diff --git a/ftpvl/fetchers.py b/ftpvl/fetchers.py
index d054f65..489026a 100644
--- a/ftpvl/fetchers.py
+++ b/ftpvl/fetchers.py
@@ -114,17 +114,47 @@ class HydraFetcher(Fetcher):
             raise IndexError(f"Invalid eval_num: {self.eval_num}")
         build_nums = evals_json["evals"][self.eval_num]["builds"]
 
-        # collect the 'meta.json' build products
+        # fetch build info and download 'meta.json'
         data = []
         for build_num in build_nums:
+            # get build info
             resp = requests.get(
-                f"https://hydra.vtr.tools/build/{build_num}/download/1/meta.json",
+                f"https://hydra.vtr.tools/build/{build_num}",
+                headers={"Content-Type": "application/json"},
+            )
+            if resp.status_code != 200:
+                raise Exception(f"Unable to get build {build_num}, got status code {resp.status_code}.")
+            
+            decoded = None
+            try:
+                decoded = resp.json()
+            except json.decoder.JSONDecodeError as err:
+                raise Exception(f"Unable to decode build {build_num} JSON file, {str(err)}")
+                
+            # check if build was successful
+            if decoded.get("buildstatus") != 0:
+                print(f"Warning: Build {build_num} failed with non-zero exit. Skipping...")
+                continue
+
+            # check if meta.json exists
+            meta_json_id = None
+            for product_id, product_desc in decoded.get("buildproducts", {}).items():
+                if product_desc.get("name", "") == "meta.json":
+                    meta_json_id = product_id
+            
+            if meta_json_id is None:
+                print(f"Warning: Build {build_num} does not contain meta.json file. Skipping...")
+                continue
+            
+            # download meta.json
+            resp = requests.get(
+                f"https://hydra.vtr.tools/build/{build_num}/download/{meta_json_id}/meta.json",
                 headers={"Content-Type": "application/json"},
             )
             if resp.status_code != 200:
                 print(
                     "Warning:",
-                    f"Unable to get build {build_num}. It might have failed.",
+                    f"Unable to get build {build_num} meta.json file.",
                 )
                 continue
             try:

