0x02, 0x01, 0x01};
+  ASSERT_EQ(sizeof(kExpectedContents), size);
+  std::vector<char> contents(size);
+  ASSERT_EQ(size,
+            FPDFSignatureObj_GetContents(signature, contents.data(), size));
+  ASSERT_EQ(0, memcmp(kExpectedContents, contents.data(), size));
+
+  // FPDFSignatureObj_GetContents() negative testing.
+  ASSERT_EQ(0U, FPDFSignatureObj_GetContents(nullptr, nullptr, 0));
+
+  contents.resize(2);
+  contents[0] = 'x';
+  contents[1] = '\0';
+  size =
+      FPDFSignatureObj_GetContents(signature, contents.data(), contents.size());
+  ASSERT_EQ(sizeof(kExpectedContents), size);
+  EXPECT_EQ('x', contents[0]);
+  EXPECT_EQ('\0', contents[1]);
+}