diff --git a/Pipfile b/Pipfile
index 3574cdd..3a5d0c1 100644
--- a/Pipfile
+++ b/Pipfile
@@ -5,16 +5,20 @@ name = "pypi"
 
 [packages]
 click = "*"
+docker = "*"
+pygit2 = "*"
+types-docker = "*"
+types-pygit2 = "*"
 
 [dev-packages]
 black = "*"
 coveralls = "*"
+ipython = "*"
 mypy = "*"
 pre-commit = "*"
 pytest = "*"
-ruff = "*"
-ipython = "*"
 pytest-freezegun = "*"
+ruff = "*"
 setuptools = "*"
 
 [requires]
diff --git a/Pipfile.lock b/Pipfile.lock
index 187618c..e70102f 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "041643c4824c1f8a72d3f4e546ff7cdfaf0e5a74d2c73c8c450da91e83697f84"
+            "sha256": "35342439f8899b8dbfc77376e1edb23e57e5054972c8ca5e491b2c17dde58a19"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -16,6 +16,183 @@
         ]
     },
     "default": {
+        "certifi": {
+            "hashes": [
+                "sha256:922820b53db7a7257ffbda3f597266d435245903d80737e34f8a45ff3e3230d8",
+                "sha256:bec941d2aa8195e248a60b31ff9f0558284cf01a52591ceda73ea9afffd69fd9"
+            ],
+            "markers": "python_version >= '3.6'",
+            "version": "==2024.8.30"
+        },
+        "cffi": {
+            "hashes": [
+                "sha256:011aff3524d578a9412c8b3cfaa50f2c0bd78e03eb7af7aa5e0df59b158efb2f",
+                "sha256:0a048d4f6630113e54bb4b77e315e1ba32a5a31512c31a273807d0027a7e69ab",
+                "sha256:0bb15e7acf8ab35ca8b24b90af52c8b391690ef5c4aec3d31f38f0d37d2cc499",
+                "sha256:0d46ee4764b88b91f16661a8befc6bfb24806d885e27436fdc292ed7e6f6d058",
+                "sha256:0e60821d312f99d3e1569202518dddf10ae547e799d75aef3bca3a2d9e8ee693",
+                "sha256:0fdacad9e0d9fc23e519efd5ea24a70348305e8d7d85ecbb1a5fa66dc834e7fb",
+                "sha256:14b9cbc8f7ac98a739558eb86fabc283d4d564dafed50216e7f7ee62d0d25377",
+                "sha256:17c6d6d3260c7f2d94f657e6872591fe8733872a86ed1345bda872cfc8c74885",
+                "sha256:1a2ddbac59dc3716bc79f27906c010406155031a1c801410f1bafff17ea304d2",
+                "sha256:2404f3de742f47cb62d023f0ba7c5a916c9c653d5b368cc966382ae4e57da401",
+                "sha256:24658baf6224d8f280e827f0a50c46ad819ec8ba380a42448e24459daf809cf4",
+                "sha256:24aa705a5f5bd3a8bcfa4d123f03413de5d86e497435693b638cbffb7d5d8a1b",
+                "sha256:2770bb0d5e3cc0e31e7318db06efcbcdb7b31bcb1a70086d3177692a02256f59",
+                "sha256:331ad15c39c9fe9186ceaf87203a9ecf5ae0ba2538c9e898e3a6967e8ad3db6f",
+                "sha256:3aa9d43b02a0c681f0bfbc12d476d47b2b2b6a3f9287f11ee42989a268a1833c",
+                "sha256:41f4915e09218744d8bae14759f983e466ab69b178de38066f7579892ff2a555",
+                "sha256:4304d4416ff032ed50ad6bb87416d802e67139e31c0bde4628f36a47a3164bfa",
+                "sha256:435a22d00ec7d7ea533db494da8581b05977f9c37338c80bc86314bec2619424",
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+            ],
+            "markers": "python_version >= '3.8'",
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+        "charset-normalizer": {
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+            "version": "==3.3.2"
+        },
         "click": {
             "hashes": [
                 "sha256:ae74fb96c20a0277a1d615f1e4d73c8414f5a98db8b799a7931d1582f3390c28",