diff --git a/tests/sample_data/build.large.json b/tests/sample_data/build.large.json
new file mode 100644
index 0000000..d730794
--- /dev/null
+++ b/tests/sample_data/build.large.json
@@ -0,0 +1,877 @@
+{
+    "project": "dusty",
+    "buildmetrics": {},
+    "job": "baselitex_vivado-yosys_arty",
+    "buildoutputs": {
+        "out": {
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty"
+        }
+    },
+    "jobset": "fpga-tool-perf",
+    "nixname": "fpga-tool-perf-baselitex-vivado-yosys-arty",
+    "system": "x86_64-linux",
+    "starttime": 1593129909,
+    "jobsetevals": [
+        854
+    ],
+    "priority": 100,
+    "drvpath": "/nix/store/s0badfaz2kccsyilsgrmjqhwbndxai3h-fpga-tool-perf-baselitex-vivado-yosys-arty.drv",
+    "timestamp": 1593129909,
+    "finished": 1,
+    "releasename": null,
+    "buildstatus": 0,
+    "buildproducts": {
+        "4": {
+            "sha256hash": "611fd64c8dcf9f531f6e3ca40085c6e5ece8c3e8e10ca275a8178f245383fb6c",
+            "sha1hash": "4d9b07cc8aa183c8f1c209e2755459ef0d67b056",
+            "type": "file",
+            "defaultpath": "",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.xpr",
+            "subtype": "data",
+            "filesize": 5753,
+            "name": "litex-linux.xpr"
+        },
+        "22": {
+            "defaultpath": "",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux_pgm.tcl",
+            "subtype": "data",
+            "sha1hash": "079393545687002cb94afa5987a9c38a03f3baf5",
+            "sha256hash": "d8df2f0e60cff4c2477ecc52522c7d79589799414772aae8b39a8f986b86d87b",
+            "type": "file",
+            "name": "litex-linux_pgm.tcl",
+            "filesize": 3101
+        },
+        "75": {
+            "defaultpath": "",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/litex-linux_route_status.rpt",
+            "subtype": "data",
+            "sha1hash": "2227f5e561493e61d5acfcae92337b2a04bf09e6",
+            "sha256hash": "c649a158d5349e30415bae01f5cc7ac1e804c21237c7ce399ba568ef91ff73ea",
+            "type": "file",
+            "name": "litex-linux_route_status.rpt",
+            "filesize": 651
+        },
+        "24": {
+            "defaultpath": "",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.blif",
+            "subtype": "data",
+            "sha1hash": "cb553e40fe93026693b2879f7a9fa51226f550c0",
+            "sha256hash": "8f5297666f451a815da053f6e5d49131834096fbbbc8f2b9fa3cff20bac0fb1d",
+            "type": "file",
+            "name": "litex-linux.blif",
+            "filesize": 6151493
+        },
+        "43": {
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+            "sha1hash": "b5214cfaa67e632a26065c99acf2e4925952ec88",
+            "type": "file",
+            "defaultpath": "",
+            "subtype": "data",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/vivado.jou",
+            "filesize": 891,
+            "name": "vivado.jou"
+        },
+        "80": {
+            "name": "litex-linux_methodology_drc_routed.rpt",
+            "filesize": 98389,
+            "subtype": "data",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/litex-linux_methodology_drc_routed.rpt",
+            "defaultpath": "",
+            "type": "file",
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+            "subtype": "data",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/litex-linux_utilization_placed.pb",
+            "defaultpath": "",
+            "type": "file",
+            "sha1hash": "5ab62d0ad0e2c82388b82ab5166c821cee33d384",
+            "sha256hash": "6a9e6e1df5bd47d3261604ca0775ecbd5cfeb85d59f44ff20aea9bb60b7e8384"
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+            "name": "vivado.pb",
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+            "defaultpath": ""
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+        "85": {
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+            "filesize": 124178,
+            "subtype": "data",
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+            "type": "file",
+            "name": "litex-linux_methodology_drc_routed.rpx",
+            "filesize": 199049
+        },
+        "52": {
+            "defaultpath": "",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/ISEWrap.sh",
+            "subtype": "data",
+            "sha1hash": "2ba2498220e86f4418a28466ddec413265af9cbe",
