Add pin-depends tests

test/bin/pin-depends.t/#simple-lock.opam#

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+opam-version: "2.0"
+depends: [
+  "dune"
+  "b"
+  "c"
+]
+x-opam-monorepo-opam-repositories: [
+  "file://$OPAM_MONOREPO_CWD/minimal-repo"
+  "file://$OPAM_MONOREPO_CWD/repo"
+]

test/bin/pin-depends.t/.#simple-lock.opam

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+thomas@girolata.local.73356

test/bin/pin-depends.t/pin-depends.opam

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+opam-version: "2.0"
+depends: [
+  "dune"
+  "b"
+  "c"
+]
+pin-depends:[
+ ["a" "https://x"]
+ ["base-bigarrays" "https://y"]
+]
+x-opam-monorepo-opam-repositories: [
+  "file://$OPAM_MONOREPO_CWD/minimal-repo"
+  "file://$OPAM_MONOREPO_CWD/repo"
+]

test/bin/pin-depends.t/pin-depends.opam~

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+opam-version: "2.0"
+depends: [
+  "dune"
+  "b"
+  "c"
+]
+x-opam-monorepo-opam-repositories: [
+  "file://$OPAM_MONOREPO_CWD/minimal-repo"
+  "file://$OPAM_MONOREPO_CWD/repo"
+]

test/bin/pin-depends.t/repo/packages/b/b.1/opam

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+opam-version: "2.0"
+depends: [
+  "dune"
+]
+build: [ "dune" "build" ]
+dev-repo: "git+https://github.com/b/b"
+url {
+  src: "https://b.com/b.tbz"
+  checksum: [
+    "sha256=0000000000000000000000000000000000000000000000000000000000000000"
+  ]
+}

test/bin/pin-depends.t/repo/packages/c/c.1/opam

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+opam-version: "2.0"
+depends: [
+  "dune"
+]
+build: [ "dune" "build" ]
+dev-repo: "git+https://github.com/c/c"
+url {
+  src: "https://c.com/c.tbz"
+  checksum: [
+    "sha256=0000000000000000000000000000000000000000000000000000000000000001"
+  ]
+}

test/bin/pin-depends.t/repo/repo

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+opam-version: "2.0"

test/bin/pin-depends.t/run.t

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+We have a simple project with a single package defined at the root.
+It has a `x-opam-monorepo-opam-repositories` field set to use a local
+opam-repository for locking and a pinned package.
+
+  $ cat pin-depends.opam
+  opam-version: "2.0"
+  depends: [
+    "dune"
+    "b"
+    "c"
+  ]
+  pin-depends:[
+   ["a" "https://x"]
+   ["base-bigarrays" "https://y"]
+  ]
+  x-opam-monorepo-opam-repositories: [
+    "file://$OPAM_MONOREPO_CWD/minimal-repo"
+    "file://$OPAM_MONOREPO_CWD/repo"
+  ]
+
+We provided a minimal opam-repository but locking should be successful.
+
+  $ gen-minimal-repo
+  $ opam-monorepo lock
+  ==> Using 1 locally scanned package as the target.
+  ==> Found 10 opam dependencies for the target package.
+  ==> Querying opam database for their metadata and Dune compatibility.
+  ==> Calculating exact pins for each of them.
+  ==> Wrote lockfile with 2 entries to $TESTCASE_ROOT/pin-depends.opam.locked. You can now run opam monorepo pull to fetch their sources.
+
+The lockfile should contain the base packages, dune and our 2 dependencies
+`b` and `c` which should be pulled in the duniverse
+
+  $ cat pin-depends.opam.locked
+  opam-version: "2.0"
+  synopsis: "opam-monorepo generated lockfile"
+  maintainer: "opam-monorepo"
+  depends: [
+    "b" {= "1" & ?vendor}
+    "base-bigarray" {= "base"}
+    "base-threads" {= "base"}
+    "base-unix" {= "base"}
+    "c" {= "1" & ?vendor}
+    "dune" {= "2.9.1"}
+    "ocaml" {= "4.13.1"}
+    "ocaml-base-compiler" {= "4.13.1"}
+    "ocaml-config" {= "2"}
+    "ocaml-options-vanilla" {= "1"}
+  ]
+  x-opam-monorepo-duniverse-dirs: [
+    [
+      "https://b.com/b.tbz"
+      "b"
+      [
+        "sha256=0000000000000000000000000000000000000000000000000000000000000000"
+      ]
+    ]
+    [
+      "https://c.com/c.tbz"
+      "c"
+      [
+        "sha256=0000000000000000000000000000000000000000000000000000000000000001"
+      ]
+    ]
+  ]
+  x-opam-monorepo-opam-repositories: [
+    "file://$OPAM_MONOREPO_CWD/minimal-repo" "file://$OPAM_MONOREPO_CWD/repo"
+  ]
+  x-opam-monorepo-root-packages: ["pin-depends"]
+  x-opam-monorepo-version: "0.3"

test/bin/pin-depends.t/run.t~

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+We have a simple project with a single package defined at the root.
+It has a `x-opam-monorepo-opam-repositories` field set to use a local
+opam-repository for locking
+
+  $ cat simple-lock.opam
+  opam-version: "2.0"
+  depends: [
+    "dune"
+    "b"
+    "c"
+  ]
+  x-opam-monorepo-opam-repositories: [
+    "file://$OPAM_MONOREPO_CWD/minimal-repo"
+    "file://$OPAM_MONOREPO_CWD/repo"
+  ]
+
+We provided a minimal opam-repository but locking should be successful.
+
+  $ gen-minimal-repo
+  $ opam-monorepo lock
+  ==> Using 1 locally scanned package as the target.
+  ==> Found 10 opam dependencies for the target package.
+  ==> Querying opam database for their metadata and Dune compatibility.
+  ==> Calculating exact pins for each of them.
+  ==> Wrote lockfile with 2 entries to $TESTCASE_ROOT/simple-lock.opam.locked. You can now run opam monorepo pull to fetch their sources.
+
+The lockfile should contain the base packages, dune and our 2 dependencies
+`b` and `c` which should be pulled in the duniverse
+
+  $ cat simple-lock.opam.locked
+  opam-version: "2.0"
+  synopsis: "opam-monorepo generated lockfile"
+  maintainer: "opam-monorepo"
+  depends: [
+    "b" {= "1" & ?vendor}
+    "base-bigarray" {= "base"}
+    "base-threads" {= "base"}
+    "base-unix" {= "base"}
+    "c" {= "1" & ?vendor}
+    "dune" {= "2.9.1"}
+    "ocaml" {= "4.13.1"}
+    "ocaml-base-compiler" {= "4.13.1"}
+    "ocaml-config" {= "2"}
+    "ocaml-options-vanilla" {= "1"}
+  ]
+  x-opam-monorepo-duniverse-dirs: [
+    [
+      "https://b.com/b.tbz"
+      "b"
+      [
+        "sha256=0000000000000000000000000000000000000000000000000000000000000000"
+      ]
+    ]
+    [
+      "https://c.com/c.tbz"
+      "c"
+      [
+        "sha256=0000000000000000000000000000000000000000000000000000000000000001"
+      ]
+    ]
+  ]
+  x-opam-monorepo-opam-repositories: [
+    "file://$OPAM_MONOREPO_CWD/minimal-repo" "file://$OPAM_MONOREPO_CWD/repo"
+  ]
+  x-opam-monorepo-root-packages: ["simple-lock"]
+  x-opam-monorepo-version: "0.3"