tests: moved unit tests for lstring module

FossilOrigin-Name: 1f56cd6c876e6259db88e020f829e5e18b8beb8626a7fcf89d47d36f81b17d54

tests/lstring.nim

@@ -0,0 +1,112 @@
+import ../src/[constants, lstring]
+import unittest2
+
+suite "Unit tests for lstring module":
+
+  test "Appending a LimitedString to a LimitedString":
+    var testString: LimitedString = initLimitedString(capacity = 14, text = "test")
+    testString.add(" and test")
+    check:
+      $testString == "test and test"
+    testString.add("2")
+    check:
+      $testString == "test and test2"
+    try:
+      testString.add("very long text outside of max allowed lenght")
+    except CapacityError:
+      assert $testString == "test and test2", "Failed to not append too long string to LimitedString"
+
+  test "Getting length and capacity of a LimitedString":
+    let testString: LimitedString = initLimitedString(capacity = 14, text = "test")
+    check:
+      testString.len == 4
+      testString.capacity == 14
+
+  test "Comparison of a LimitedString and a string":
+    let testString: LimitedString = initLimitedString(capacity = 4, text = "test")
+    check:
+      testString != "test2"
+      testString == "test"
+
+  test "Adding a string to a LimitedString":
+    let testString: LimitedString = initLimitedString(capacity = 4, text = "test")
+    check:
+      testString & "test" == "testtest"
+      "new" & testString == "newtest"
+
+  test "Converting a LimitedString to a string":
+    let testString: LimitedString = initLimitedString(capacity = 4, text = "test")
+    check:
+      $testString == "test"
+
+  test "emptyLimitedString":
+    let testString: LimitedString = emptyLimitedString(maxInputLength)
+    check:
+      testString.capacity == maxInputLength
+      testString == ""
+
+  test "Find a character in a LimiteString":
+    let testString: LimitedString = initLimitedString(capacity = 4, text = "test")
+    check:
+      testString.find('e') == 1
+      testString.find('a') == -1
+
+  test "Assign a too long text to a LimitedString":
+    try:
+      let testString: LimitedString = initLimitedString(capacity = 4,
+          text = "too long text")
+      assert $testString == "too long text", "Failed to assing too long text to LimitedString."
+    except CapacityError:
+      discard
+
+  test "Insert a string into a LimitedString":
+    var testString: LimitedString = initLimitedString(capacity = 15, text = "test")
+    testString.insert("start and ")
+    check:
+      $testString == "start and test"
+    testString.insert("2", 2)
+    check:
+      $testString == "st2art and test"
+    try:
+      testString.insert("very long text outside of max allowed lenght")
+    except CapacityError:
+      assert $testString == "st2art and test", "Failed to not insert a too long string to LimitedString."
+
+  test "Reverse find of a character in a LimitedString":
+    let testString: LimitedString = initLimitedString(capacity = 4, text = "test")
+    check:
+      testString.rfind('e') == 1
+      testString.rfind('a') == -1
+
+  test "Insert a character into a LimitedString":
+    var testString: LimitedString = initLimitedString(capacity = 14, text = "test")
+    testString[3] = 'a'
+    check:
+      $testString == "tesa"
+
+  test "Get a string's slice from a LimitedString":
+    let testString: LimitedString = initLimitedString(capacity = 14, text = "test")
+    check:
+      $testString[1..2] == "es"
+
+  test "Get a character from a LimitedString":
+    let testString: LimitedString = initLimitedString(capacity = 4, text = "test")
+    check:
+      testString[1] == 'e'
+
+  test "Check do a LimitedString starts with the selected string":
+    let testString: LimitedString = initLimitedString(capacity = 4, text = "test")
+    check:
+      testString.startsWith("te")
+      not testString.startsWith("as")
+
+  test "Set the text property of a LimitedString":
+    var testString: LimitedString = initLimitedString(capacity = 10,
+        text = "old text")
+    testString.text = "new text"
+    check:
+      testString == "new text"
+    try:
+      testString.text = "very long text which should not go"
+    except CapacityError:
+      assert testString == "new text", "Failed to not set too long string as LimitedString."