tutorial injecting user values

packages/squiggle-lang/__tests__/ReducerProject/ReducerProject_tutorial_3_injecting_user_values.res

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+@@warning("-44")
+module InternalExpressionValue = ReducerInterface_InternalExpressionValue
+module Project = ForTS_ReducerProject
+module Bindings = Reducer_Bindings
+
+open Jest
+open Expect
+open Expect.Operators
+
+describe("ReducerProject Tutorial", () => {
+  /* Let's build a project that depends on values from the UI */
+  let project = Project.createProject()
+  Project.setSource(project, "main", "x+y+z")
+  /* x, y and z is not defined in the project but they has to come from the user */
+  test("Injecting user values", () => {
+    /* User has input the values */
+    let x = 1
+    let y = 2
+    let z = 3
+    /* Then we construct a source code to define those values */
+    let userCode = `
+      x = ${x->Js.Int.toString}
+      y = ${y->Js.Int.toString}
+      z = ${z->Js.Int.toString}
+    `
+    /* We inject the user code into the project */
+    Project.setSource(project, "userCode", userCode)
+    /* "main" is depending on the user code */
+    Project.setContinues(project, "main", ["userCode"])
+    /* We can now run the project */
+    Project.runAll(project)
+    let result = Project.getResult(project, "main")
+    result->InternalExpressionValue.toStringOptionResult->expect == "Ok(6)"
+  })
+})
+
+/* Note that this is not final version of the project */
+/* In the future, for safety, we will provide a way to inject values instead of a source code */
+/* But time is limited for now... */