diff --git a/src/schedTest.c b/src/schedTest.c
index 68b29a5..09ed3a1 100644
--- a/src/schedTest.c
+++ b/src/schedTest.c
@@ -1411,3 +1411,162 @@ KTEST(threadSetPriorityChangesWeightOfALiveThread)
     uint32 id = threadCreate("priorityChange", noopThreadEntry);
     KT_NE(t, id, threadInvalidId);
 
+    KT_TRUE(t, threadSetPriority(id, 4096));
+    KT_EQU(t, threadPriority(id), 4096u);
+
+    KT_TRUE(t, threadDiscard(id));
+}
+
+KTEST(threadSetPriorityRejectsDeadOrUnusedTarget)
+{
+    uint32 id = threadCreate("prioritySetOnDead", noopThreadEntry);
+    KT_NE(t, id, threadInvalidId);
+
+    KT_TRUE(t, threadKill(id));
+    KT_FALSE(t, threadSetPriority(id, 4096));
+
+    KT_TRUE(t, threadReap(id));
+    KT_FALSE(t, threadSetPriority(id, 4096));
+}
+
+KTEST(threadKillGroupKillsEveryLiveMemberAndLeavesOtherGroupsAlone)
+{
+    uint32 a = threadCreate("groupKillA", noopThreadEntry);
+    uint32 b = threadCreate("groupKillB", noopThreadEntry);
+    uint32 outsider = threadCreate("groupKillOutsider", noopThreadEntry);
+    KT_NE(t, a, threadInvalidId);
+    KT_NE(t, b, threadInvalidId);
+    KT_NE(t, outsider, threadInvalidId);
+
+    uint32 pgid = threadAt(a)->pgid;
+    KT_TRUE(t, threadSetPgid(b, pgid));
+    KT_NE(t, threadAt(outsider)->pgid, pgid);
+
+    KT_TRUE(t, threadKillGroup(pgid));
+    KT_EQ(t, threadAt(a)->state, threadDead);
+    KT_EQ(t, threadAt(b)->state, threadDead);
+    /* A completely different group must be untouched -- the exact scoping
+       property keyboard.c's real Ctrl-C/Ctrl-Z depends on (user/pgroupfg.c/
+       user/pgroupbg.c is the live ring-3 proof for sigRaiseGroup's own
+       version of this same scoping, signal.c). */
+    KT_EQ(t, threadAt(outsider)->state, threadRunnable);
+
+    KT_TRUE(t, threadReap(a));
+    KT_TRUE(t, threadReap(b));
+    KT_TRUE(t, threadDiscard(outsider));
+}
+
+KTEST(threadKillGroupReturnsFalseWhenNoLiveThreadHasThatPgid)
+{
+    /* No thread created anywhere in this whole KTEST run ever uses this
+       exact value as its pgid -- ids never reach anywhere near it (see
+       threadCapacity/maxThreads), so it can never collide with a real
+       group by coincidence. */
+    KT_FALSE(t, threadKillGroup(0xBEEF0000u));
+}
+
+KTEST(threadKillGroupSkipsAlreadyDeadMembersButStillReportsTheGroupAsFound)
+{
+    uint32 a = threadCreate("groupKillDeadA", noopThreadEntry);
+    uint32 b = threadCreate("groupKillDeadB", noopThreadEntry);
+    KT_NE(t, a, threadInvalidId);
+    KT_NE(t, b, threadInvalidId);
+
+    uint32 pgid = threadAt(a)->pgid;
+    KT_TRUE(t, threadSetPgid(b, pgid));
+
+    /* b is killed FIRST, independently -- threadKillGroup must still find
+       and kill a (already-Dead members are simply skipped, exactly like
+       sigRaiseGroup below skips them via sigRaiseInfo's own Dead/Unused
+       guard), and must still report true since a real target existed. */
+    KT_TRUE(t, threadKill(b));
+    KT_TRUE(t, threadKillGroup(pgid));
+    KT_EQ(t, threadAt(a)->state, threadDead);
+
+    KT_TRUE(t, threadReap(a));
+    KT_TRUE(t, threadReap(b));
+}
+