+            "sha256hash": "a9705aa05f7bfc31bbc927e1198cc23c97027ad111288c61959e6f5c98ed3574",
+            "type": "file",
+            "name": "ISEWrap.sh",
+            "filesize": 1664
+        },
+        "12": {
+            "sha256hash": "05bdbcb4365d72a605ca877b50414afc8adc740c8185af9d57889cba8e6e4252",
+            "sha1hash": "760586691239a586c64c6b0edca9f9c4cc701712",
+            "type": "file",
+            "defaultpath": "",
+            "subtype": "data",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.tcl",
+            "filesize": 122,
+            "name": "litex-linux.tcl"
+        },
+        "41": {
+            "name": "litex-linux_clock_utilization_routed.rpt",
+            "filesize": 33480,
+            "subtype": "data",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/litex-linux_clock_utilization_routed.rpt",
+            "defaultpath": "",
+            "type": "file",
+            "sha1hash": "ce652a9cf410a053b01f2527d9f916e73042e01d",
+            "sha256hash": "4a2ac94bafc57cd8155c35d864a614163d648ecd145c86d33e803292cb730dda"
+        },
+        "14": {
+            "name": "yosys.log",
+            "filesize": 4287306,
+            "subtype": "data",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/yosys.log",
+            "defaultpath": "",
+            "type": "file",
+            "sha1hash": "cc5de2657511c889eb6045c57dac0626a93da5dc",
+            "sha256hash": "90c610bff390137290733dab0a078a832f458e5741825928499c7ecdbfc46fbb"
+        },
+        "36": {
+            "filesize": 723,
+            "name": "litex-linux_power_summary_routed.pb",
+            "type": "file",
+            "sha256hash": "bb600e33b6939f2843fbb10a1924d727b66fc8874b5c37a984a51aea48a402e5",
+            "sha1hash": "6aecb965edefa093ea6543b237caf79e4d2cc50a",
+            "subtype": "data",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/litex-linux_power_summary_routed.pb",
+            "defaultpath": ""
+        },
+        "54": {
+            "name": "litex-linux_power_routed.rpt",
+            "filesize": 13455,
+            "subtype": "data",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/litex-linux_power_routed.rpt",
+            "defaultpath": "",
+            "type": "file",
+            "sha1hash": "b8de14a03d86cca34483b84cb7990cee0abc8735",
+            "sha256hash": "7b64d7149d046538c177e2f258e90df7f0cdee1ff1312bf21ddba171cddaf818"
+        },
+        "77": {
+            "filesize": 73945,
+            "name": "litex-linux.vdi",
+            "type": "file",
+            "sha256hash": "fe01547924cfa95a9359998e67128aed5b1367bab42b56eb10fd54d6f74d381d",
+            "sha1hash": "13450c85e3ec3bb4a868d403b238d590cfe72445",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/litex-linux.vdi",
+            "subtype": "data",
+            "defaultpath": ""
+        },
+        "62": {
+            "sha256hash": "8da2608eeba58577c064d0cb9aea4ce7be00488008b7bffbc594eded6a45c040",
+            "sha1hash": "a7dd54683e067966689aff6b3b16ef093c032f2e",
+            "type": "file",
+            "defaultpath": "",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/litex-linux_placed.dcp",
+            "subtype": "data",
+            "filesize": 3019150,
+            "name": "litex-linux_placed.dcp"
+        },
+        "78": {
+            "sha256hash": "49a28e66264af48ceda54b4506fd11f53cbc3b2593c99669fbeb4b532e0c65d5",
+            "sha1hash": "0b205a62885228fea8e5ba9e52254ca28e6375e7",
+            "type": "file",
+            "defaultpath": "",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/usage_statistics_webtalk.xml",
+            "subtype": "data",
+            "filesize": 41982,
+            "name": "usage_statistics_webtalk.xml"
+        },
+        "61": {
+            "type": "file",
+            "sha256hash": "5269be30f9c5d09ab77fccc6b43e2a82db18e1ca6c52959e1d62e91ecceef479",
+            "sha1hash": "20606bbc93d5010c9d0b000555fe14fbf71a1190",
+            "subtype": "data",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/init_design.pb",
+            "defaultpath": "",
+            "filesize": 5239,
+            "name": "init_design.pb"
+        },
+        "44": {
+            "filesize": 161,
+            "name": ".place_design.begin.rst",
+            "sha256hash": "5ad965291e7e9e8ce5cdbf92968ed1a9f319b4261a553762c8ffe2568b65c22e",
+            "sha1hash": "22563e4e91da5229e824a8a3315dd0a2c13f229e",
