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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2022 Philip McGrath <philip@philipmcgrath.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (test-elm)
+  #:use-module (guix build-system elm)
+  #:use-module (guix import elm)
+  #:use-module (guix base32)
+  #:use-module (guix hash)
+  #:use-module (guix utils)
+  #:autoload   (gcrypt hash) (hash-algorithm sha256)
+  #:use-module (json)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-64))
+
+(test-begin "elm")
+
+(test-group "elm->package-name and infer-elm-package-name"
+  (test-group "round trip"
+    ;; Cases when our heuristics can find the upstream name.
+    (define-syntax-rule (test-round-trip elm guix)
+      (test-group elm
+        (test-equal "elm->package-name" guix
+                    (elm->package-name elm))
+        (test-equal "infer-elm-package-name" elm
+                    (infer-elm-package-name guix))))
+    (test-round-trip "elm/core" "elm-core")
+    (test-round-trip "elm/html" "elm-html")
+    (test-round-trip "elm-explorations/markdown" "elm-explorations-markdown")
+    (test-round-trip "elm-explorations/test" "elm-explorations-test")
+    (test-round-trip "elm-explorations/foo-bar" "elm-explorations-foo-bar")
+    (test-round-trip "elm/explorations" "elm-explorations")
+    (test-round-trip "terezka/intervals" "elm-terezka-intervals")
+    (test-round-trip "justinmimbs/time-extra" "elm-justinmimbs-time-extra")
+    (test-round-trip "danhandrea/elm-date-format"
+                     "elm-danhandrea-elm-date-format"))
+  (test-group "upstream-name needed"
+    ;; Upstream names that our heuristic can't infer.  We still check that the
+    ;; round-trip behavior of 'infer-elm-package-name' works as promised for
+    ;; the hypothetical Elm name it doesn't infer.
+    (define-syntax-rule (test-upstream-needed elm guix inferred)
+      (test-group elm
+        (test-equal "elm->package-name" guix
+                    (elm->package-name elm))
+        (test-group "infer-elm-package-name"
+          (test-equal "infers other name" inferred
+                      (infer-elm-package-name guix))
+          (test-equal "infered name round-trips" guix
+                      (elm->package-name inferred)))))
+    (test-upstream-needed "elm/virtual-dom"
+                          "elm-virtual-dom"
+                          "virtual/dom")
+    (test-upstream-needed "elm/project-metadata-utils"
+                          "elm-project-metadata-utils"
+                          "project/metadata-utils")
+    (test-upstream-needed "explorations/foo"
+                          "elm-explorations-foo"
+                          "elm-explorations/foo")
+    (test-upstream-needed "explorations/foo-bar"
+                          "elm-explorations-foo-bar"
+                          "elm-explorations/foo-bar")
+    (test-upstream-needed "explorations-central/foo"
+                          "elm-explorations-central-foo"
+                          "elm-explorations/central-foo")
+    (test-upstream-needed "explorations-central/foo-bar"
+                          "elm-explorations-central-foo-bar"
+                          "elm-explorations/central-foo-bar")
+    (test-upstream-needed "elm-xyz/foo"
+                          "elm-xyz-foo"
+                          "xyz/foo")
+    (test-upstream-needed "elm-xyz/foo-bar"
+                          "elm-xyz-foo-bar"
+                          "xyz/foo-bar")
+    (test-upstream-needed "elm-explorations-xyz/foo"
+                          "elm-explorations-xyz-foo"
+                          "elm-explorations/xyz-foo")
+    (test-upstream-needed "elm-explorations-xyz/foo-bar"
+                          "elm-explorations-xyz-foo-bar"
+                          "elm-explorations/xyz-foo-bar"))
+  (test-group "no inferred Elm name"
+    ;; Cases that 'infer-elm-package-name' should not attempt to handle,
+    ;; because 'elm->package-name' would never produce such names.
+    (define-syntax-rule (test-not-inferred guix)
+      (test-assert guix (not (infer-elm-package-name guix))))
+    (test-not-inferred "elm")
+    (test-not-inferred "guile")
+    (test-not-inferred "gcc-toolchain")
+    (test-not-inferred "font-adobe-source-sans-pro")))
+
+(define test-package-registry-json
+  ;; we intentionally list versions in different orders here
+  "{
+    \"elm/core\": [\"1.0.0\", \"1.0.1\", \"1.0.2\", \"1.0.3\", \"1.0.4\"],
+    \"elm-guix/demo\": [\"2.0.0\", \"3.0.0\", \"1.0.0\"]
+}")
+
+(define test-elm-core-json
+  "{
+    \"type\": \"package\",
+    \"name\": \"elm/core\",
+    \"summary\": \"Elm's standard libraries\",
+    \"license\": \"BSD-3-Clause\",
+    \"version\": \"1.0.4\",
+    \"exposed-modules\": {
+        \"Primitives\": [
+            \"Basics\",
+            \"String\",
+            \"Char\",
+            \"Bitwise\",
+            \"Tuple\"
+        ],
+        \"Collections\": [
+            \"List\",
+            \"Dict\",
+            \"Set\",
+            \"Array\"
+        ],
+        \"Error Handling\": [
+            \"Maybe\",
+            \"Result\"
+        ],
+        \"Debug\": [
+            \"Debug\"
+        ],
+        \"Effects\": [
+            \"Platform.Cmd\",
+            \"Platform.Sub\",
+            \"Platform\",
+            \"Process\",
+            \"Task\"
+        ]
+    },
+    \"elm-version\": \"0.19.0 <= v < 0.20.0\",
+    \"dependencies\": {},
+    \"test-dependencies\": {}
+}")
+
+(define test-elm-core-readme
+  "# Core Libraries
+
+Every Elm project needs this package!
