tests: moved unit tests for input module

FossilOrigin-Name: 233a3d8883e9fdfaf918a9ce15535d21af698748faf09bb329834d8cb19631a6

tests/input.nim

@@ -0,0 +1,50 @@
+import std/parseopt
+import ../src/[constants, input, lstring]
+import unittest2
+
+suite "Unit tests for input module":
+
+  test "getArguments":
+    var
+      userCommand: OptParser = initOptParser("ls -ab --foo --bar=20 file.txt")
+      conjCommands: bool = true
+      arguments: UserInput = getArguments(userCommand, conjCommands)
+    check:
+      arguments == initLimitedString(capacity = maxInputLength,
+        text = "ls -ab --foo --bar=20 file.txt")
+
+  test "readInput":
+    echo "exit"
+    check:
+      readInput() == initLimitedString(capacity = maxInputLength, text = "exit")
+
+  test "readChar":
+    check:
+      readChar('c') == "c"
+      readChar('H') == "H"
+
+  test "deleteChar":
+    var
+      inputString = initLimitedString(capacity = maxInputLength, text = "my text")
+      cursorPosition: Natural = 1
+    deleteChar(inputString, cursorPosition)
+    check:
+      inputString == "y text"
+      cursorPosition == 0
+
+  test "moveCursor":
+    let inputString = initLimitedString(capacity = maxInputLength,
+        text = "my text")
+    var cursorPosition: Natural = 1
+    moveCursor('D', cursorPosition, inputString)
+    check:
+      cursorPosition == 0
+
+  test "updateInput":
+    var
+      inputString = initLimitedString(capacity = maxInputLength, text = "my text")
+      cursorPosition: Natural = 7
+    updateInput(cursorPosition, inputString, false, "a")
+    check:
+      inputString == "my texta"
+      cursorPosition == 8