Tests: Add tests

integration_tests/CMakeLists.txt

@@ -583,6 +583,7 @@ RUN(NAME test_dict_nested1   LABELS cpython llvm)
 RUN(NAME test_set_len        LABELS cpython llvm)
 RUN(NAME test_set_add        LABELS cpython llvm)
 RUN(NAME test_set_remove     LABELS cpython llvm)
+RUN(NAME test_set_discard     LABELS cpython llvm)
 RUN(NAME test_global_set     LABELS cpython llvm)
 RUN(NAME test_for_loop       LABELS cpython llvm c)
 RUN(NAME modules_01          LABELS cpython llvm c wasm wasm_x86 wasm_x64)

integration_tests/test_set_discard.py

@@ -0,0 +1,48 @@
+from lpython import i32
+
+def test_set_discard():
+    s1: set[i32]
+    s2: set[tuple[i32, tuple[i32, i32], str]]
+    s3: set[str]
+    st1: str
+    i: i32
+    j: i32
+    k: i32
+
+    for k in range(2):
+        s1 = {0}
+        s2 = {(0, (1, 2), "a")}
+        for i in range(20):
+            j = i % 10
+            s1.add(j)
+            s2.add((j, (j + 1, j + 2), "a"))
+
+        for i in range(10):
+            s1.discard(i)
+            s2.discard((i, (i + 1, i + 2), "a"))
+            assert len(s1) == 10 - 1 - i
+            assert len(s1) == len(s2)
+
+    st1 = "a"
+    s3 = {st1}
+    for i in range(20):
+        s3.add(st1)
+        if i < 10:
+            if i > 0:
+                st1 += "a"
+
+    st1 = "a"
+    for i in range(10):
+        s3.discard(st1)
+        assert len(s3) == 10 - 1 - i
+        if i < 10:
+            st1 += "a"
+
+    for i in range(20):
+        s1.add(i)
+        if i % 2 == 0:
+            s1.discard(i)
+        assert len(s1) == (i + 1) // 2
+
+
+test_set_discard()