+/* currentThreadGetEnv/currentThreadSetEnv (sched.h's new Thread.env) always
+   act on whoever is "current" -- at KTEST time that is the idle thread
+   (id 0, same "always-present current thread" reasoning this file's own
+   header comment already gives for schedBlockCurrent above), so every test
+   below resets threadAt(0)->envCount to 0 first: idle's own table is pure
+   scratch space for these tests (initialEnv gives every REAL boot-time
+   spawn an empty table regardless of whatever idle's own happens to hold,
+   see initialEnv's own "currentIndex == 0" branch, sched.c), but leaving
+   it dirty between tests would let an earlier test's entries leak into a
+   later one's count/index assumptions. */
+KTEST(currentThreadSetEnvThenGetEnvRoundTrips)
+{
+    threadAt(0)->envCount = 0;
+
+    KT_TRUE(t, currentThreadSetEnv("FOO", "bar"));
+    KT_STREQ(t, currentThreadGetEnv("FOO"), "bar");
+    KT_NULL(t, currentThreadGetEnv("MISSING"));
+}
+
+KTEST(currentThreadSetEnvOverwritesExistingNameInPlace)
+{
+    threadAt(0)->envCount = 0;
+
+    KT_TRUE(t, currentThreadSetEnv("FOO", "bar"));
+    KT_TRUE(t, currentThreadSetEnv("FOO", "baz"));
+    KT_STREQ(t, currentThreadGetEnv("FOO"), "baz");
+    /* An overwrite must never consume a second slot. */
+    KT_EQ(t, currentThreadEnvCount(), 1);
+}
+
+KTEST(currentThreadSetEnvRejectsEntryTooLongForStorage)
+{
+    threadAt(0)->envCount = 0;
+
+    /* envEntryMax (sched.h) bounds "NAME=VALUE\0" together -- a value long
+       enough to blow that budget must be rejected outright, leaving no
+       partially-written entry behind. */
+    char hugeValue[envEntryMax];
+    for (int i = 0; i < envEntryMax - 1; i++)
+        hugeValue[i] = 'x';
+    hugeValue[envEntryMax - 1] = 0;
+
+    KT_FALSE(t, currentThreadSetEnv("FOO", hugeValue));
+    KT_NULL(t, currentThreadGetEnv("FOO"));
+    KT_EQ(t, currentThreadEnvCount(), 0);
+}
+
+KTEST(currentThreadSetEnvRejectsNewNameOnceTableIsFull)
+{
+    threadAt(0)->envCount = 0;
+
+    char name[8];
+    for (int i = 0; i < envMaxVars; i++) {
+        snprintf(name, sizeof(name), "V%d", i);
+        KT_TRUE(t, currentThreadSetEnv(name, "x"));
+    }
+    KT_EQ(t, currentThreadEnvCount(), envMaxVars);
+
+    KT_FALSE(t, currentThreadSetEnv("ONE_TOO_MANY", "x"));
+    KT_EQ(t, currentThreadEnvCount(), envMaxVars);
+
+    /* Overwriting an EXISTING name must still work even while the table is
+       completely full -- it takes the already-occupied slot, never a new
+       one. */
+    KT_TRUE(t, currentThreadSetEnv("V0", "changed"));
+    KT_STREQ(t, currentThreadGetEnv("V0"), "changed");
+    KT_EQ(t, currentThreadEnvCount(), envMaxVars);
+
+    threadAt(0)->envCount = 0;
+}
+
+KTEST(currentThreadEnvEntryExposesRawStorageForListing)
+{
+    threadAt(0)->envCount = 0;
+
+    KT_TRUE(t, currentThreadSetEnv("A", "1"));
+    KT_TRUE(t, currentThreadSetEnv("B", "2"));
+    KT_EQ(t, currentThreadEnvCount(), 2);
+    KT_STREQ(t, currentThreadEnvEntry(0), "A=1");
+    KT_STREQ(t, currentThreadEnvEntry(1), "B=2");
+    KT_NULL(t, currentThreadEnvEntry(2));
+    KT_NULL(t, currentThreadEnvEntry(-1));
+