@@ -24,6 +201,125 @@
             "index": "pypi",
             "markers": "python_version >= '3.7'",
             "version": "==8.1.7"
+        },
+        "docker": {
+            "hashes": [
+                "sha256:ad8c70e6e3f8926cb8a92619b832b4ea5299e2831c14284663184e200546fa6c",
+                "sha256:c96b93b7f0a746f9e77d325bcfb87422a3d8bd4f03136ae8a85b37f1898d5fc0"
+            ],
+            "index": "pypi",
+            "markers": "python_version >= '3.8'",
+            "version": "==7.1.0"
+        },
+        "idna": {
+            "hashes": [
+                "sha256:050b4e5baadcd44d760cedbd2b8e639f2ff89bbc7a5730fcc662954303377aac",
+                "sha256:d838c2c0ed6fced7693d5e8ab8e734d5f8fda53a039c0164afb0b82e771e3603"
+            ],
+            "markers": "python_version >= '3.6'",
+            "version": "==3.8"
+        },
+        "pycparser": {
+            "hashes": [
+                "sha256:491c8be9c040f5390f5bf44a5b07752bd07f56edf992381b05c701439eec10f6",
+                "sha256:c3702b6d3dd8c7abc1afa565d7e63d53a1d0bd86cdc24edd75470f4de499cfcc"
+            ],
+            "markers": "python_version >= '3.8'",
+            "version": "==2.22"
+        },
+        "pygit2": {
+            "hashes": [
+                "sha256:0367f94cb4413bc668bcf1fd7f941bb1c1f214545d47b964442857de234799cf",
+                "sha256:06d42733a767bfe9245df15f4585823243f0845fab8c81a2c680a0e49a9cb012",
+                "sha256:0bcce4cfdabc05a2a35d709513863bcce8c929492ae7c0d56f045838bd57ea8f",
+                "sha256:167c23272b225ddd3be1e794bd8085b3c4e394cbdb70a1be278ab32e228ccedc",
+                "sha256:1b269b504d47b50e4ed7fe21326c0d046a0ab8b8897db059bdc208e2210e3070",
+                "sha256:1d622d0f97a34982973f9885d145b1176e912ea9f191e1c95233a6175a47fa28",
+                "sha256:23afb0a683285c02ff84f7ac574c39fec52b66032f92e8ca038cc81cfc68037a",
+                "sha256:2996180cbe7653e98839eb3afa5c040081f6e1cc835824769efe84c76ea2caf8",
+                "sha256:4072b80018b8c0e1743e9803b717e026d3017df291e2d81f7b869ebe18b01286",
+                "sha256:435b90bfddae32c6a00b48ff7da26564027dccd84e49866f48e659c9f3de6772",
+                "sha256:4cb1c22351c43c3cc96e842f31bd9b331a0ea7cb62aa8cf32433d45eebde0b1c",
+                "sha256:4d5839566491378b84dec1c35ffdb28b70fb6cd4ea2604a59052c4e4cf1c9da1",
+                "sha256:511b082c6d6c7b01cb8d49e108d066a1b5211c7364a0d8e7178809b8a304ac4b",
+                "sha256:5214ac7844e10cc279d746b588b5e6c6d73520d36d1361fe18e6e9d9c86ad357",
+                "sha256:5e1d338c88e1425e3dc09a3147b42683205b2dbb00b14c0ce80123f059e51de8",
+                "sha256:709f5d9592764ec5d6652e73882997f38cc8e6c7b495792698ecaca3e6a26088",
+                "sha256:738be5d3a3e7775571b14d3d110cfab10260f846078c402c041486f3582dbfbe",
+                "sha256:86ad7c8ec6fd545a65952066a693cb2ee4f26a0f6a8577e866f6742fc7eddb11",
+                "sha256:a0c6d5df5029f4cb25b0d7d8f04cb39691c107eedee1f157ee25be3b0b9df7c6",
+                "sha256:a5a4d288a7b0006f78e02e2c539e6218b254a8228e754051fd5532595fbf9a4c",
+                "sha256:b08d62ad424ba04ed7572d0a927f43cdccbf20c7c88250232a477fcb0a901701",
+                "sha256:bb60dbb93135e36b86dd8012ee707ea3b68c02869b6d10f23cfb86e10798bf6f",
