diff --git a/conda-lock.yml b/conda-lock.yml
index daa2f5c..b3f6a42 100644
--- a/conda-lock.yml
+++ b/conda-lock.yml
@@ -13,10 +13,10 @@
 version: 1
 metadata:
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-    win-64: 82b1ebbbd4a2da49c5e2cdd31da8891b4930551f67e7f539472b347c6040b569
+    linux-64: 2f658f0ec6bc1914ca0312e3c940f97ce2d1ff874a2d6648ffa66e50ef1d1390
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   channels:
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     used_env_vars: []
@@ -245,10 +245,10 @@ package:
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   dependencies:
     libgcc-ng: '>=12'
-  url: https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.20.1-hd590300_0.conda
+  url: https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.20.1-hd590300_1.conda
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 - name: fmt
@@ -1631,15 +1631,15 @@ package:
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+  version: 3.3.1
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   dependencies:
     python: '>=3.7'
-  url: https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.3.0-pyhd8ed1ab_0.conda
+  url: https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.3.1-pyhd8ed1ab_0.conda
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 - name: click
@@ -1820,15 +1820,15 @@ package:
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   optional: false
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+  version: 2023.10.0
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     python: '>=3.8'
-  url: https://conda.anaconda.org/conda-forge/noarch/fsspec-2023.9.2-pyh1a96a4e_0.conda
+  url: https://conda.anaconda.org/conda-forge/noarch/fsspec-2023.10.0-pyhca7485f_0.conda
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   category: main
   optional: false
+- name: coverage
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+  manager: conda
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+  dependencies:
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+    python: '>=3.10,<3.11.0a0'
+    python_abi: 3.10.*
+    tomli: ''
+  url: https://conda.anaconda.org/conda-forge/linux-64/coverage-7.3.2-py310h2372a71_0.conda
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   category: main
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+- name: pytest-cov
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+  manager: conda
+  platform: linux-64
+  dependencies:
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+    pytest: '>=4.6'
+    python: '>=3.7'
+    toml: ''
+  url: https://conda.anaconda.org/conda-forge/noarch/pytest-cov-4.1.0-pyhd8ed1ab_0.conda
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 - name: virtualenv
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+  version: 20.24.6
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     python: '>=3.8'
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+  url: https://conda.anaconda.org/conda-forge/noarch/virtualenv-20.24.6-pyhd8ed1ab_0.conda
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     virtualenv: '>=20.0.26'
-  url: https://conda.anaconda.org/conda-forge/noarch/conda-lock-2.4.0-pyhd8ed1ab_0.conda
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+  version: 2023.10.0
   manager: conda
   platform: linux-64