+            "type": "file",
+            "defaultpath": "",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/.place_design.begin.rst",
+            "subtype": "data"
+        },
+        "11": {
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/vivado_51.backup.jou",
+            "subtype": "data",
+            "defaultpath": "",
+            "type": "file",
+            "sha1hash": "96b087601bf14494f9d6a0595bbd87f91a407222",
+            "sha256hash": "f46d819f16dedec29a736397031a72474a02ed6c1abaf8f14fc0b7c51c942399",
+            "name": "vivado_51.backup.jou",
+            "filesize": 747
+        },
+        "42": {
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/gen_run.xml",
+            "subtype": "data",
+            "defaultpath": "",
+            "type": "file",
+            "sha1hash": "f2b8ae0639024dcb23c835e97ffddf693d79027f",
+            "sha256hash": "ecb1b7fb2a1ab6c302c0536a5e32ee592aa497e6bb30a5071f8eb2fcd5b30ff1",
+            "name": "gen_run.xml",
+            "filesize": 5640
+        },
+        "2": {
+            "type": "file",
+            "sha256hash": "b5ae1ed3abd559cbfa3d293f6e2889bbc56de1a233f2a4230cc7722c584050cf",
+            "sha1hash": "d9831ed75d8cdecc605c5f92c1d2ec53c79f0125",
+            "subtype": "data",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/Makefile",
+            "defaultpath": "",
+            "filesize": 815,
+            "name": "Makefile"
+        },
+        "79": {
+            "filesize": 17294,
+            "name": "route_design.pb",
+            "sha256hash": "3c5ecc6560ac11de807b8c5647aa23c20839900e3ddbaf1527dd27d610b8c906",
+            "sha1hash": "3d01cb0e996e4679d24cf5b8702f1de89fe50fc7",
+            "type": "file",
+            "defaultpath": "",
+            "subtype": "data",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/route_design.pb"
+        },
+        "51": {
+            "filesize": 0,
+            "name": ".route_design.end.rst",
+            "type": "file",
+            "sha256hash": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
+            "sha1hash": "da39a3ee5e6b4b0d3255bfef95601890afd80709",
+            "subtype": "data",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/.route_design.end.rst",
+            "defaultpath": ""
+        },
+        "23": {
+            "filesize": 11390,
+            "name": "hydra-build-products",
+            "type": "file",
+            "sha256hash": "2bfea4676e397b275415a334dfe09c4ed505a12133ce3507221fd0b14668bfe0",
+            "sha1hash": "4491112ffcd4d7e1cb2738f8eae6cd77c7767fdd",
+            "subtype": "data",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/nix-support/hydra-build-products",
+            "defaultpath": ""
+        },
+        "35": {
+            "filesize": 4199145,
+            "name": "litex-linux_routed.dcp",
+            "type": "file",
+            "sha256hash": "356a3ed04e6b5c16a41b6e27e5ef9f3f9157cae790386b839fb234c4d2b7e481",
+            "sha1hash": "70d9f0dbd64800c48b2f49750e5a54d8ac92acb3",
+            "subtype": "data",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/litex-linux.runs/impl_1/litex-linux_routed.dcp",
+            "defaultpath": ""
+        }
+    },
+    "id": 1397,
+    "stoptime": 1593130245
+}
\ No newline at end of file
diff --git a/tests/sample_data/build.small.json b/tests/sample_data/build.small.json
new file mode 100644
index 0000000..1f4e920
--- /dev/null
+++ b/tests/sample_data/build.small.json
@@ -0,0 +1,15 @@
+{
+    "buildstatus": 0,
+    "buildproducts": {
+        "5": {
+            "sha256hash": "93e161b2d8641c926b304f6c7d55c4a20d18a1e449ccb6aa81f5619f239e051b",
+            "sha1hash": "dc0313c9ea558763f3e7ac6d8870d09afb0b287d",
+            "type": "file",
+            "defaultpath": "",
+            "path": "/nix/store/ajav7i3q5ii38pm24diknyccs8hn6nwd-fpga-tool-perf-baselitex-vivado-yosys-arty/meta.json",
+            "subtype": "data",
+            "filesize": 2168,
+            "name": "meta.json"
+        }
+    }
+}
\ No newline at end of file
diff --git a/tests/test_fetcher_large.py b/tests/test_fetcher_large.py
index 3716a8a..aa14b01 100644
--- a/tests/test_fetcher_large.py
+++ b/tests/test_fetcher_large.py
@@ -65,6 +65,8 @@ class TestHydraFetcherLarge(unittest.TestCase):
             evals_fn = 'tests/sample_data/evals.large.json'
             evals_url = 'https://hydra.vtr.tools/jobset/dusty/fpga-tool-perf/evals'
 