+                "sha256:cd2861963bb904bd41162e9148676990f147da7dbc535ceea070ab371012bfed",
+                "sha256:e0a32a3c7742db8d925712344eaeb205c0a6076779035fea24574ea2507ba34c",
+                "sha256:e1fe8b85053d9713043c81eccc74132f9e5b603f209e80733d7955eafd22eb9d",
+                "sha256:e9c417d90915e59fd1a5a6532d47c8f2da5f97fd769e5ae9f5b9edec3a7bc669",
+                "sha256:f2418b29da5bad17e13674041790f2eda399c92d2e61c1be08f58df18dc99b56",
+                "sha256:f7d5329fd0658644de38bdb0ad8fad7877803f92a108acfc813525cbb5bd75a1",
+                "sha256:fb6abaef13b304a009584a0561acec21d1df4e57899fc85e8af4533352123c5e"
+            ],
+            "index": "pypi",
+            "markers": "python_version >= '3.9'",
+            "version": "==1.15.1"
+        },
+        "requests": {
+            "hashes": [
+                "sha256:55365417734eb18255590a9ff9eb97e9e1da868d4ccd6402399eaf68af20a760",
+                "sha256:70761cfe03c773ceb22aa2f671b4757976145175cdfca038c02654d061d6dcc6"
+            ],
+            "markers": "python_version >= '3.8'",
+            "version": "==2.32.3"
+        },
+        "types-cffi": {
+            "hashes": [
+                "sha256:a363e5ea54a4eb6a4a105d800685fde596bc318089b025b27dee09849fe41ff0",
+                "sha256:b8b20d23a2b89cfed5f8c5bc53b0cb8677c3aac6d970dbc771e28b9c698f5dee"
+            ],
+            "markers": "python_version >= '3.8'",
+            "version": "==1.16.0.20240331"
+        },
+        "types-docker": {
+            "hashes": [
+                "sha256:3b0a02da44cffef176dfc4f8b2c4a502ee66e83d79c8527c0cf5806eb599cfac",
+                "sha256:e71067745f0100bcc2c1a2fc794ea15204c916430b09e61bd6bddf1bf56e4343"
+            ],
+            "index": "pypi",
+            "markers": "python_version >= '3.8'",
+            "version": "==7.1.0.20240827"
+        },
+        "types-pygit2": {
+            "hashes": [
+                "sha256:1aca0709cdca3c0f531e7b35ddd37425bf5da1bfc27482fe794f3118251bf9aa",
+                "sha256:9824a56d6671e25e287a3c7937d76bb52afad54618532625cacf6d0408081211"
+            ],
+            "index": "pypi",
+            "markers": "python_version >= '3.8'",
+            "version": "==1.15.0.20240822"
+        },
+        "types-requests": {
+            "hashes": [
+                "sha256:90c079ff05e549f6bf50e02e910210b98b8ff1ebdd18e19c873cd237737c1358",
+                "sha256:f754283e152c752e46e70942fa2a146b5bc70393522257bb85bd1ef7e019dcc3"
+            ],
+            "markers": "python_version >= '3.8'",
+            "version": "==2.32.0.20240712"
+        },
+        "types-setuptools": {
+            "hashes": [
+                "sha256:4d9d18ea9214828d695a384633130009f5dee2681a157ee873d3680b62931590",
+                "sha256:8b4a544cc91d42a019dc1e41fd397608b4bc7e20c7d7d5bc326589ffd9e8f8a1"
+            ],
+            "markers": "python_version >= '3.8'",
+            "version": "==74.0.0.20240831"
+        },
+        "urllib3": {
+            "hashes": [
+                "sha256:a448b2f64d686155468037e1ace9f2d2199776e17f0a46610480d311f73e3472",
+                "sha256:dd505485549a7a552833da5e6063639d0d177c04f23bc3864e41e5dc5f612168"
+            ],
