2 files changed, 59 insertions, 1 deletions
diff --git a/test/buildtool/crypto/TARGETS b/test/buildtool/crypto/TARGETS
index 179d70ad..44800068 100644
--- a/test/buildtool/crypto/TARGETS
+++ b/test/buildtool/crypto/TARGETS
@@ -9,5 +9,17 @@
     ]
   , "stage": ["test", "buildtool", "crypto"]
   }
-, "TESTS": {"type": "install", "tainted": ["test"], "deps": ["crypto"]}
+, "hash_function":
+  { "type": ["@", "rules", "CC/test", "test"]
+  , "name": ["hash_function"]
+  , "srcs": ["hash_function.test.cpp"]
+  , "deps":
+    [ ["@", "catch2", "", "catch2"]
+    , ["test", "catch-main"]
+    , ["src/buildtool/crypto", "hash_function"]
+    ]
+  , "stage": ["test", "buildtool", "crypto"]
+  }
+, "TESTS":
+  {"type": "install", "tainted": ["test"], "deps": ["crypto", "hash_function"]}
 }
diff --git a/test/buildtool/crypto/hash_function.test.cpp b/test/buildtool/crypto/hash_function.test.cpp
new file mode 100644
index 00000000..b56c82a6
--- /dev/null
+++ b/test/buildtool/crypto/hash_function.test.cpp
@@ -0,0 +1,46 @@
+#include "catch2/catch.hpp"
+#include "src/buildtool/crypto/hash_function.hpp"
+
+TEST_CASE("Hash Function", "[crypto]") {
+    std::string bytes{"test"};
+
+    SECTION("Native") {
+        HashFunction::SetHashType(HashFunction::JustHash::Native);
+
+        // same as: echo -n test | sha1sum
+        CHECK(HashFunction::ComputeHash(bytes).HexString() ==
+              "a94a8fe5ccb19ba61c4c0873d391e987982fbbd3");
+        // same as: echo -n test | git hash-object --stdin
+        CHECK(HashFunction::ComputeBlobHash(bytes).HexString() ==
+              "30d74d258442c7c65512eafab474568dd706c430");
+        // same as: echo -n test | git hash-object -t "tree" --stdin --literally
+        CHECK(HashFunction::ComputeTreeHash(bytes).HexString() ==
+              "5f0ecc1a989593005e80f457446133250fcc43cc");
+
+        auto hasher = HashFunction::Hasher();
+        hasher.Update(bytes);
+        CHECK(std::move(hasher).Finalize()->HexString() ==  // NOLINT
+              "a94a8fe5ccb19ba61c4c0873d391e987982fbbd3");
+    }
+
+    SECTION("Compatible") {
+        HashFunction::SetHashType(HashFunction::JustHash::Compatible);
+
+        // all same as: echo -n test | sha256sum
+        CHECK(
+            HashFunction::ComputeHash(bytes).HexString() ==
+            "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08");
+        CHECK(
+            HashFunction::ComputeBlobHash(bytes).HexString() ==
+            "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08");
+        CHECK(
+            HashFunction::ComputeTreeHash(bytes).HexString() ==
+            "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08");
+
+        auto hasher = HashFunction::Hasher();
+        hasher.Update(bytes);
+        CHECK(
+            std::move(hasher).Finalize()->HexString() ==  // NOLINT
+            "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08");
+    }
+}