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-rw-r--r--nix/readTree/tests/default.nix127
1 files changed, 127 insertions, 0 deletions
diff --git a/nix/readTree/tests/default.nix b/nix/readTree/tests/default.nix
new file mode 100644
index 000000000000..3354a4fe5e75
--- /dev/null
+++ b/nix/readTree/tests/default.nix
@@ -0,0 +1,127 @@
+{ depot, lib, ... }:
+
+let
+  inherit (depot.nix.runTestsuite)
+    runTestsuite
+    it
+    assertEq
+    assertThrows
+    ;
+
+  tree-ex = depot.nix.readTree {
+    path = ./test-example;
+    args = {};
+  };
+
+  example = it "corresponds to the README example" [
+    (assertEq "third_party attrset"
+      (lib.isAttrs tree-ex.third_party
+      && (! lib.isDerivation tree-ex.third_party))
+      true)
+    (assertEq "third_party attrset other attribute"
+      tree-ex.third_party.favouriteColour
+      "orange")
+    (assertEq "rustpkgs attrset aho-corasick"
+      tree-ex.third_party.rustpkgs.aho-corasick
+      "aho-corasick")
+    (assertEq "rustpkgs attrset serde"
+      tree-ex.third_party.rustpkgs.serde
+      "serde")
+    (assertEq "tools cheddear"
+      "cheddar"
+      tree-ex.tools.cheddar)
+    (assertEq "tools roquefort"
+      tree-ex.tools.roquefort
+      "roquefort")
+  ];
+
+  tree-tl = depot.nix.readTree {
+    path = ./test-tree-traversal;
+    args = {};
+  };
+
+  traversal-logic = it "corresponds to the traversal logic in the README" [
+    (assertEq "skip subtree default.nix is read"
+      tree-tl.skip-subtree.but
+      "the default.nix is still read")
+    (assertEq "skip subtree a/default.nix is skipped"
+      (tree-tl.skip-subtree ? a)
+      false)
+    (assertEq "skip subtree b/c.nix is skipped"
+      (tree-tl.skip-subtree ? b)
+      false)
+    (assertEq "skip subtree a/default.nix would be read without .skip-subtree"
+      (tree-tl.no-skip-subtree.a)
+      "am I subtree yet?")
+    (assertEq "skip subtree b/c.nix would be read without .skip-subtree"
+      (tree-tl.no-skip-subtree.b.c)
+      "cool")
+
+    (assertEq "default.nix attrset is merged with siblings"
+      tree-tl.default-nix.no
+      "siblings should be read")
+    (assertEq "default.nix means sibling isn’t read"
+      (tree-tl.default-nix ? sibling)
+      false)
+    (assertEq "default.nix means subdirs are still read and merged into default.nix"
+      (tree-tl.default-nix.subdir.a)
+      "but I’m picked up")
+
+    (assertEq "default.nix can be not an attrset"
+      tree-tl.default-nix.no-merge
+      "I’m not merged with any children")
+    (assertEq "default.nix is not an attrset -> children are not merged"
+      (tree-tl.default-nix.no-merge ? subdir)
+      false)
+
+    (assertEq "default.nix can contain a derivation"
+      (lib.isDerivation tree-tl.default-nix.can-be-drv)
+      true)
+    (assertEq "Even if default.nix is a derivation, children are traversed and merged"
+      tree-tl.default-nix.can-be-drv.subdir.a
+      "Picked up through the drv")
+    (assertEq "default.nix drv is not changed by readTree"
+      tree-tl.default-nix.can-be-drv
+      (import ./test-tree-traversal/default-nix/can-be-drv/default.nix {}))
+  ];
+
+  # these each call readTree themselves because the throws have to happen inside assertThrows
+  wrong = it "cannot read these files and will complain" [
+    (assertThrows "this file is not a function"
+      (depot.nix.readTree {
+        path = ./test-wrong-not-a-function;
+        args = {};
+      }).not-a-function)
+    # can’t test for that, assertThrows can’t catch this error
+    # (assertThrows "this file is a function but doesn’t have dots"
+    #   (depot.nix.readTree {} ./test-wrong-no-dots).no-dots-in-function)
+  ];
+
+  read-markers = depot.nix.readTree {
+    path = ./test-marker;
+    args = {};
+  };
+
+  assertMarkerByPath = path:
+    assertEq "${lib.concatStringsSep "." path} is marked correctly"
+      (lib.getAttrFromPath path read-markers).__readTree path;
+
+  markers = it "marks nodes correctly" [
+    (assertMarkerByPath [ "directory-marked" ])
+    (assertMarkerByPath [ "directory-marked" "nested" ])
+    (assertMarkerByPath [ "file-children" "one" ])
+    (assertMarkerByPath [ "file-children" "two" ])
+    (assertEq "nix file children are marked correctly"
+      read-markers.file-children.__readTreeChildren [ "one" "two" ])
+    (assertEq "directory children are marked correctly"
+      read-markers.directory-marked.__readTreeChildren [ "nested" ])
+    (assertEq "absence of children is marked"
+      read-markers.directory-marked.nested.__readTreeChildren [ ])
+  ];
+
+in runTestsuite "readTree" [
+  example
+  traversal-logic
+  wrong
+  markers
+]