+            "markers": "python_version >= '3.8'",
+            "version": "==2.2.2"
         }
     },
     "develop": {
@@ -65,11 +361,11 @@
         },
         "certifi": {
             "hashes": [
-                "sha256:5a1e7645bc0ec61a09e26c36f6106dd4cf40c6db3a1fb6352b0244e7fb057c7b",
-                "sha256:c198e21b1289c2ab85ee4e67bb4b4ef3ead0892059901a8d5b622f24a1101e90"
+                "sha256:922820b53db7a7257ffbda3f597266d435245903d80737e34f8a45ff3e3230d8",
+                "sha256:bec941d2aa8195e248a60b31ff9f0558284cf01a52591ceda73ea9afffd69fd9"
             ],
             "markers": "python_version >= '3.6'",
-            "version": "==2024.7.4"
+            "version": "==2024.8.30"
         },
         "cfgv": {
             "hashes": [
@@ -297,11 +593,11 @@
         },
         "executing": {
             "hashes": [
-                "sha256:35afe2ce3affba8ee97f2d69927fa823b08b472b7b994e36a52a964b93d16147",
-                "sha256:eac49ca94516ccc753f9fb5ce82603156e590b27525a8bc32cce8ae302eb61bc"
+                "sha256:8d63781349375b5ebccc3142f4b30350c0cd9c79f921cde38be2be4637e98eaf",
+                "sha256:8ea27ddd260da8150fa5a708269c4a10e76161e2496ec3e587da9e3c0fe4b9ab"
             ],
-            "markers": "python_version >= '3.5'",
-            "version": "==2.0.1"
+            "markers": "python_version >= '3.8'",
+            "version": "==2.1.0"
         },
         "filelock": {
             "hashes": [
@@ -345,12 +641,12 @@
         },
         "ipython": {
             "hashes": [
-                "sha256:1cec0fbba8404af13facebe83d04436a7434c7400e59f47acf467c64abd0956c",
-                "sha256:e6b347c27bdf9c32ee9d31ae85defc525755a1869f14057e900675b9e8d6e6ff"
+                "sha256:0b99a2dc9f15fd68692e898e5568725c6d49c527d36a9fb5960ffbdeaa82ff7e",
+                "sha256:f68b3cb8bde357a5d7adc9598d57e22a45dfbea19eb6b98286fa3b288c9cd55c"
             ],
             "index": "pypi",
             "markers": "python_version >= '3.10'",
-            "version": "==8.26.0"
+            "version": "==8.27.0"
         },
         "jedi": {
             "hashes": [
@@ -599,37 +895,37 @@
         },
         "ruff": {
             "hashes": [
-                "sha256:094600ee88cda325988d3f54e3588c46de5c18dae09d683ace278b11f9d4d534",
-                "sha256:1175d39faadd9a50718f478d23bfc1d4da5743f1ab56af81a2b6caf0a2394f23",
-                "sha256:17002fe241e76544448a8e1e6118abecbe8cd10cf68fde635dad480dba594570",
-                "sha256:239ee6beb9e91feb8e0ec384204a763f36cb53fb895a1a364618c6abb076b3be",
-                "sha256:279d5f7d86696df5f9549b56b9b6a7f6c72961b619022b5b7999b15db392a4da",
-                "sha256:2aed7e243be68487aa8982e91c6e260982d00da3f38955873aecd5a9204b1d66",
-                "sha256:316d418fe258c036ba05fbf7dfc1f7d3d4096db63431546163b472285668132b",
-                "sha256:3dbeac76ed13456f8158b8f4fe087bf87882e645c8e8b606dd17b0b66c2c1158",
-                "sha256:5b939f9c86d51635fe486585389f54582f0d65b8238e08c327c1534844b3bb9a",
-                "sha256:5c8cbc6252deb3ea840ad6a20b0f8583caab0c5ef4f9cca21adc5a92b8f79f3c",
-                "sha256:7438a7288f9d67ed3c8ce4d059e67f7ed65e9fe3aa2ab6f5b4b3610e57e3cb56",
-                "sha256:7db6880c53c56addb8638fe444818183385ec85eeada1d48fc5abe045301b2f1",
