Add tests

tests/config.nims

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+switch("define", "nimUnittestOutputLevel:PRINT_FAILURES")
+switch("warnings", false)
+switch("hints", false)
+switch("path", "$projectDir/../src")

tests/nim.cfg

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+--path: "../src/"

tests/utils/test_str.nim

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+import std/unittest
+import utils/str
+
+suite "utils/str":
+  test "safeDelete":
+    let t = "abc"
+    check(t.safeDelete(0..0) == "abc")
+
+    check(t.safeDelete(0..1) == "c")
+    check(t.safeDelete(1..1) == "ac")
+    check(t.safeDelete(2..2) == "ab")
+
+    # Out of bounds slicing
+    check(t.safeDelete(0..10) == "")
+    check(t.safeDelete(10..1) == t)
+    check(t.safeDelete(3..3) == t)
+    check(t.safeDelete(3..(-1)) == t)
+
+  test "findAndDelete":
+    let t = "foo\nbar"
+    check(t.deleteAfterNewline() == "foo")
+    check(t.deleteAfterNewline(start = 4) == t)