   dependencies:
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     python: '>=3.8'
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   dependencies: {}
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+  version: 3.3.1
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+  version: 2023.10.0
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+    python: '>=3.7'
+    pytest: '>=4.6'
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-  url: https://conda.anaconda.org/conda-forge/noarch/virtualenv-20.24.4-pyhd8ed1ab_0.conda
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   dependencies:
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@@ -10650,15 +10709,15 @@ package:
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   dependencies:
     python: '>=3.8'
-  url: https://conda.anaconda.org/conda-forge/noarch/fsspec-2023.9.2-pyh1a96a4e_0.conda
+  url: https://conda.anaconda.org/conda-forge/noarch/fsspec-2023.10.0-pyhca7485f_0.conda
   hash:
-    md5: 9d15cd3a0e944594ab528da37dc72ecc
-    sha256: d95d11d1f501cb69528bb2b620b728f12caf872cb23837bc9bdd6ef405b4ecfb
+    md5: 5b86cf1ceaaa9be2ec4627377e538db1
+    sha256: 1bbdfadb93cc768252fd207dca406cde928f9a81ff985ea1760b6539c55923e6
   category: main
   optional: false
 - name: glob2
@@ -11753,6 +11812,20 @@ package:
     sha256: ee523a09a70c4ef71418b12ea3086169b69969dbfa382791dbde5e1a00e41728
   category: main
   optional: false
+- name: coverage
+  version: 7.3.2
+  manager: conda
+  platform: osx-arm64
+  dependencies:
+    python: '>=3.10,<3.11.0a0'
+    python_abi: 3.10.*
+    tomli: ''
+  url: https://conda.anaconda.org/conda-forge/osx-arm64/coverage-7.3.2-py310h2aa6e3c_0.conda
+  hash:
+    md5: 8727260854f3a05e8974a871f5d4b267
+    sha256: 62b98caf4d36918cf8b503b052248d89ccfda76e39bd3e5cab6e97d315602ad6
+  category: main
+  optional: false
 - name: fonttools
   version: 4.43.1
   manager: conda
@@ -12550,6 +12623,21 @@ package:
     sha256: 6360cfc9b4e9b2286750cda4bb53861babbebe5c7323b9cf12225a08f4b9a15f
   category: main
   optional: false
+- name: pytest-cov
+  version: 4.1.0
+  manager: conda
+  platform: osx-arm64
+  dependencies:
+    toml: ''
+    python: '>=3.7'
+    pytest: '>=4.6'
+    coverage: '>=5.2.1'
+  url: https://conda.anaconda.org/conda-forge/noarch/pytest-cov-4.1.0-pyhd8ed1ab_0.conda
+  hash:
+    md5: 06eb685a3a0b146347a58dda979485da
+    sha256: f07d3b44cabbed7843de654c4a6990a08475ce3b708bb735c7da9842614586f2
+  category: main
+  optional: false
 - name: requests
   version: 2.31.0
   manager: conda
@@ -12916,7 +13004,7 @@ package:
   category: main
   optional: false
 - name: virtualenv
-  version: 20.24.4
+  version: 20.24.6
   manager: conda
   platform: osx-arm64
   dependencies:
@@ -12924,14 +13012,14 @@ package:
     distlib: <1,>=0.3.7
     filelock: <4,>=3.12.2
     platformdirs: <4,>=3.9.1
-  url: https://conda.anaconda.org/conda-forge/noarch/virtualenv-20.24.4-pyhd8ed1ab_0.conda
+  url: https://conda.anaconda.org/conda-forge/noarch/virtualenv-20.24.6-pyhd8ed1ab_0.conda
   hash:
-    md5: c3feaf947264a59a125e8c26e98c3c5a
-    sha256: 85c96449202ca87ec12783d8675b3655b4cd7b7afe49f2dc37d743adb0ed177f
+    md5: fb1fc875719e217ed799a7aae11d3be4
+    sha256: 09492f89a22dc17d9b32f2a791deee93d06e99fb312c3d47430fe35343b7fbde
   category: main