-                "sha256:a8f310d63af08f583363dfb844ba8f9417b558199c58a5999215082036d795a1",
-                "sha256:d0d62ca91219f906caf9b187dea50d17353f15ec9bb15aae4a606cd697b49b4c",
-                "sha256:d371f7fc9cec83497fe7cf5eaf5b76e22a8efce463de5f775a1826197feb9df8",
-                "sha256:d72b8b3abf8a2d51b7b9944a41307d2f442558ccb3859bbd87e6ae9be1694a5d",
-                "sha256:d9f3469c7dd43cd22eb1c3fc16926fb8258d50cb1b216658a07be95dd117b0f2",
-                "sha256:f28fcd2cd0e02bdf739297516d5643a945cc7caf09bd9bcb4d932540a5ea4fa9"
+                "sha256:14a9528a8b70ccc7a847637c29e56fd1f9183a9db743bbc5b8e0c4ad60592a82",
+                "sha256:183b99e9edd1ef63be34a3b51fee0a9f4ab95add123dbf89a71f7b1f0c991983",
+                "sha256:34e2824a13bb8c668c71c1760a6ac7d795ccbd8d38ff4a0d8471fdb15de910b1",
+                "sha256:3b061e49b5cf3a297b4d1c27ac5587954ccb4ff601160d3d6b2f70b1622194dc",
+                "sha256:42844ff678f9b976366b262fa2d1d1a3fe76f6e145bd92c84e27d172e3c34500",
+                "sha256:47021dff5445d549be954eb275156dfd7c37222acc1e8014311badcb9b4ec8c1",
+                "sha256:500f166d03fc6d0e61c8e40a3ff853fa8a43d938f5d14c183c612df1b0d6c58a",
+                "sha256:65a533235ed55f767d1fc62193a21cbf9e3329cf26d427b800fdeacfb77d296f",
+                "sha256:70452a10eb2d66549de8e75f89ae82462159855e983ddff91bc0bce6511d0470",
+                "sha256:746af39356fee2b89aada06c7376e1aa274a23493d7016059c3a72e3b296befb",
+                "sha256:7a62d3b5b0d7f9143d94893f8ba43aa5a5c51a0ffc4a401aa97a81ed76930521",
+                "sha256:7d7bd20dc07cebd68cc8bc7b3f5ada6d637f42d947c85264f94b0d1cd9d87384",
+                "sha256:97f58fda4e309382ad30ede7f30e2791d70dd29ea17f41970119f55bdb7a45c3",
+                "sha256:bddfbb8d63c460f4b4128b6a506e7052bad4d6f3ff607ebbb41b0aa19c2770d1",
+                "sha256:ced3eeb44df75353e08ab3b6a9e113b5f3f996bea48d4f7c027bc528ba87b672",
+                "sha256:d2e2c23cef30dc3cbe9cc5d04f2899e7f5e478c40d2e0a633513ad081f7361b5",
+                "sha256:d8a136aa7d228975a6aee3dd8bea9b28e2b43e9444aa678fb62aeb1956ff2351",
+                "sha256:f92fe93bc72e262b7b3f2bba9879897e2d58a989b4714ba6a5a7273e842ad2f8"
             ],
             "index": "pypi",
             "markers": "python_version >= '3.7'",
-            "version": "==0.6.2"
+            "version": "==0.6.3"
         },
         "setuptools": {
             "hashes": [
-                "sha256:0274581a0037b638b9fc1c6883cc71c0210865aaa76073f7882376b641b84e8f",
-                "sha256:a85e96b8be2b906f3e3e789adec6a9323abf79758ecfa3065bd740d81158b11e"
+                "sha256:2353af060c06388be1cecbf5953dcdb1f38362f87a2356c480b6b4d5fcfc8847",
+                "sha256:fc91b5f89e392ef5b77fe143b17e32f65d3024744fba66dc3afe07201684d766"
             ],
             "index": "pypi",
             "markers": "python_version >= '3.8'",
-            "version": "==74.0.0"
+            "version": "==74.1.1"
         },
         "six": {
             "hashes": [
diff --git a/abdiff/core/__init__.py b/abdiff/core/__init__.py
index 75e8cc1..3e879cc 100644
--- a/abdiff/core/__init__.py
+++ b/abdiff/core/__init__.py
@@ -3,7 +3,8 @@
 All primary functions used by CLI are importable from here.