+            build_fn = 'tests/sample_data/build.large.json'
+
             meta_fn = 'tests/sample_data/meta.large.json'
 
             # setup /evals request mock
@@ -73,13 +75,21 @@ class TestHydraFetcherLarge(unittest.TestCase):
                 evals_json_encoded = f.read()
                 evals_json_decoded = json.loads(evals_json_encoded)
                 m.get(evals_url, text=evals_json_encoded)
+            
+            # read sample build response
+            build_json_encoded = None
+            with open(build_fn, "r") as f:
+                build_json_encoded = f.read()
 
-            # setup /meta.json request mock
+            # setup /build and /meta.json request mock
             with open(meta_fn, "r") as f:
                 meta_json_encoded = f.read()
                 for eval_obj in evals_json_decoded["evals"]:
                     for build_num in eval_obj["builds"]:
-                        url = f'https://hydra.vtr.tools/build/{build_num}/download/1/meta.json'
+                        # setup /build
+                        m.get(f'https://hydra.vtr.tools/build/{build_num}', text=build_json_encoded)
+                        # setup meta.json
+                        url = f'https://hydra.vtr.tools/build/{build_num}/download/5/meta.json'
                         m.get(url, text=meta_json_encoded)
 
             # run tests on different eval_num
@@ -97,8 +107,6 @@ class TestHydraFetcherLarge(unittest.TestCase):
                     expected_num_rows = len(evals_json_decoded['evals'][eval_num]['builds'])
                     self.assertEqual(len(result.index), expected_num_rows)
 
-                    # TODO: more tests on real data
-
 
 class TestJSONFetcherLarge(unittest.TestCase):
     """
diff --git a/tests/test_fetcher_small.py b/tests/test_fetcher_small.py
index 9182159..f97ba85 100644
--- a/tests/test_fetcher_small.py
+++ b/tests/test_fetcher_small.py
@@ -49,15 +49,26 @@ class TestHydraFetcherSmall(unittest.TestCase):
             evals_fn = 'tests/sample_data/evals.small.json'
             evals_url = 'https://hydra.vtr.tools/jobset/dusty/fpga-tool-perf/evals'
 
-            # load sample json data
+            build_fn = 'tests/sample_data/build.small.json'
+
+            # setup /evals request mock
             with open(evals_fn, "r") as f:
                 json_data = f.read()
-                m.get(evals_url, text=json_data) # setup /evals request mock
+                m.get(evals_url, text=json_data) 
+
+            # setup /build and /meta.json request mock
+            with open(build_fn, "r") as f:
+                json_data = f.read()
 
                 for build_num in range(12):
-                    url = f'https://hydra.vtr.tools/build/{build_num}/download/1/meta.json'
+                    # /build/:buildid
+                    build_url = f'https://hydra.vtr.tools/build/{build_num}'
+                    m.get(build_url, text=json_data)
+                    
+                    # /meta.json
+                    meta_url = f'https://hydra.vtr.tools/build/{build_num}/download/5/meta.json'
                     payload = {"build_num": build_num}
-                    m.get(url, json=payload) # setup /meta.json request mock
+                    m.get(meta_url, json=payload) # setup /meta.json request mock
 
             # run tests on different eval_num
             for eval_num in range(0, 3):
@@ -87,15 +98,26 @@ class TestHydraFetcherSmall(unittest.TestCase):
             evals_fn = 'tests/sample_data/evals.small.json'
             evals_url = 'https://hydra.vtr.tools/jobset/dusty/fpga-tool-perf/evals'
 
-            # load sample json data
+            build_fn = 'tests/sample_data/build.small.json'
+
+            # setup /evals request mock
             with open(evals_fn, "r") as f:
                 json_data = f.read()
-                m.get(evals_url, text=json_data) # setup /evals request mock
+                m.get(evals_url, text=json_data) 
 