+
+It provides **basic functionality** like addition and subtraction as well as
+**data structures** like lists, dictionaries, and sets.")
+
+(define test-elm-guix-demo-json
+  "{
+    \"type\": \"package\",
+    \"name\": \"elm-guix/demo\",
+    \"summary\": \"A test for `(guix import elm)`\",
+    \"license\": \"GPL-3.0-or-later\",
+    \"version\": \"3.0.0\",
+    \"exposed-modules\": [
+        \"Guix.Demo\"
+    ],
+    \"elm-version\": \"0.19.0 <= v < 0.20.0\",
+    \"dependencies\": {
+        \"elm/core\": \"1.0.0 <= v < 2.0.0\"
+    },
+    \"test-dependencies\": {
+        \"elm/json\": \"1.0.0 <= v < 2.0.0\"
+    }
+}")
+
+(define test-elm-guix-demo-readme
+  ;; intentionally left blank
+  "")
+
+(define (directory-sha256 directory)
+  "Returns the string representing the hash of DIRECTORY as would be used in a
+package definition."
+  (bytevector->nix-base32-string
+   (file-hash* directory
+               #:algorithm (hash-algorithm sha256)
+               #:recursive? #t)))
+
+(test-group "(guix import elm)"
+  (call-with-temporary-directory
+   (lambda (dir)
+     ;; Initialize our fake git checkouts.
+     (define elm-core-dir
+       (string-append dir "/test-elm-core-1.0.4"))
+     (define elm-guix-demo-dir
+       (string-append dir "/test-elm-guix-demo-3.0.0"))
+     (for-each (match-lambda
+                 ((dir json readme)
+                  (mkdir dir)
+                  (with-output-to-file (string-append dir "/elm.json")
+                    (lambda ()
+                      (display json)))
+                  (with-output-to-file (string-append dir "/README.md")
+                    (lambda ()
+                      (display readme)))))
+               `((,elm-core-dir ,test-elm-core-json ,test-elm-core-readme)
+                 (,elm-guix-demo-dir
+                  ,test-elm-guix-demo-json
+                  ,test-elm-guix-demo-readme)))
+     ;; Replace network resources with sample data.
+     (parameterize ((%elm-package-registry
+                     (lambda ()
+                       (json-string->scm test-package-registry-json)))
+                    (%current-elm-checkout
+                     (lambda (name version)
+                       (match (list name version)
+                         (("elm/core" "1.0.4")
+                          elm-core-dir)
+                         (("elm-guix/demo" "3.0.0")
+                          elm-guix-demo-dir)))))
+       (test-assert "(elm->guix-package \"elm/core\")"
+         (match (elm->guix-package "elm/core")
+           (`(package
+               (name "elm-core")
+               (version "1.0.4")
+               (source (elm-package-origin
+                        "elm/core"
+                        version
+                        (base32 ,(? string? hash))))
+               (build-system elm-build-system)
+               (home-page
+                "https://package.elm-lang.org/packages/elm/core/1.0.4")
+               (synopsis "Elm's standard libraries")
+               (description "Every Elm project needs this package!")
+               (license license:bsd-3))
+            (equal? (directory-sha256 elm-core-dir)
+                    hash))
+           (x
+            (raise-exception x))))
+       (test-assert "(elm-recursive-import \"elm-guix/demo\")"
+         (match (elm-recursive-import "elm-guix/demo")
+           (`((package
+                (name "elm-guix-demo")
+                (version "3.0.0")
+                (source (elm-package-origin
+                         "elm-guix/demo"
+                         version
+                         (base32 ,(? string? hash))))
+                (build-system elm-build-system)
+                (propagated-inputs
+                 ,'`(("elm-core" ,elm-core)))
+                (inputs
+                 ,'`(("elm-json" ,elm-json)))
+                (home-page
+                 "https://package.elm-lang.org/packages/elm-guix/demo/3.0.0")
+                (synopsis "A test for `(guix import elm)`")
+                (description
+                 "This package provides a test for `(guix import elm)`")
+                (properties '((upstream-name . "elm-guix/demo")))
+                (license license:gpl3+)))
+            (equal? (directory-sha256 elm-guix-demo-dir)
+                    hash))
+           (x
+            (raise-exception x))))))))
+
+(test-end "elm")