diff --git a/src/libstore/tests/derivation.cc b/src/libstore/tests/derivation.cc
new file mode 100644
index 000000000..c9d404188
--- /dev/null
+++ b/src/libstore/tests/derivation.cc
@@ -0,0 +1,115 @@
+#include <nlohmann/json.hpp>
+#include <gtest/gtest.h>
+
+#include "derivations.hh"
+
+#include "tests/libstore.hh"
+
+namespace nix {
+
+class DerivationTest : public LibStoreTest
+{
+};
+
+#define TEST_JSON(TYPE, NAME, STR, VAL, ...)                           \
+    TEST_F(DerivationTest, TYPE ## _ ## NAME ## _to_json) {            \
+        using nlohmann::literals::operator "" _json;                   \
+        ASSERT_EQ(                                                     \
+            STR ## _json,                                              \
+            (TYPE { VAL }).toJSON(*store __VA_OPT__(,) __VA_ARGS__));  \
+    }
+
+TEST_JSON(DerivationOutput, inputAddressed,
+    R"({
+        "path": "/nix/store/c015dhfh5l0lp6wxyvdn7bmwhbbr6hr9-drv-name-output-name"
+    })",
+    (DerivationOutput::InputAddressed {
+        .path = store->parseStorePath("/nix/store/c015dhfh5l0lp6wxyvdn7bmwhbbr6hr9-drv-name-output-name"),
+    }),
+    "drv-name", "output-name")
+
+TEST_JSON(DerivationOutput, caFixed,
+    R"({
+        "hashAlgo": "r:sha256",
+        "hash": "894517c9163c896ec31a2adbd33c0681fd5f45b2c0ef08a64c92a03fb97f390f",
+        "path": "/nix/store/c015dhfh5l0lp6wxyvdn7bmwhbbr6hr9-drv-name-output-name"
+    })",
+    (DerivationOutput::CAFixed {
+        .hash = {
+            .method = FileIngestionMethod::Recursive,
+            .hash = Hash::parseAnyPrefixed("sha256-iUUXyRY8iW7DGirb0zwGgf1fRbLA7wimTJKgP7l/OQ8="),
+        },
+    }),
+    "drv-name", "output-name")
+
+TEST_JSON(DerivationOutput, caFloating,
+    R"({
+        "hashAlgo": "r:sha256"
+    })",
+    (DerivationOutput::CAFloating {
+        .method = FileIngestionMethod::Recursive,
+        .hashType = htSHA256,
+    }),
+    "drv-name", "output-name")
+
+TEST_JSON(DerivationOutput, deferred,
+    R"({ })",
+    DerivationOutput::Deferred { },
+    "drv-name", "output-name")
+
+TEST_JSON(DerivationOutput, impure,
+    R"({
+        "hashAlgo": "r:sha256",
+        "impure": true
+    })",
+    (DerivationOutput::Impure {
+        .method = FileIngestionMethod::Recursive,
+        .hashType = htSHA256,
+    }),
+    "drv-name", "output-name")
+
+TEST_JSON(Derivation, impure,
+    R"({
+      "inputSrcs": [
+        "/nix/store/c015dhfh5l0lp6wxyvdn7bmwhbbr6hr9-dep1"
+      ],
+      "inputDrvs": {
+        "/nix/store/c015dhfh5l0lp6wxyvdn7bmwhbbr6hr9-dep2.drv": [
+          "cat",
+          "dog"
+        ]
+      },
+      "system": "wasm-sel4",
+      "builder": "foo",
+      "args": [
+        "bar",
+        "baz"
+      ],
+      "outputs": {}
+    })",
+    ({
+        Derivation drv;
+        drv.inputSrcs = {
+            store->parseStorePath("/nix/store/c015dhfh5l0lp6wxyvdn7bmwhbbr6hr9-dep1"),
+        };
+        drv.inputDrvs = {
+            {
+                store->parseStorePath("/nix/store/c015dhfh5l0lp6wxyvdn7bmwhbbr6hr9-dep2.drv"),
+                {
+                    "cat",
+                    "dog",
+                },
+            }
+        };
+        drv.platform = "wasm-sel4";
+        drv.builder = "foo";
+        drv.args = {
+            "bar",
+            "baz",
+        };
+        drv;
+    }))
+
+#undef TEST_JSON
+
+}