Add basic test harness, actually add files this time

test/cases/if.ld

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+& EXPECT (:true, :false, :true, :false)
+let true_literal = if true then :true else :false
+let false_literal = if false then :true else :false
+let truthy = if :truthy then :true else :false
+let falsy = if nil then :true else :false
+
+(true_literal, false_literal, truthy, falsy)

test/cases/list_atoms.ld

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+& EXPECT [:one, 2, "three"]
+[:one, 2, "three"]

test/cases/single_float.ld

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+& EXPECT 12.123
+12.123

test/cases/single_int.ld

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+& EXPECT 42
+42

test/cases/single_string.ld

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+& EXPECT "foo"
+"foo"

test/cases/tuple_keywords.ld

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+& EXPECT (true, false, nil)
+(true, false, nil)

test/run_tests.js

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+import {run} from "../target/js/ludus.js"
+import * as fs from "node:fs/promises"
+import t from "tap"
+
+const case_path = "./cases"
+const files = await fs.readdir(case_path)
+
+for (const file of files) {
+  const script = await fs.readFile(`${case_path}/${file}`, {encoding: "utf8"})
+  const first_line = script.split("\n")[0]
+  const expected = first_line.split("EXPECT")[1].trim()
+  const result = run(script).result
+  t.test(`testing ${file}: EXPECT ${expected}, GOT ${result}`, 
+    t => {
+      t.equal(expected, result)
+      t.end()
+    })
+}