   optional: false
 - name: aiobotocore
-  version: 2.5.4
+  version: 2.7.0
   manager: conda
   platform: osx-arm64
   dependencies:
@@ -12940,10 +13028,10 @@ package:
     aiohttp: '>=3.3.1,<4.0.0'
     aioitertools: '>=0.5.1,<1.0.0'
     botocore: '>=1.31.17,<1.31.18'
-  url: https://conda.anaconda.org/conda-forge/noarch/aiobotocore-2.5.4-pyhd8ed1ab_0.conda
+  url: https://conda.anaconda.org/conda-forge/noarch/aiobotocore-2.7.0-pyhd8ed1ab_0.conda
   hash:
-    md5: 8baace08a73a2481104903cfc9875ecd
-    sha256: d929df4d8f6353dcdeca87589be214dd507ec3da81f11a38e58b6ffb53328db1
+    md5: 273a1a421309871b051acd6aef346b63
+    sha256: b9f835ad1c95d220f4f7a72e1155d027f5a57c1d109d5eceedd33333562add06
   category: main
   optional: false
 - name: cachecontrol-with-filecache
@@ -13170,7 +13258,7 @@ package:
   category: main
   optional: false
 - name: conda-lock
-  version: 2.4.0
+  version: 2.4.1
   manager: conda
   platform: osx-arm64
   dependencies:
@@ -13198,10 +13286,10 @@ package:
     toolz: '>=0.12.0,<1.0.0'
     cachecontrol-with-filecache: '>=0.12.9'
     urllib3: '>=1.26.5,<2.0'
-  url: https://conda.anaconda.org/conda-forge/noarch/conda-lock-2.4.0-pyhd8ed1ab_0.conda
+  url: https://conda.anaconda.org/conda-forge/noarch/conda-lock-2.4.1-pyhd8ed1ab_0.conda
   hash:
-    md5: edcd5c7565a5cd1c7862a911a899fb20
-    sha256: f3829c7be0d0b37c4a7146cf65123c23cd37b1c21fc051cc93c812d5bc8d4ff7
+    md5: deb6e2f8d8b4de933563cc681165b833
+    sha256: 08cd768d033db260e043982ba91de007213adbde5210a76fd2decad3c135e666
   category: main
   optional: false
 - name: ipython
@@ -13323,18 +13411,18 @@ package:
   category: main
   optional: false
 - name: s3fs
-  version: 2023.9.2
+  version: 2023.10.0
   manager: conda
   platform: osx-arm64
   dependencies:
     aiohttp: ''
     python: '>=3.8'
-    aiobotocore: '>=2.5.4,<2.6.0'
-    fsspec: 2023.9.2
-  url: https://conda.anaconda.org/conda-forge/noarch/s3fs-2023.9.2-pyhd8ed1ab_0.conda
+    fsspec: 2023.10.0
+    aiobotocore: '>=2.7.0,<2.7.1'
+  url: https://conda.anaconda.org/conda-forge/noarch/s3fs-2023.10.0-pyhd8ed1ab_0.conda
   hash:
-    md5: d115889d17f724b17892beb836684bd9
-    sha256: 7926523605602185f70a0aa2b2a62c51105bbac3fd127c75541d2fa28b2febcc
+    md5: 557aa3617c92aa511841887db279dc51
+    sha256: 2f190cf0c550d4ba400af6b62afefa47a01ff5b57ece67354d38037a304f0acb
   category: main
   optional: false
 - name: xarray
@@ -13865,10 +13953,10 @@ package:
     ucrt: '>=10.0.20348.0'
     vc: '>=14.2,<15'
     vc14_runtime: '>=14.29.30139'
-  url: https://conda.anaconda.org/conda-forge/win-64/c-ares-1.20.1-hcfcfb64_0.conda
+  url: https://conda.anaconda.org/conda-forge/win-64/c-ares-1.20.1-hcfcfb64_1.conda
   hash:
-    md5: 4044c96668b5ca9068cc61673bc05a13
-    sha256: d3d329c571a129925ef9d082703351524dcf43dd2eb11cbbf4fea037085a0546
+    md5: 0a45278f9b791a68dbe4acc234fa8a26
+    sha256: 817b2733caef6f8513ed6dc9a1b5883ddc9ac303eaf1971e4d4ec73080f6ab99
   category: main
   optional: false
 - name: fmt
@@ -14847,15 +14935,15 @@ package:
   category: main
   optional: false
 - name: charset-normalizer
-  version: 3.3.0
+  version: 3.3.1
   manager: conda
   platform: win-64
   dependencies:
     python: '>=3.7'
-  url: https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.3.0-pyhd8ed1ab_0.conda