 """
 
+from abdiff.core.build_ab_images import build_ab_images
 from abdiff.core.init_job import init_job
 from abdiff.core.init_run import init_run
 
-__all__ = ["init_job", "init_run"]
+__all__ = ["init_job", "init_run", "build_ab_images"]
diff --git a/abdiff/core/build_ab_images.py b/abdiff/core/build_ab_images.py
index 70d6bf1..dbb80fb 100644
--- a/abdiff/core/build_ab_images.py
+++ b/abdiff/core/build_ab_images.py
@@ -1 +1,97 @@
-"""abdiff.core.build_ab_images"""
+import logging
+import tempfile
+
+import docker
+import docker.models
+import docker.models.images
+from pygit2 import clone_repository
+from pygit2.enums import ResetMode
+
+from abdiff.core.utils import update_or_create_job_json
+
+logger = logging.getLogger(__name__)
+
+
+def build_ab_images(
+    job_directory: str,
+    commit_sha_a: str,
+    commit_sha_b: str,
+    docker_client: docker.client.DockerClient | None = None,
+) -> tuple[str, str]:
+    """Build Docker images based on 2 commit SHAs.
+
+    Args:
+        job_directory: The directory containing all files related to a job.
+        commit_sha_a: The SHA of the first commit for comparison.
+        commit_sha_b: The SHA of the second commit for comparison.
+        docker_client: A configured Docker client.
+    """
+    if not docker_client:
+        docker_client = docker.from_env()
+
+    image_tags = []
+    for commit_sha in [commit_sha_a, commit_sha_b]:
+        logger.debug(f"Processing commit: {commit_sha}")
+        image_tag = f"transmogrifier-{job_directory.split("/")[-1]}-{commit_sha}:latest"
+        if docker_image_exists(docker_client, image_tag):
+            logger.debug(f"Docker image already exists with tag: {image_tag}")
+            image_tags.append(image_tag)
+        else:
+            image = build_image(job_directory, commit_sha, docker_client)
+            image_tags.append(image.tags[0])
+        logger.debug(f"Finished processing commit: {commit_sha}")
+
+    images_data = {"image_tag_a": image_tags[0], "image_tag_b": image_tags[1]}
+    update_or_create_job_json(job_directory, images_data)
+    return (image_tags[0], image_tags[1])
+
+
+def docker_image_exists(
+    docker_client: docker.client.DockerClient, image_tag: str
+) -> bool:
+    """Check if Docker image already exists with a certain name.
+
+    Args:
+        docker_client: A configured Docker client.
+        image_tag: The tag of the Docker image to be created.
+    """
+    return image_tag in [
+        image_tag for image in docker_client.images.list() for image_tag in image.tags
+    ]
+
+
+def build_image(
+    job_directory: str,
+    commit_sha: str,
+    docker_client: docker.client.DockerClient,
+) -> docker.models.images.Image:
+    """Clone repo and build Docker image.
+
+    Args:
+        job_directory: The directory containing all files related to a job.
+        commit_sha: The SHA of the commit.
+        docker_client: A configured Docker client.
+    """
+    with tempfile.TemporaryDirectory() as clone_directory:
+        image_tag = f"transmogrifier-{job_directory.split("/")[-1]}-{commit_sha}"
+        clone_repo_and_reset_to_commit(clone_directory, commit_sha)
+        image, _ = docker_client.images.build(path=clone_directory, tag=image_tag)
+        logger.debug(f"Docker image created with tag: {image}")
+        return image
+
+
+def clone_repo_and_reset_to_commit(clone_directory: str, commit_sha: str) -> None:
+    """Clone GitHub repo and reset to a specified commit.
+
+    Args:
+        clone_directory: The directory for the cloned repo.
+        commit_sha: The SHA of a repo commit.
