test: integration tests for imports

extension/examples/valid/.gitignore

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+*
+
+!imports/
+imports/*
+
+!.gitignore
+!*.wacc

extension/examples/valid/imports/alias.wacc

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+# import main from ../sum.wacc and ./basic.wacc
+
+# Output:
+# 15
+# 0
+# -33
+#
+
+# Exit:
+# 0
+
+# Program:
+
+import "../sum.wacc" (main as sumMain)
+import "./basic.wacc" (main)
+
+begin
+  int result1 = call sumMain() ;
+  int result2 = call main() ;
+  println result1 ;
+  println result2
+end

extension/examples/valid/imports/basic.wacc

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+# import sum from ../sum.wacc
+
+# Output:
+# -33
+
+# Exit:
+# 0
+
+# Program:
+
+import "../sum.wacc" (sum)
+
+begin
+  int main() is 
+    int result = call sum(-10, -23) ;
+    return result
+  end
+  int result = call main() ;
+  println result
+end

extension/examples/valid/imports/manyMains.wacc

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+# import all the mains
+
+# Output:
+# 15
+# 0
+# -33
+# 0
+# -33
+# 0
+#
+
+# Exit:
+# 99
+
+# Program:
+
+import "../sum.wacc" (main as sumMain)
+import "./basic.wacc" (main as basicMain)
+import "./multiFunc.wacc" (main as multiFuncMain)
+
+begin
+  int main() is 
+    int result1 = call sumMain() ;
+    int result2 = call basicMain() ;
+    int result3 = call multiFuncMain() ;
+    println result1 ;
+    println result2 ;
+    println result3 ;
+    return 99
+  end
+
+  int result = call main() ;
+  exit result
+end

extension/examples/valid/imports/mutliFunc.wacc

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+# import sum, main from ../sum.wacc
+
+# Output:
+# 15
+# -33
+# 0
+# 0
+#
+
+# Exit:
+# 0
+
+# Program:
+
+import "../sum.wacc" (sum, main as sumMain)
+
+begin
+  int main() is 
+    int result = call sum(-10, -23) ;
+    println result ;
+    return 0
+  end
+  int result1 = call sumMain() ;
+  int result2 = call main() ;
+  println result1 ;
+  println result2
+end

extension/examples/valid/sum.wacc

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+# simple sum program
+
+# Output:
+# 15
+#
+
+# Exit:
+# 0
+
+# Program:
+
+begin
+  int sum(int a, int b) is 
+    return a + b
+  end
+
+  int main() is
+    int a = 5 ;
+    int b = 10 ;
+    int result = call sum(a, b) ;
+    println result ;
+    return 0
+  end
+
+  int result = call main() ;
+  exit result
+end