+  url: https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.3.1-pyhd8ed1ab_0.conda
   hash:
-    md5: fef8ef5f0a54546b9efee39468229917
-    sha256: 3407cd21af7e85aeb9499c377e7db25d2bbb9cbaf2f47d92626b3471dca65b4c
+    md5: 985378f74689fccce52f158027bd9acd
+    sha256: a31739c49c4b1c8e0cbdec965ba152683d36ce6e23bdaefcfee99937524dabd1
   category: main
   optional: false
 - name: colorama
@@ -15011,15 +15099,15 @@ package:
   category: main
   optional: false
 - name: fsspec
-  version: 2023.9.2
+  version: 2023.10.0
   manager: conda
   platform: win-64
   dependencies:
     python: '>=3.8'
-  url: https://conda.anaconda.org/conda-forge/noarch/fsspec-2023.9.2-pyh1a96a4e_0.conda
+  url: https://conda.anaconda.org/conda-forge/noarch/fsspec-2023.10.0-pyhca7485f_0.conda
   hash:
-    md5: 9d15cd3a0e944594ab528da37dc72ecc
-    sha256: d95d11d1f501cb69528bb2b620b728f12caf872cb23837bc9bdd6ef405b4ecfb
+    md5: 5b86cf1ceaaa9be2ec4627377e538db1
+    sha256: 1bbdfadb93cc768252fd207dca406cde928f9a81ff985ea1760b6539c55923e6
   category: main
   optional: false
 - name: glob2
@@ -16193,6 +16281,23 @@ package:
     sha256: ee523a09a70c4ef71418b12ea3086169b69969dbfa382791dbde5e1a00e41728
   category: main
   optional: false
+- name: coverage
+  version: 7.3.2
+  manager: conda
+  platform: win-64
+  dependencies:
+    python: '>=3.10,<3.11.0a0'
+    python_abi: 3.10.*
+    tomli: ''
+    ucrt: '>=10.0.20348.0'
+    vc: '>=14.2,<15'
+    vc14_runtime: '>=14.29.30139'
+  url: https://conda.anaconda.org/conda-forge/win-64/coverage-7.3.2-py310h8d17308_0.conda
+  hash:
+    md5: 262bccdaf31082d0458aa45e47a66088
+    sha256: 44b3e74b0de819ec9f6fa9947f349eb4af29a5e5167c7ecdfc85064fae4c1ec3
+  category: main
+  optional: false
 - name: fontconfig
   version: 2.14.2
   manager: conda
@@ -17101,6 +17206,21 @@ package:
     sha256: 7a75bd42fbc7f2ff733cab0621078a5b7e365b37c1744cf1f805a26bcfddf5e9
   category: main
   optional: false
+- name: pytest-cov
+  version: 4.1.0
+  manager: conda
+  platform: win-64
+  dependencies:
+    toml: ''
+    python: '>=3.7'
+    pytest: '>=4.6'
+    coverage: '>=5.2.1'
+  url: https://conda.anaconda.org/conda-forge/noarch/pytest-cov-4.1.0-pyhd8ed1ab_0.conda
+  hash:
+    md5: 06eb685a3a0b146347a58dda979485da
+    sha256: f07d3b44cabbed7843de654c4a6990a08475ce3b708bb735c7da9842614586f2
+  category: main
+  optional: false
 - name: rich
   version: 13.6.0
   manager: conda
@@ -17429,7 +17549,7 @@ package:
   category: main
   optional: false
 - name: virtualenv
-  version: 20.24.4
+  version: 20.24.6
   manager: conda
   platform: win-64
   dependencies:
@@ -17437,14 +17557,14 @@ package:
     distlib: <1,>=0.3.7
     filelock: <4,>=3.12.2
     platformdirs: <4,>=3.9.1
-  url: https://conda.anaconda.org/conda-forge/noarch/virtualenv-20.24.4-pyhd8ed1ab_0.conda
+  url: https://conda.anaconda.org/conda-forge/noarch/virtualenv-20.24.6-pyhd8ed1ab_0.conda
   hash:
-    md5: c3feaf947264a59a125e8c26e98c3c5a
-    sha256: 85c96449202ca87ec12783d8675b3655b4cd7b7afe49f2dc37d743adb0ed177f
+    md5: fb1fc875719e217ed799a7aae11d3be4
+    sha256: 09492f89a22dc17d9b32f2a791deee93d06e99fb312c3d47430fe35343b7fbde
   category: main
   optional: false
 - name: aiobotocore
-  version: 2.5.4
+  version: 2.7.0
   manager: conda
   platform: win-64
   dependencies:
@@ -17453,10 +17573,10 @@ package:
     aiohttp: '>=3.3.1,<4.0.0'
     aioitertools: '>=0.5.1,<1.0.0'
     botocore: '>=1.31.17,<1.31.18'
-  url: https://conda.anaconda.org/conda-forge/noarch/aiobotocore-2.5.4-pyhd8ed1ab_0.conda
+  url: https://conda.anaconda.org/conda-forge/noarch/aiobotocore-2.7.0-pyhd8ed1ab_0.conda
   hash:
-    md5: 8baace08a73a2481104903cfc9875ecd
-    sha256: d929df4d8f6353dcdeca87589be214dd507ec3da81f11a38e58b6ffb53328db1
+    md5: 273a1a421309871b051acd6aef346b63
+    sha256: b9f835ad1c95d220f4f7a72e1155d027f5a57c1d109d5eceedd33333562add06
   category: main
   optional: false
 - name: cachecontrol
@@ -17732,18 +17852,18 @@ package:
   category: main
   optional: false
 - name: s3fs
-  version: 2023.9.2
+  version: 2023.10.0
   manager: conda
   platform: win-64
   dependencies:
     aiohttp: ''
     python: '>=3.8'
-    aiobotocore: '>=2.5.4,<2.6.0'
-    fsspec: 2023.9.2
-  url: https://conda.anaconda.org/conda-forge/noarch/s3fs-2023.9.2-pyhd8ed1ab_0.conda
+    fsspec: 2023.10.0
+    aiobotocore: '>=2.7.0,<2.7.1'
+  url: https://conda.anaconda.org/conda-forge/noarch/s3fs-2023.10.0-pyhd8ed1ab_0.conda
   hash:
-    md5: d115889d17f724b17892beb836684bd9
-    sha256: 7926523605602185f70a0aa2b2a62c51105bbac3fd127c75541d2fa28b2febcc
+    md5: 557aa3617c92aa511841887db279dc51
+    sha256: 2f190cf0c550d4ba400af6b62afefa47a01ff5b57ece67354d38037a304f0acb
   category: main
   optional: false
 - name: cftime
@@ -17783,7 +17903,7 @@ package:
   category: main
   optional: false
 - name: conda-lock
-  version: 2.4.0
+  version: 2.4.1
   manager: conda
   platform: win-64
   dependencies:
@@ -17811,10 +17931,10 @@ package:
     toolz: '>=0.12.0,<1.0.0'
     cachecontrol-with-filecache: '>=0.12.9'
     urllib3: '>=1.26.5,<2.0'
-  url: https://conda.anaconda.org/conda-forge/noarch/conda-lock-2.4.0-pyhd8ed1ab_0.conda
+  url: https://conda.anaconda.org/conda-forge/noarch/conda-lock-2.4.1-pyhd8ed1ab_0.conda
   hash:
-    md5: edcd5c7565a5cd1c7862a911a899fb20
-    sha256: f3829c7be0d0b37c4a7146cf65123c23cd37b1c21fc051cc93c812d5bc8d4ff7
+    md5: deb6e2f8d8b4de933563cc681165b833
+    sha256: 08cd768d033db260e043982ba91de007213adbde5210a76fd2decad3c135e666
   category: main
   optional: false
 - name: contourpy
diff --git a/environment.yml b/environment.yml
index 458442d..12a13d1 100644
--- a/environment.yml
+++ b/environment.yml
@@ -8,6 +8,7 @@ dependencies:
   - isort ~=5.10
   - mypy ~=1.5
   - pytest ~=7.1
+  - pytest-cov ~=4.1.0
   - vulture ~=2.4
   # debugging/development tools
   - ipython
diff --git a/tasks/test.py b/tasks/test.py
index 64a3a76..0a84f87 100644
--- a/tasks/test.py
+++ b/tasks/test.py
@@ -18,7 +18,7 @@ def typecheck(ctx):
 def unit(ctx):
     """Run unit tests."""
     print_and_run(
-        f"pytest -s {PROJECT_DIR}/pm_icecon/tests/unit",
+        f"pytest --cov=pm_icecon --cov-fail-under 34 -s {PROJECT_DIR}/pm_icecon/tests/unit",
         pty=True,
     )
 
@@ -50,12 +50,20 @@ def ci(ctx):
     ...
 
 
+@task()
+def pytest(ctx):
+    """Run all tests with pytest.
+
+    Includes a code-coverage check.
+    """
+    print_and_run(
+        "pytest --cov=pm_icecon --cov-fail-under 81 -s",
+        pty=True,
+    )
+
+
 @task(
-    pre=[
-        typecheck,
-        unit,
-        regression,
-    ],
+    pre=[typecheck, pytest],
     default=True,
 )
 def all(ctx):