+    """
+    logger.debug(f"Cloning repo to: {clone_directory}")
+    repository = clone_repository(
+        "https://github.com/MITLibraries/transmogrifier.git",
+        clone_directory,
+    )
+    logger.debug(f"Cloned repo to: {clone_directory}")
+    repository.reset(commit_sha, ResetMode.HARD)
+    logger.debug(f"Cloned repo reset to commit: {commit_sha}")
diff --git a/tests/conftest.py b/tests/conftest.py
index d4d075b..14d8880 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,3 +1,5 @@
+from unittest.mock import MagicMock
+
 import pytest
 from click.testing import CliRunner
 
@@ -7,7 +9,6 @@
 @pytest.fixture(autouse=True)
 def _test_env(monkeypatch, tmp_path):
     monkeypatch.setenv("WORKSPACE", "test")
-    monkeypatch.setenv("ROOT_WORKING_DIRECTORY", str(tmp_path / "output"))
 
 
 @pytest.fixture
@@ -28,3 +29,19 @@ def example_job_directory():
 @pytest.fixture
 def job(job_directory):
     return init_job(job_directory)
+
+
+@pytest.fixture
+def mocked_docker_client():
+    docker_client = MagicMock()
+    docker_images = []
+    for image_tag in [
+        "transmogrifier-example-job-1-abc123:latest",
+        "transmogrifier-example-job-1-def456:latest",
+    ]:
+        docker_image = MagicMock()
+        docker_image.tags = [image_tag]
+        docker_images.append((docker_image, ""))
+    docker_client.images.build.side_effect = docker_images
+    docker_client.images.list.return_value = [docker_image]
+    return docker_client
diff --git a/tests/test_build_ab_images.py b/tests/test_build_ab_images.py
new file mode 100644
index 0000000..9360eac
--- /dev/null
+++ b/tests/test_build_ab_images.py
@@ -0,0 +1,68 @@
+import os
+from unittest.mock import patch
+
+from abdiff.core.build_ab_images import (
+    build_ab_images,
+    build_image,
+    clone_repo_and_reset_to_commit,
+    docker_image_exists,
+)
+from abdiff.core.utils import read_job_json
+
+
+@patch("abdiff.core.build_ab_images.clone_repository")
+def test_build_ab_images_success(mocked_clone, job_directory, mocked_docker_client):
+    side_effect = os.makedirs(job_directory + "/clone")
+    mocked_clone.side_effect = side_effect
+
+    images = build_ab_images(
+        job_directory,
+        "abc123",
+        "def456",
+        mocked_docker_client,
+    )
+    assert images[0] == "transmogrifier-example-job-1-abc123:latest"
+    assert images[1] == "transmogrifier-example-job-1-def456:latest"
+    assert read_job_json(job_directory) == {
+        "image_tag_a": "transmogrifier-example-job-1-abc123:latest",
+        "image_tag_b": "transmogrifier-example-job-1-def456:latest",
+    }
+
+
+def test_docker_image_exists_returns_true(mocked_docker_client):
+    assert (
+        docker_image_exists(
+            mocked_docker_client, "transmogrifier-example-job-1-def456:latest"
+        )
+        is True
+    )
+
+
+def test_docker_image_exists_returns_false(mocked_docker_client):
+    assert (
+        docker_image_exists(
+            mocked_docker_client, "transmogrifier-example-job-1-abc123:latest"
+        )
+        is False
+    )
+
+
+@patch("abdiff.core.build_ab_images.clone_repository")
+def test_build_image_success(mocked_clone, job_directory, mocked_docker_client):
+    image = build_image(
+        job_directory,
+        "abc123",
+        mocked_docker_client,
+    )
+    assert image.tags[0] == "transmogrifier-example-job-1-abc123:latest"
+
+
+@patch("abdiff.core.build_ab_images.clone_repository")
+def test_clone_repo_and_reset_to_commit_success(mocked_clone, job_directory):
+    clone_directory = job_directory + "/clone"
+    assert not os.path.exists(clone_directory)
+    side_effect = os.makedirs(clone_directory)
+    mocked_clone.side_effect = side_effect
+
+    clone_repo_and_reset_to_commit(clone_directory, "abc123")
+    assert os.path.exists(clone_directory)