-                for build_num in range(4):
-                    url = f'https://hydra.vtr.tools/build/{build_num}/download/1/meta.json'
-                    payload = {"build_num": build_num, "extra": 1}
-                    m.get(url, json=payload) # setup /meta.json request mock
+            # setup /build and /meta.json request mock
+            with open(build_fn, "r") as f:
+                json_data = f.read()
+
+                for build_num in range(12):
+                    # /build/:buildid
+                    build_url = f'https://hydra.vtr.tools/build/{build_num}'
+                    m.get(build_url, text=json_data)
+                    
+                    # /meta.json
+                    meta_url = f'https://hydra.vtr.tools/build/{build_num}/download/5/meta.json'
+                    payload = {"build_num": build_num}
+                    m.get(meta_url, json=payload) # setup /meta.json request mock
 
             # test exclusion
             hf1 = HydraFetcher(
@@ -135,13 +157,24 @@ class TestHydraFetcherSmall(unittest.TestCase):
             evals_fn = 'tests/sample_data/evals.small.json'
             evals_url = 'https://hydra.vtr.tools/jobset/dusty/fpga-tool-perf/evals'
 
-            # load sample json data
+            build_fn = 'tests/sample_data/build.small.json'
+
+            # setup /evals request mock
             with open(evals_fn, "r") as f:
                 json_data = f.read()
-                m.get(evals_url, text=json_data) # setup /evals request mock
+                m.get(evals_url, text=json_data)
+
+            # setup /build and /meta.json request mock
+            with open(build_fn, "r") as f:
+                json_data = f.read()
 
                 for build_num in range(4):
-                    url = f'https://hydra.vtr.tools/build/{build_num}/download/1/meta.json'
+                    # /build/:buildid0
+                    build_url = f'https://hydra.vtr.tools/build/{build_num}'
+                    m.get(build_url, text=json_data)
+
+                    # /meta.json
+                    url = f'https://hydra.vtr.tools/build/{build_num}/download/5/meta.json'
                     payload = {
                         "max_freq": {
                             "clk": {

HydraFetcher unable to fetch meta.json of older builds
The current hydrafetcher assumes that `meta.json` is the only build product when fetching it from Hydra. Thus, it fetches the `meta.json` file from the following link:

```python
"https://hydra.vtr.tools/build/{build_num}/download/1/meta.json"
```

This assumption does not hold for older builds ([example](https://hydra.vtr.tools/build/1382)), since the `1` in the path could actually be a different number (in the example, `8`). 

This can be resolved by first fetching the build info using the [Hydra API](https://hydra.nixos.org/build/124511651/download/1/hydra/#idm140737319750000) and searching for the file named `meta.json`.
tests/test_fetcher_large.py::TestHydraFetcherLarge::test_hydrafetcher_get_evaluation tests/test_fetcher_small.py::TestHydraFetcherSmall::test_hydrafetcher_get_evaluation_eval_num tests/test_fetcher_small.py::TestHydraFetcherSmall::test_hydrafetcher_get_evaluation_mapping tests/test_fetcher_small.py::TestHydraFetcherSmall::test_hydrafetcher_hydra_clock_names
tests/test_fetcher_large.py::TestHydraFetcherLarge::test_hydrafetcher_init tests/test_fetcher_large.py::TestJSONFetcherLarge::test_jsonfetcher_get_evaluation tests/test_fetcher_large.py::TestJSONFetcherLarge::test_jsonfetcher_init tests/test_fetcher_small.py::TestHydraFetcherSmall::test_hydrafetcher_init tests/test_fetcher_small.py::TestJSONFetcherSmall::test_jsonfetcher_get_evaluation tests/test_fetcher_small.py::TestJSONFetcherSmall::test_jsonfetcher_get_evaluation_mapping tests/test_fetcher_small.py::TestJSONFetcherSmall::test_jsonfetcher_init